Distributed in the Interest
of Product Development
VANDERBILT
Chemicals Technical Data
VAROX® DBPH Liquid
Peroxide Accelerator
CH 3
CH 3
CH 3
CH 3
CH 3
C
C
C
C
OO
CH 3
Chemical Name:
Peroxide Class:
CAS No:
Molar Mass:
Properties:
CH 2 CH 2
CH 3
OO
CH 3
CH 3
CH 3
2,5-dimethyl-2,5-di(t-butylperoxy)hexane
Dialkyl
78-63-7
290.5 g/mol
Liquid, technically pure
Description
Colorless liquid consisting of technically pure 2,5-dimethyl-2,5-di-(t-butylperoxy) hexane.
This dialkyl peroxide is used as an initiator (radical source) in the crosslinking of
polymers, and in the rheology control of polypropylene.
Product Data
Property
Value
Appearance
Purity (GC)*
Active Oxygen % (calculated)*
Desensitizing agent
Density at 20ºC
Viscosity at 20ºC
Refractive Index at 20ºC
Color Index (Hazen)
Vapor Pressure at 50 /80 /110ºC
Miscibility
Colorless liquid
93-95%
10.25 – 10.47% w/w
None
0.87 g/cm3
7 mPa·s
1.422
50-80
8 / 27 / 95 mbar
Not miscible with water
Miscible with alcohols, esters
120 / 142 / 190ºC
Approximately 90ºC
Freezing point below 10ºC
10 to 30ºC
6 months
methane; acetone; tert butyl alcohol; tert
amyl alcohol; ethane; 2,5-dihydroxy-2,5dimethylhexane
isobutene; isobutene oxide; ethane;
2-methyl-3-butyn-2-ol; 2-butanone;
methyl vinyl ketone;
2,5-hexanedione
Half Life: 10hr / 1 hr / 1 min (0.1 benzene)
Critical Temperature (SADT)
Cold Storage Stability
Recommended Storage Temperature
Storage Stability from date of delivery
Major Decomposition Products (hyp)
Minor Decomposition Products (hyp)
* Certified Property
Vanderbilt Chemicals, LLC, 30 Winfield Street, P.O. Box 5150, Norwalk, CT 06856-5150
Telephone: (203) 853-1400 - Fax: (203) 838-6368 - Web Site: vanderbiltchemicals.com
Before using, read, understand and comply with the information and precautions in the Safety Data Sheets, label and other product literature. The information
presented herein, while not guaranteed, was prepared by technical personnel and, to the best of our knowledge and belief, is true and accurate as of the date
hereof. No warranty, representation or guarantee, express or implied, is made regarding accuracy, performance, stability, reliability or use. This information is not
intended to be all-inclusive, because the manner and conditions of use, handling, storage and other factors may involve other or additional safety or performance
considerations. The user is responsible for determining the suitability of any material for a specificpur pose and for adopting such safety precautions as may be
required. Vanderbilt Chemicals, LLC does not warrant the results to be obtained in using any material, and disclaims all liability with respect to the use, handling or
further processing of any such material. No suggestion for use is intended as, and nothing herein shall be construed as, a recommendation to infringe any existing
patent, trademark or copyright or to violate any federal, state or local law or regulation.
Suggested Peroxide Dosage: Crosslinking of Polymers
The table below represents typical starting peroxide loading levels for various polymer
systems. These levels should only be used as guidelines, since various compounding
ingredients have different effects on the peroxide crosslinking mechanism.
Suggested Peroxide Dosage Levels (parts per hundred rubber)
Peroxide
Polymer
VAROX®
DCP
Peroxide
Accelerator
VAROX
DCP40C,
KE or
MB
6.0 14.0
VAROX
VC-R
VAROX
80240C,
KE or
MB
VAROX
DBPH
Liquid
VAROX
DBPH50
VAROX
230XL
VAROX
231XL
1.5 2.4
3.8 - 6.0
2.5 4.0
5.6 8.9
3.5 6.5
7.5 14.0
CPE
2.4 - 3.8
CR
0.8 - 1.6
2.0 - 4.0
0.5 1.0
1.3 - 2.5
0.5 1.4
1.0 3.0
1.1 3.5
0.5 2.0
EPDM &
EPM
2.4 - 5.4
6.0 14.0
1.6 3.2
4.0 - 8.0
1.7 3.4
3.8 7.6
7.5 13.0
3.5 6.5
EVA
1.2 - 2.0
-
0.8 1.6
-
1.0 1.2
2.0 5.0
3.5 6.5
4.0 5.8
HDPE
-
-
-
-
0.5 1.2
-
-
-
HNBR
2.2 - 4.2
5.5 10.5
1.4 2.4
3.4 - 6.1
2.5 4.7
5.5 10.5
7.5 13.0
3.5 6.5
LDPE
1.5 - 2.5
-
1.2 1.8
-
1.4 2.0
-
-
-
NBR
0.9 - 1.7
2.3 - 4.3
0.5 1.5
1.3 - 3.8
1.1 2.0
2.4 4.4
3.0 5.5
2.5 5.0
NR & IR
0.8 - 1.6
2.0 - 4.0
0.5 1.0
1.3 - 2.5
0.8 1.6
2.0 4.0
2.5 5.0
2.2 4.3
SBR
0.7 - 1.5
1.7 - 3.7
0.4 1.0
1.0 - 2.5
0.7 1.2
1.6 2.7
2.0 4.5
1.8 4.0
Q
0.5 - 2.0
1.2 - 5.0
0.2 1.0
0.5 - 2.5
0.4 1.5
0.9 2.0
-
-
Other Applications: Rheology Control of Polypropylene
•
•
•
A radical source to control the rheology of polypropylene
Temperature range: 200-220ºC
Use level: 0.01 – 0.1% w/w of product as supplied, based on polymer
The degradation of polypropylene, e.g., in an extruder, lowers the mean molecular
weight and permits easier reprocessing of the polypropylene. The melt-flow index of the
controlled rheology material increases with the peroxide level.
Viscosity Breaking Efficiency
Influence of peroxide level on melt-flow index (MFI) of a commercial unstabilized
polypropylene type
% w/w use level (as
MFI [g/10 min] at 190ºC / 2.16kg
supplied)
VAROX DBPHVAROX 802-40PP
VAROX® DBPH
Liquid
7.5PP
Peroxide Accelerator
0.00
0.01
0.05
0.10
0.50
1.00
13
26
70
105
500
-
13
19
25
53
70
13
19
35
120
180
FDA Compliance: Peroxides in Indirect Food Additives
VAROX® DBPH Liquid complies with the following FDA regulations covering polymers,
resins, paper products, coatings or adhesives intended for food packaging or foodcontact applications:
F
Commercial
Names
21 CFR (FDA)
Limitations1
§177.1520(b)
For use as an initiator in the production of propylene homopolymer
complying with §177.1520(c), Item 1.1 and olefin copolymers complying
with §177.1520(c), Items 3.1 and 3.2 and containing not less than 75
weight percent of polymer units derived from propylene, provided that
the maximum concentration of tert-butyl alcohol in the polymer does not
exceed 100 parts per million, as determined by an FDA method titled
“Determination of tert-Butyl Alcohol in Polypropylene.”
§177.2600I(4)(ii)(b)
For use as a vulcanization accelerator in rubber articles for repeated
contact with food; total vulcanization accelerators not to exceed 1.5
percent by weight of rubber product.
®
VAROX DBPH
1
The limitations listed in this summary are those applied by the regulation to the specific organic peroxide. Some regulations impose
additional limitations on finished products, such as the maximum quantity of material that may be extracted. Please consult the
individual regulations for further information.
2
Benzoyl peroxide that meets the appropriate Food Chemicals Codex specifications has also been affirmed as generally recognized
as safe (GRAS) for use as a bleaching agent in certain foods (i.e., flour, whey and milk used in the production of certain cheeses). See
21 C.F.R. §184.1157
3
Section 175.105 requires food packaging adhesives produced from the substances listed in the regulation to be separated from food
by a functional barrier. Alternatively, the quantity of adhesive contacting packaged aqueous and fatty foods must not exceed the trace
amounts at seams and at the edge exposure between packaging laminates that may occur within the limits of good manufacturing
practice; the quantity of adhesive that contacts packaged dry food must not exceed the limits of good manufacturing practice.
4
Limits of addition expressed as percent by weight of finished resin.
Additional information and technical data sheets are available at:
vanderbiltchemicals.com
For additional information please consult the Material Safety Data Sheet.
VAROX is a registered trademark of R.T. Vanderbilt Holding Company, Inc. or its respective wholly owned
subsidiaries.
rev/10/24/2013