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
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: 24.07.14. Device M: TDS.