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separates and settles to the bottom where it can be withdrawn if desired.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.
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T: +86 20 6131 1370
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T: +61 2 9316 0046
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www.united-initiators.com
Revision number: 2.0. Date: 05.02.2020. Device M: TDS.