CATALYST | Revchem Composites

19MEC_TDS.pdf

Sat, 27 Sep 2025 09:47:42 +0000

Technical Data Sheet

NOROX

MEC
Methyl ethyl ketone peroxide/Cyclohexanone Peroxide
CAS#1338-23-4
12262-58-7
Liquid mixture

Description
Norox MEC is a colorless solution of methyl ethyl ketone peroxide and
cyclohexanone peroxide in phlegmatizer. Norox MEC was developed to give
excellent cure performance in low and average temperature conditions when
used as an initiator with unsaturated polyester resins.
Technical Data
Active oxygen 9.0 max
Form: Liquid
Color: Water white
Specific Gravity @ 25 C: 1.12
Viscosity @ 25 C: 18.0 cps
Flash point (SETA C.C.) 170 F / 77 C, min
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
Maintenance of activity at 30 C as from date of
delivery
6 months

Application
Norox MEC should be considered for gel and cure initiation for cobalt
promoted unsaturated polyester resins at low operating temperatures.
Norox MEC will also give good performance at normal temperatures.
Other advantages, compared to standard MEKP formulations include:

1. Shorter gel to cure time in many resins.

2. Excellent smoothness and uniformity in the cure cycle.

3. Excellent storage stability because of the absence of
impurities (water, hydrogen peroxide, unreacted methyl ethyl
ketone and other diluents).

4. Enhanced performance with gel coats. (The hydrophobic
nature of Norox MEC provides improved mixing and resin
compatibility).

Technical Data Sheet

RESIN: Ortho Laminating (pre-promoted)

Initiator Gel Peak Gel to Barcol Hardness@
Time Exotherm Cure 3 hrs. 5hrs. 24 hrs.
Norox MEKP-9 15.9 min. 328 F 71 min. 5(4) 15(4) 34(4)
Norox MEKP-925 16.2 min. 336 F 76 min. 5(4) 7(4) 32(4)
Norox MEC 14.9 min. 330 F 61 min. 6(4) 16(4) 34(4)

Results determined by United SPI laboratory test methods and are to
be used for comparison, only.

Resin suppliers should be contacted for specific recommendations for
individual resins.

Resin: Typical ISO Marble Clear Gel Coat

Initiator Level: 2.0% Resin Temp: 77 F

Initiator Gel Peak Time to 20g Tack Barcol Hardness@
Time Temp Peak Peak Free 3hrs. 5hrs. 24hrs.
Norox MEKP-9H 13.8 min. 406 F 23.9 min. 344 F 79 min. 35(D) 55(5) 15(4)

Norox MEKP-925H 13.2 min. 423 F 24.0 min. 356 F 82 min. 15(5) 70(5) 20(4)

Norox MEC 11.6 min. 394 F 21.5 min. 358 F 75 min. 20(5) 60(5) 20(4)

Technical Data Sheet

PACKAGING, SHIPPING & AVAILABILITY

Technical Data Sheet

The standard package sizes of NOROX

MEC are 4×8 lb and 44 lb
(20 kg) polyethylene bottles.
NOROX

MEC is available pre-dyed in 44 lb (20kg) bottles. Please
see United Initiators, Inc. TDS for Peroxide Dye Concentrates.
Classification Please refer to the specific NOROX

MEC Safety
Data Sheet (SDS) under section 14 & 15, shipping & regulatory
information. NOTE: SDS s for all United Initiators, Inc. products may
be requested by contacting the company.
NOROX

MEC is available through a global network. Call United
Initiators, Inc. for the name of the distributor in your area

This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw
materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or
their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability.
Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account.

Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of
verifying the suitability and applicability as to the intended purpose.

T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 12.09.14. Device M: TDS.

19CL40V-F_TDS.pdf

Sat, 27 Sep 2025 09:47:41 +0000

19CFDYE_TDS.pdf

Sat, 27 Sep 2025 09:47:41 +0000

Technical Data Sheet
Description
Technical Data
! hi i ?’iF”f’* R 5
United lnitiators Ketone Dye Goncentrates
Methyl ethyl ketone peroxide
CAS# N/A
Liquid mixture
United SPI Dye Concentrates are available for selected Norox@ ketone
peroxide products to enable the user to ensure that the peroxide cure initiator
(“catalyst”) is being uniformly mixed and applied in unsaturated polyester and
vinyl ester resins. These dye concentrates are available in permanent or
fading formulations as described below.
Active oxygen
Form:
Specific Gravity @
25″ C:
Flash point (C.O.C.):
Flash point (SETA C.C.)
SADT:
Soluble in:
Slightly soluble in:
5.6 max
Liquid
1.15
200″F/93″C, min
150″F/66’C, min.
149’F (60″C)
Oxygenated organic solvents
Water
Application
BW-4 –
Blue dye concentrate for point of use addition, only. Available only in
one-gallon package size. Non-fading in the curing system. Fairly permanent in
cured resin, but with prolonged exposure to the sun, BW-4 will fade.
B-1 –
Fading blue dye concentrate for ketone peroxide formulations. This blue
dye concentrate will begin to fade as the resin is completing gelation, to an
almost colorless state when the resin has cured. For point of use addition, only
Available only in one-gallon package size.
Y-5 –
Non-fading yellow dye for most standard, low water content ketone
peroxides. Not recommended for high water content peroxides. For point of use
addition. Available only in one-gallon package size.
R-4 –
Non-fading red dye concentrate especially suitable for high water content
ketone peroxide formulations. lt can also be used in low water content
peroxides. Available for point of use addition, or pre-added to the appropriate
peroxides at the time of manufacture.

Technical Data Sheet
i lri i’1″ 3 A’l”i-; i:; i:’
R-5 –
Non-fading red dye for most standard, low water content ketone
peroxides. Not recommended for high water content peroxides. Peroxide
products for which this is a suitable dye can be pre-dyed at the time of
manufacture or added at point of use. Available in 18 cc bottles and one-gallon
packages for point of use addition.
FR-1 –
Fading red dye concentrate for ketone peroxide product formulations.
This dye concentrate will begin to fade as the resin is completing gelation to an
almost colorless state when the resin has cured. Available for suitable pre-dyed
peroxide products and in one fluid ounce bottles and one-gallon package sizes
for point of use addition.
Warning –
These dye concentrates have been tested for performance and
stability only in United SPI peroxides. Use in other manufacturers’ products is
not recommended, and United SPI will not accept any liability for safety and/or
performance shortcomings of any concentrate used in any product not
manufactured by us. We do not recommend the use of fading dyes in gel coats
or color critical applications.
PACKAGING, SHIPPING & AVAILABILITY
The standard package sizes of NOROX@ UNITED KETONE DYE
CONCENTRATES are 4xB lb and 44lb (20 kg) polyethylene bottles.
NOROX@ UNITED KETONE DYE CONCENTRATES is available pre-
dyed in a4 lb (20k9) bottles. Please see United lnitiators, lnc. TDS for
Peroxide Dye Concentrates.
Classification –
Please refer to the specific NOROX@ UNITED
KETONE DYE CONCENTRATES Safety Data Sheet (SDS) under
section 14 &15, shipping & regulatory information. NOTE: SDS’s for
all United lnitiators, lnc. products may be requested by contacting the
company.
NOROX@ UNITED KETONE DYE CONCENTRATES is available
through a global network. Call United lnitiators, lnc. for the name of
the distributor in your area
Changes due lo technical progress and corporate advancement reserued. Any existing third-party @pyrights are to be taken inlo accounl.
verifying the suitability and applicabilily as to the intended purpose.
a
f: +49 89 74422 237
F: +49 89 74422 6237
cs-i nitiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.naft a@united-in,com
T: +86 20 613’1 1370
F: +86 1 39 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
Revision number: 1.0. Date: 03.03.14. Device M: TDS.
www,united-initiators.com

19CFDYE-G_TDS.pdf

Sat, 27 Sep 2025 09:47:40 +0000

19CDYE_TDS.pdf

Sat, 27 Sep 2025 09:47:39 +0000

19CDYE-G_TDS.pdf

Sat, 27 Sep 2025 09:47:38 +0000

19CC50_TDS.pdf

Sat, 27 Sep 2025 09:47:37 +0000

Technical Data Sheet
BENOX

C-50
Dibenzoylperoxide
CAS#94-36-0
50 % powder with phthalate
Structural Formula
Description
Benox is a white, free-flowing, granular powder consisting of 50%
dibenzoyl peroxide, phthalate ester plasticizer.This peroxide can be
used as a cure initiator for unsaturated polyester resins and acrylic
resins in both elevated temperature cure and ambient temperature
cure (in combination with amine accelerators) processes. Benox is
easy to disperse and dissolves fast in unsaturated polyester and
acrylic resins.
The system Benox C-50/Amine gives you a very fast cure that is hardly
influenced by the humidity and fillers. Even at low temperature a relatively
good cure will be obtained.
Technical Data
Peroxide Content 50 %
Active oxygen 3.30 %
Appearance White, free-flowing powder
”Kick-off” Temperature 70 C
10-hr Half-life temperature (0.1 mole in
benzene)
72 C
Critical temperature (SADT) 60 C
Recommended storage temperature Max 30 C
Soluble in Phthalates
Insoluble in Water
Maintenance of activity as from date of
delivery
6 months
Application
AMBIENT TEMPERATURE CURING
Benox is typically used in ambient temperature processes at
levels of 2% – 5%, as supplied, on weight of resin, in combination
with 1% – 3% amine accelerator (typically 10% dimethylaniline
solution in phthalate).
Caution: Do not mix Benox directly with amine accelerators
violent decomposition will occur! Thoroughly mix one with the
resin prior to adding the other.

Technical Data Sheet

Benox is characterized by relatively fast cure with moderate to high exotherms
in most resin systems, resulting in relatively short demoulding times. Possible
application: Roof covering, floorings, chemical anchors, road marking paints.
ELEVATED TEMPERATURE CURING

Benox can be used singly, or in combination with other elevated
temperature cure peroxides, in processes with operating
temperatures above 70 C (176 F). When used singly,
approximately 0.5% of amine accelerator (as described above) is
recommended for thorough cure. Omission of the accelerator
often results in only a moderate degree of cure, even after post
curing.
Benox can also be used in combination with one or more elevated
temperature cure peroxides such as peroxyesters, peroxyketals and/or
peroxydicarbonates in processes such as Pultrusion, cured-in-place-pipe, and
wet press moulding. Amine accelerators are not typically used in these
applications.

Measurements
AMBIENT TEMPERATURE CURING

(2mm laminate @23 C / 73 F)

Formulation (parts by
wt)

High Reactive Ortho
Resin
100 100 100 100 100 100
Benox 4 4 4 2 2 2
10% DMA Solution 2 1 0.5 2 1 0.5
Cure Data (minutes)
Gel Time 6 10 30 10 19 44
Mould Release Time 10 15 50 20 35 90

Cure Temperature 50 C 60 C 80 C 95 C

Formulation (parts
by wt)

High Reactive Ortho
Resin
100 100 100 100 100 100 100 100
Benox 2 2 2 2 2 2 2 2
10% DMA Solution — 0.5 — 0.5 — 0.5 — 0.5
Cure data
(minutes)

Gel Time >60 8 30 5 8 4 3 3
Mould Release Time — 10 35 7 10 5 5 4

It must be emphasized that the data above applies to only one resin. Potential
users of similar systems must evaluate their specific resin(s) prior to
production use of Benox

Technical Data Sheet

Storage
Store in original containers away from flammables and all sources of heat,
sparks, or flames; out of direct sunlight; and away from cobalt naphthenate,
anilines, other promoters, accelerators, oxidizing or reducing agents and
strong acids or bases.
Packaging
The standard package sizes of BENOX C-50 is 25 kg in a PE bag placed in
cardboard box. Weights are on a net weight basis.

Disclaimer
This information and all further technical advice are reflecting our present knowledge and experience based on internal tests with local raw materials with the purpose to inform about
our products and applications. The information should not be construed as guaranteeing specific properties of products described or their suitability for a particular application, nor as
providing complete instructions for use. The information implies no guarantee for product and shelf life properties, nor any liability or other legal responsibility on our part, including
with regard to existing third party intellectual property rights, especially patent rights. We reserve the right to make any changes according to technological progress or further
developments.
Application and usage of our products based on our technical advice is out of our control and sole responsibility of the user. The user is not released from the obligation to conduct
careful inspection and testing of incoming goods in order to verify the suitability for the intended application.
United Initiators
EU
United Initiators
Nafta
United Initiators
China
United Initiators
Australia
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 03.03.14. Device M: TDS.

19CB50W-F_TDS.pdf

Sat, 27 Sep 2025 09:47:36 +0000

Technical Data Sheet

BENOX

B-50 & B-55
Dibenzoyl Peroxide Paste
CAS# 94-36-0
Description
BENOX B-50 & B-55 are fine dispersions of dibenzoyl peroxide in a smooth,
non-separating fire resistant creamy paste form. The patented (U.S. Patent
No. 5,334,326) benzoate plasticizer diluent system provides product
formulations that can be readily dissolved in resins and monomers. These
products are less hazardous and easier to use than technical or dry forms of
dibenzoyl peroxide provided the plasticizer and water content are not
objectionable. Additional benefits of the benzoate plasticizer system include
better resistance to the dispersion of heat degradation and the elimination of
phthalate ester plasticizers.

BENOX B-50-106 Creamy, white, non-separating paste containing 50%
dibenzoyl peroxide. Primarily formulated for use with auto body filler.

BENOX B-50-210 Blue pigmented version of 50% dibenzoyl peroxide in
paste form. B50-210 is a creamy, non-separating product formulated for use
with auto body filler.

BENOX B-50-230 Lighter Blue pigmented version of 50% dibenzoyl
peroxide in paste form. B50-230 is a creamy, non-separating product
formulated for use with auto body filler. For customers that prefer a lighter blue
paste hardener.

BENOX B-50-513 Red pigmented 50% dibenzoyl peroxide paste. This
product is the most popular in the B-50 line of creamy non-separating paste
formulations.

BENOX B-50-713 Onyx pigmented 50% dibenzoyl peroxide paste. B50-713
is a creamy, non-separating product formulated for use with auto body filler.

BENOX B-55-107 A basic white, paste form of 55% dibenzoyl peroxide
formulated primarily for use in the mine bolt industry and other industries
which require a product that can be further diluted prior to use.

BENOX B-55-108 This white, paste form of 55% dibenzoyl peroxide is
formulated for use in ambient and elevated temperature curing of unsaturated
polyester resins. B-55-108 is characterized by its lower water content and
creamy non-separating form, compared to the 107 formulation.
Technical Data Benox B- 50 Benox B-55
Dibenzoyl Peroxide Content: 50 55
Active oxygen 3.3 3.6
Form: Thixotropic Cream
Color: White
Soluble in: Oxygenated & aromatic solvents
Slightly soluble in: Alcohols & petroleum solvents
Insoluble in: Chlorinated solvents

Technical Data Sheet

Application
BENOX B-50 & B-55 is principally used as polymerization initiators and curing
agents for monomeric vinyl, acrylic, styrene and unsaturated polyester/vinyl
ester resins, and copolymers of these resins, provided the plasticizer and water
content can be tolerated. This product has advantages over dry, granular
products, and include:

1. Marked reduction of hazards involved in handling and storage.
2. The homogeneous dispersion of extremely fine particles of dibenzoyl
peroxide in plasticizer dissolves more readily in resins and eliminates the
hazardous practice of dissolving dry dibenzoyl peroxide in styrene, acetone, or
other volatile solvents.

ROOM TEMPERATURE MOLDING
BENOX B-50 & B-55 can be used for room temperature curing of pre-promoted
polyester and vinyl ester resins. Dimethyl or diethyl aniline are the most
generally used, but another that can be used is N, N-dimethyl-p-toluidine. These
promoters, or accelerators, are generally used in concentrations between 0.01%
and 0.6%, on weight of resin. The B-50 & B-55 use levels can be between 0.5%
and 5.0%, depending on the desired gel and cure properties.

CAUTION: ABSOLUTE CARE MUST BE TAKEN TO PREVENT DI RECT
MIXING OF B-50 & B-55 WITH ANY OTHER PROMOTER. DOIN G SO COULD
CAUSE A VIOLENT DECOMPOSITION RESULTING IN A FIRE O R
EXPLOSION.

AUTO BODY FILLER
BENOX B-50 is used to cure auto body patching compound formulated with
unsaturated polyester resin. The creamy paste form of BENOX B-50 allows the
user to easily and uniformly mix the peroxide with the patching compound for a
rapid, uniform cure. BENOX B-50 is available in several colors which serve as
a visual guide to ensure uniform dispersion in the patching compound.
Repackaging of the peroxide in peroxide in polyethylene tubes or jars is easily
accomplished, but extreme care should be taken to avoid contamination. Use
only clean and dust-free containers for repackaging.

ELEVATED-TEMPERATURE MOLDING
BENOX B-55 is widely used in elevated in the elevated-temperature curing of
polyester compounds in heated molds. The practical operating temperatures of
BENOX B-55 initiated resin curing are between 180 F and 300 F. Processes
which can use BENOX B-55 include matched-metal molding, hot press
molding, bag molding, compression and transfer molding.

ADHESIVES
B-50 & B-55 may be used in two-part adhesive systems based on polyester or
methacrylate resins. The creamy consistency allows uniform mixing of the
components. The non-separating aspect of B-50 & B-55 allows repackaging into
smaller, more useable quantities.

Technical Data Sheet

CHEMICAL STRUCTURE

PACKAGING, SHIPPING & AVAILABILITY

The standard package sizes of BENOX B-50 & B-55 are 50 lb. and
22 kg plastic pails and 175 kg polyethylene lined, fiberboard drum,
and 55 gallon poly drum. For custom package sizes, please contact
your local distributor or United Initiators, Inc.
Classification Please refer to the specific BENOX

B-50 & B-55
Safety Data Sheet (SDS) under section 14 & 15, shipping & regulatory
information. NOTE: SDS s for all United Initiators, Inc. products may
be requested by contacting the company.
BENOX B-50 & B-55 is available through a global network. Call
United Initiators, Inc. for the name of the distributor in your area

19CA9H_TDS.pdf

Sat, 27 Sep 2025 09:47:35 +0000

TS.SP.02.15US/04.03.2019/02

Yenibosna Merkez Mah. Ladin Sok. No:36/70 Townofis
34197 Bah elievler / STANBUL / TURKEY
t. +90 212 580 5559 f. +90 212 580 5521
www.akpakimya.com e. info@akpakimya.com

AKPEROX A9H
Description : Methyl Ethyl Ketone Peroxide in 2,4,4-trimethyl-1,3-pentanediol Diisobutyrate

Specifications;

Density (@20 C) : 1,1 0,005 gr/cm
3
Appearance : Colorless, Liquid
Diluent : Mix solvents
Active Oxygen Content : 8,75 – 8,95 %
Peroxide Content : 34 – 36 %
SADT : 60 C
CAS Nr. : 1338-23-4
EINECS/ELINCS Nr : 700-954-4
REACH Reg. No : 01-2119514691-43-0007
UN No. : 3105

Application : AKPEROX A9H is a general purpose MEKP for curing unsaturated polyester (UP)
resins at room temperature.

Usage & Amount : It is recommended to use 1% – 2% in general, depending on application. Needs to
be used with Cobalt accelerators at room temperature. (E.g. AKCOBALT 1%)

Packaging : 30 Kgs Jerry Can, 5 Kgs Jerry Can, 4×5 Kg in a Carton Box.

Handling & Storage : Must be kept between +5 C and +30 C. Keep pails tightly closed. Store and
handle in a dry, well- ventilated place, away from sources of heat, ignition and
direct sunlight in original packaging. Provide grounding and venting in order to
prevent static electricity build-up. Avoid any contact with Amine and Cobalt
Accelerators, acids, alkalis and heavy metal compounds such as driers and metal
soaps. Storage Class; IIA

Shelf Life : 8 Months
For unopened packages at recommended storage conditions.

19CA9CLFR_TDS.pdf

Sat, 27 Sep 2025 09:47:33 +0000

TS.SP.02.14R1US/27.09.2022/03

Yenibosna Merkez Mah. Ladin Sok. No:36/70 Townofis
34197 Bah elievler / STANBUL / TURKEY
t. +90 212 580 5559 f. +90 212 580 5521
www.akpakimya.com e. info@akpakimya.com

AKPEROX A9CL FD
Description : Methyl Ethyl Ketone Peroxide in 2,4,4-trimethyl-1,3-pentanediol Diisobutyrate

Specifications;

Density (@20 C) : 1,14 0,005 gr/cm
3
Viscosity (@20 C) : 22-25 mPa.s
Appearance : Red, Liquid
Diluent : 2,2,4-trimethyl-1,3-pentanediol diisobutyrate
Active Oxygen Content : 8,75 – 8,95 %
Peroxide Content : 34 – 36 %
SADT : 65 C
CAS Nr. : 1338-23-4
EINECS/ELINCS Nr : 700-954-4
REACH Reg. No : 01-2119514691-43-0007
UN No. : 3105

Application : AKPEROX A9CL FD is a multipurpose catalyst for the room temperature cure of
promoted unsaturared polyester resins. The resin ca be heat-cured with AKPEROX
A9CL in a temperature range of 100-127 C.

Usage & Amount : It is recommended to use 1% – 2% in general, depending on application. Needs to be
used with Cobalt accelerators at room temperature. (E.g. AKCOBALT 1%)

Packaging : 30 Kgs Jerry Can, 5 Kgs Jerry Can, 4×5 Kg in a Carton Box.

Handling & Storage : Must be kept max at +30 C. Keep pails tightly closed. Store and handle in a dry, well-
ventilated place, away from sources of heat, ignition and direct sunlight in original
packaging. Provide grounding and venting in order to prevent static electricity build-
up. Avoid any contact with Amine and Cobalt Accelerators, acids, alkalis and heavy
metal compounds such as driers and metal soaps. Storage Class; IIA

Shelf Life : At least 12 Months
For unopened packages at recommended storage conditions.

19CA70-F_TDS.pdf

Sat, 27 Sep 2025 09:47:31 +0000

Technical Data Sheet

BENOX

A-70
Dibenzoyl Peroxide/Water wet granules
CAS# 94-36-0
Solid
Description
BENOX

A-70 is a free flowing, water-wet granular forms of dibenzoyl
peroxide. In this form, this product are less flammable and shock sensitive
than granular formulas containing little or no water. This Benox dibenzoyl
peroxide products can be used as polymerization initiators for vinyl monomers
and unsaturated polyester resins when the presence of water is not
detrimental.
Technical Data
Dibenzoyl Peroxide Content: 67-70
Water Content: 30-33
Assay: 99
Active Oxygen: 4.4-4.6
Form: Fine, free-flowing
Color: White
Iron, dry basis, max: 10 ppm
Total Chloride(as NaCI) 1500 ppm
Dry basis, max

Organic Chloride(as BzCI) 1100 ppm
Dry basis, max

Hydrogen Chorlide, dry basis: 0.04
Benzoic Acid, dry basis: 0.30
Soluble In: Organic Solvents
(water compatibility varies with solvent concentration)

Insoluble In: Water
SADT: >176 F (80 C)
Storage Temp: <80 F(27 C) Max Transport Temp: <80 F(27 C) Technical Data Sheet CHEMICAL STRUCTURE Molecular Weight 242.2 CAS No. 94-36-0 THERMAL DECOMPOSITION DATA (Half life in benzene): Temperature ( C) 60 70 80 90 100 110 Hours 43 13 4 1 0.4 0.1 Half-life data is generated by using 0.2 moles/liter of the specific peroxide dissolved in a solvent, generally benzene. The half-life of this highly diluted peroxide is the time required for decomposition of one-half of the peroxide. The rate of decomposition is directly related to the rate of generation of free radicals, and this half-life data can provide guidance in the selection of the optimum peroxide for a given application. This half-life data is specific to the solvent used and applies to thermal decomposition rather than activated decomposition. Application BENOX A-70 product can be used as free radical polymerization initiators and cross-linking agents in a wide variety of applications. The water wet dibenzoyl peroxide dissolves more rapidly than the dry form of the product. The water separates and settles to the bottom where it can be withdrawn if desired. BENOX A-70 is an effective initiator in the polymerization and co-polymerization of numerous vinyl monomers which include styrene, methyl methacrylate, acrylic esters, acrylonitrile, vinyl acetate, vinyl chloride, and ethylene. Typical use levels are 0.1% to 2.0% in bulk, solution, emulsion and suspension polymerizations that operate at temperatures from 180 F/82 C to 300 F/149 C. Dibenzoyl peroxide is also used in chemical reactions that produce styrenated and methacrylated alkyd resins and other epoxy resin esters. Other uses include drying agents for printing inks, bleaching agents, pharmaceutical preparations, organic chemical synthesis, and vulcanization of natural and synthetic rubbers. One of the more frequent uses of dibenzoyl peroxide is for the free radical initiated polymerization and cross-linking of vinyl monomer unsaturated polyester resin systems. Generally, the granular dibenzoyl peroxide is dispersed in the vinyl monomer before addition to the monomer/resin system. Dibenzoyl peroxide may be used as an elevated temperature cure initiator or ambient temperature cure initiator after addition of an amine accelerator (e.g. Technical Data Sheet dimethylaniline) to the resin system. Use levels of peroxide initiator are from 0.75% to 2.0% (dry weight basis) on the weight of resin. CAUTION: NEVER MIX PROMOTERS AND PEROXIDES DIRECTLY TOGETHER. RAPID DECOMPOSITION RESULTING IN FIRE AND/OR EXPLOSION WILL OCCUR! BENOX A-70 product is an excellent ambient temperature initiators when used in two-pot spray systems for unsaturated polyester resins. The accelerator is mixed with the resin in one side while the peroxide initiator is added to the second side. The two sides are then combined through a mixed chamber in the spray gun immediately prior to spraying. SPECIAL NOTE Users of BENOX A-70 should be aware that after packaging, the water in the product would migrate to the bottom of the package. As a result, the assay of dibenzoyl peroxide will vary from the top to the bottom of the package. Therefore, if less than a package of BENOX A-70 is to be used, the material should be well mixed before removing the required amount of the product. PACKAGING, SHIPPING & AVAILABILITY The standard package sizes of BENOX A-70 Granular Product is cases of 1x25 lb. polyethylene bag inside a fiberboard container. For custom package sizes, please contact your local distributor or United Initiators Inc. Classification Please refer to the specific BENOX A-70 Safety Data Sheet (SDS) under section 14 & 15, shipping & regulatory information. NOTE: SDS s for all United Initiators, Inc. products may be requested by contacting the company. BENOX A-70 is available through a global network. Call United Initiators, Inc. for the name of the distributor in your area. This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability. Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account. Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of verifying the suitability and applicability as to the intended purpose. T: +49 89 74422 237 F: +49 89 74422 6237 cs-initiators.eu@united-in.com T: +1 800 231 2702 F. +1 440 323 0898 cs-initiators.nafta@united-in.com T: +86 20 6131 1370 F: +86 139 2503 8952 cs-initiators.cn@united-in.com T: +61 2 9316 0046 F: +61 2 9316 0034 cs-initiators.au@united-in.com www.united-initiators.com Revision number: 2.0. Date: 05.02.2020. Device M: TDS.

19CA5R_TDS.pdf

Sat, 27 Sep 2025 09:47:30 +0000

TS.SP.02.08US/27.09.2022/03

Yenibosna Merkez Mah. Ladin Sok. No:36/70 Townofis
34197 Bah elievler / STANBUL / TURKEY
t. +90 212 580 5559 f. +90 212 580 5521
www.akpakimya.com e. info@akpakimya.com

AKPEROX A5R
Description : Methyl Ethyl Ketone Peroxide Phthalate Free Solution in special mineral solvent

Specifications;

Density (@20 C) : 1,00 0,005 gr/cm
3
Appearance : Colorless, Liquid
Diluent : 2,2,4-trimethyl-1,3-pentanediol diisobutyrate
Active Oxygen Content : 8,5 – 8,95 %
Peroxide Content : 33 – 37 %
SADT : 60 C
CAS Nr. : 1338-23-4
EINECS/ELINCS Nr : 700-954-4
REACH Reg. No : 01-2119514691-43-0007
UN No. : 3105

Application : AKPEROX A5R is a Phthalate Free type MEKP. It is used for the curing of
unsaturated polyester (UP) resins at room and high temperatures in existence of
Cobalt accelerator. Applicable to be used in general purpose applications.
Recommended to be used during production of composite materials which
directly get in contact with human body such as buttons, water tanks etc in point
of Phthalate Free specialty.

Usage & Amount : It is recommended to use 1% – 2% in general, depending on application. Needs to
be used with Cobalt accelerators at room temperature. (E.g. AKCOBALT 1%)

Packaging : 30 Kgs Jerry Can, 5 Kgs Jerry Can, 4×5 Kg in a Carton Box.

Handling & Storage : Must be kept between +5 C and +30 C. Keep pails tightly closed. Store and
handle in a dry, well-ventilated place. Keep away from sources of heat, ignition
and direct sunlight in original packaging. Provide grounding and venting in order to
prevent static electricity build-up. Avoid any contact with Amine and Cobalt
Accelerators, acids, alkalis and heavy metal compounds such as driers and metal
soaps. Storage Class; IIA

Shelf Life : At least 12 Months
For unopened packages at recommended storage conditions.

19C9H_TDS.pdf

Sat, 27 Sep 2025 09:47:27 +0000

Technical Data Sheet
NOROX

MEKP-9H
Methyl ethyl ketone peroxide
CAS#37187-22-7
Liquid mixture
Description
Norox MEKP-9H features a reduced level of hydrogen peroxide.
Norox MEKP-9H is particularly useful in critical gel coat applications. Another
area of application is in heated, continuous mixing systems for polymer
concrete and cultured marble.
Technical Data
Active oxygen 9.0% max
Form: Liquid
Specific Gravity @ 25 C: 1.11
Flash point (C.O.C.): 200 F/93 C, min
Flash point (SETA C.C.) 170 F min.
SADT: 140 F (60 C)
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
Application
Norox MEKP-9H is an excellent liquid general-purpose cure initiator for the
room temperature cure of polyester resins. In this application it imparts medium
to high exotherm characteristics to the cure. Norox MEKP-9H gives excellent
performance as a curing agent for gel coats. Resin suppliers should be
consulted for specific recommendations for individual resins. Norox MEKP-9H
is highly refined and substantially free of water, hydrogen peroxide and methyl
ethyl ketone. Compared to Norox MEKP-9, with most polyester resins Norox
MEKP-9H gives a slightly longer gel time with a similar total cure time.

Technical Data Sheet
PACKAGING, SHIPPING & AVAILABILITY
The standard package sizes of Norox MEKP-9H are cases of 4×8 lb.
/ 4×3.6 kg polyethylene bottles; and 44 lb. /20 kg hedpacks. For
custom package sizes, please contact your local distributor or United
Initiators, Inc.
Classification Please refer to the specific Norox MEKP-9H Safety
Data Sheet under section 14, Shipping Description.
Norox MEKP-9H is available through a nation-wide distributor
network. Call United Initiators Inc. for the name of the distributor in
your area.
This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw
materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or
their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability.
Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account.
Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of
verifying the suitability and applicability as to the intended purpose.
T: +49 89 74422 237
F: +49 89 74422 6237
cs-initiators.eu@united-in.com
T: +1 800 231 2702
F. +1 440 323 0898
cs-initiators.nafta@united-in.com
T: +86 20 6131 1370
F: +86 139 2503 8952
cs-initiators.cn@united-in.com
T: +61 2 9316 0046
F: +61 2 9316 0034
cs-initiators.au@united-in.com
www.united-initiators.com
Revision number: 1.0. Date: 03.03.14. Device M: TDS.

19C9HR5_TDS.pdf

Sat, 27 Sep 2025 09:47:25 +0000

19C925H_TDS.pdf

Sat, 27 Sep 2025 09:47:24 +0000

Technical Data Sheet
NOROX

MEKP-925H
Methyl ethyl ketone peroxide
CAS#1338-23-4
Liquid mixture
Description
Norox MEKP-925H is specifically formulated to reduce gas generation in
critical corrosion applications for vinyl ester resins in gel coats, barrier
coatings, and corrosion resistant structures. The low hydrogen peroxide level
in Norox MEKP-925H often requires that the resin promotion system be
modified for some resins to obtain reasonable gel times.
Technical Data
Active Oxygen: 9.0% max.
Form: Liquid
Color: Water White
Specific Gravity @ 25 C: 1.10
Flash point (C.O.C.): 200 F, min.
Flash point (SETA C.C.): 170 F, min.
Soluble in: Oxygenated organic solvents
Slightly soluble in: Water
SADT <140 F (60 C) Storage temp: <80 F(27 C) Max Transport Temp: <80 F(27 C) Application Norox MEKP-925H is a methyl ethyl ketone peroxide composition formulated to be an excellent cure initiator for both unsaturated polyester resins and vinyl ester resins. With most unsaturated polyesters it gives longer gel and gel to cure times but with a higher peak exotherm than Norox MEKP-9, particularly in thick sections. With most vinyl esters Norox MEKP-925H gives the most complete cure of any currently available MEK peroxide. Technical Data Sheet PACKAGING, SHIPPING & AVAILABILITY The standard package sizes of Norox MEKP-925H are cases of 4x8 lb. polyethylene bottles; and 40 lb. or 20 kg Hedpacks. For custom package sizes, please contact your local distributor or United Initiators, Inc. Classification Please refer to the specific Norox MEKP-925H Safety Data Sheet under section 14, Shipping Description. Norox MEKP-925H is available through a nation-wide distributor network. Call United Initiators, Inc. for the name of the distributor in your area. This information and our application-technical advice whether verbal, in writing or by way of trials reflect our present state of knowledge based on internal tests with local raw materials. Their purpose is to inform interested parties about our products and their possible application. They should not be construed as guaranteeing specific product properties or their suitability for a particular application. Furthermore, the information does not contain complete instructions for use. Nor does it constitute a guarantee as to quality and durability. Changes due to technical progress and corporate advancement reserved. Any existing third-party copyrights are to be taken into account. Application and use of our products based on our application-specific advice is beyond our control and sole responsibility of the user. The user is not released from the obligation of verifying the suitability and applicability as to the intended purpose. T: +49 89 74422 237 F: +49 89 74422 6237 cs-initiators.eu@united-in.com T: +1 800 231 2702 F. +1 440 323 0898 cs-initiators.nafta@united-in.com T: +86 20 6131 1370 F: +86 139 2503 8952 cs-initiators.cn@united-in.com T: +61 2 9316 0046 F: +61 2 9316 0034 cs-initiators.au@united-in.com www.united-initiators.com Revision number: 1.0. Date: 03.03.14. Device M: TDS.

19C80_TDS.pdf

Sat, 27 Sep 2025 09:47:23 +0000

Technical Data Sheet

NOROX

MCP
Methyl ethyl ketone peroxide; Cumenehydroperoxide
CAS#1338-23-4; 80-15-9
Liquid mixture

Description
NOROX

MCP is a solution of Methyl ethyl ketone peroxides and Cumyl
hydroperoxide in phlegmatiser.
NOROX

MCP is a liquid polymerisation initiator for the room temperature cure
of unsaturated polyester and vinyl ester resins with the following
advantages/properties:

Very low peak exotherm temperature
Longer working time (gel time) then standard MEKP
Excellent final cure both in thin and thick laminates
Low impurity levels (water, MEK, salts)
Less shrinkage and stress problems
Technical Data
Appearance Pale yellow liquid
Active oxygen 8.7 9.0 %
Density at 20 C 1.08 1.11 g/cm
3

Viscosity at 20 C 8 – 14 mPa.s
Flash point (Seta closed cup) > 65 C
Critical temperature (SADT) 60 C
Soluble in Oxygenated organic solvents
Slightly soluble in Water
Recommended storage temperature Max 30 C.
Maintenance of activity at 30 C
as from date of delivery
6 months

Application
NOROX

MCP has a flat and low exotherm curve which ends up in a good 24h
cure. This curing behaviour reduces stress, cracking and shrinkage problems
in laminates & castings. Less shrinkage also means less fibre print through of
gelcoated surfaces. The gel time and cure time is slower compared to
standard MEKP products but final cured resin hardness is often better than for
resins initiated with standard MEKP. NOROX

MCP can be used when you
want to build up thick laminates in one step, or if the laminate has big
variations in thickness, or when you have high resin loadings. Typical
applications are vacuum bag moulding of big units, filament winding of pipes &
tanks with thicker laminates or polyester concrete systems with high resin-to-
filler ratio.

Technical Data Sheet

Measurements
A reactivity test with an unsaturated polyester resin gave the
following results:

Resin: Orthophthalic polyester Temperature: 21 C
Initiator %:1.0 Accelerator % 1% (1% cobalt)

Initiator Gel
time
min
Time to
peak
min
Peak
exotherm temp
C
NOROX

MCP 37 79 28
NOROX

MCP-75 22 69 31
NOROX

KP-9 11 48 47

Reactivity of NOROX

initiators:

A reactivity test with an epoxy vinyl ester gave the following results:

Resin: Pre-accelerated epoxy vinyl ester Temperatu re: 25 C
Initiator %: 1.5

Initiator Gel time
min
Time to
Peak
min
Peak
Exotherm
temp C
Barcol
Hardness
(935) 24h
Gassing
ml
NOROX

KP-9
24 62 113

7.0
NOROX

KP-925H
18 39 128 53 0.9
NOROX

MCP
43 >233 28 60 0.5

0
5
10
15
20
25
30
35
40
45
50
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96Temperature ( C)
Time (minutes)
MCP MCP-75 KP-9

Technical Data Sheet

Standard Packaging
The standard package sizes of NOROX

MCP are 5 kg and 25 kg
polyethylene bottles.

19C75_TDS.pdf

Sat, 27 Sep 2025 09:47:22 +0000

Technical Data Sheet

NOROX

MCP-75
Methyl ethyl ketone peroxide; Cumylhydroperoxide
CAS#1338-23-4; 80-15-9
Liquid mixture

Description
NOROX

MCP-75 is a solution of Methyl ethyl ketone peroxides and
Cumyl hydroperoxide in phlegmatizer. NOROX

MCP-75 is a liquid
polymerization initiator for the room temperature cure of unsaturated
polyester and vinyl ester resins with the following
advantages/properties:

Very low peak exotherm temperature
Slower gel time than standard MEKP
Excellent final cure both in thin and thick laminates
Low impurity levels (water, MEK, salts)
Less shrinkage and stress problems
Technical Data
Appearance Pale yellow liquid
Active oxygen 8.7 9.0%
Density at 20 C 1.09 1.13 g/cm
3

Flash point (Seta closed cup) > 65 C (149 F)
Critical temperature (SADT) 60 C (140 F)
Soluble in Oxygenated organic solvents
Slightly soluble in Water
Recommended storage temperature Max 30 C.
Maintenance of activity at 30 C
as from date of delivery
6 months

Application
NOROX

MCP-75 has a flat and low exotherm curve which ends up in a good
24 hour cure. This curing behavior reduces stress, cracking and shrinkage
problems in laminates & castings. Less shrinkage also means less fibre print
through of gelcoated surfaces. The gel time and cure time is slower compared
to standard MEKP products. NOROX

MCP-75 can be used when you want to
build up thick laminates in one step, or if the laminate has big variations in
thickness, or when you have high resin loadings.Typical applications are
vacuum bag moulding of big units, filament winding of pipes and tanks with
thicker laminates or polyester concrete systems with high resin-to-filler ratio.

Technical Data Sheet

Measurements
A reactivity test with an unsaturated polyester resin gave the following
results:

Resin: Orthophthalic polyester Temperature: 21 C
Initiator %:1.0 Accelerator % 1% (1% cobalt)

Initiator Gel
time
min
Time to
peak
Min
Peak
exotherm temp
C
NOROX

MCP-75 22 69 31
NOROX

KP-9 11 48 47
NOROX

MEKP-925 15 59 43

Reactivity of NOROX

Initiators:

Standard Packaging

The standard package sizes of NOROX

MCP-75 are 5 kg (8 lb) and 25
kg (40 lb) polyethylene bottles.

0
5
10
15
20
25
30
35
40
45
50
0 4 8 121620242832364044485256606468727680848892Temperature ( C)
Time (minutes)
MCP-75 MEKP-925 KP-9

19C75A_TDS.pdf

Sat, 27 Sep 2025 09:47:20 +0000

Technical Data Sheet

NOROX

MCP-75
Methyl ethyl ketone peroxide; Cumylhydroperoxide
CAS#1338-23-4; 80-15-9
Liquid mixture

Description
NOROX

MCP-75 is a solution of Methyl ethyl ketone peroxides and
Cumyl hydroperoxide in phlegmatizer. NOROX

MCP-75 is a liquid
polymerization initiator for the room temperature cure of unsaturated
polyester and vinyl ester resins with the following
advantages/properties:

Application
NOROX

Technical Data Sheet

Measurements
A reactivity test with an unsaturated polyester resin gave the following
results:

Resin: Orthophthalic polyester Temperature: 21 C
Initiator %:1.0 Accelerator % 1% (1% cobalt)

Initiator Gel
time
min
Time to
peak
Min
Peak
exotherm temp
C
NOROX

MCP-75 22 69 31
NOROX

KP-9 11 48 47
NOROX

MEKP-925 15 59 43

Reactivity of NOROX

Initiators:

Standard Packaging

The standard package sizes of NOROX

MCP-75 are 5 kg (8 lb) and 25
kg (40 lb) polyethylene bottles.

0
5
10
15
20
25
30
35
40
45
50
0 4 8 121620242832364044485256606468727680848892Temperature ( C)
Time (minutes)
MCP-75 MEKP-925 KP-9

19C501_TDS.pdf

Sat, 27 Sep 2025 09:47:19 +0000

19C109_TDS.pdf

Sat, 27 Sep 2025 09:47:18 +0000