Technical Data Sheet
NOROX
CHP
Cumenehydroperoxide
CAS#80-15-9
Liquid mixture
Description
NOROX
CHP is a colourless to pale yellow liquid solution of cumene
hydroperoxide. It is an economical free-radical initiator for unsaturated
polyester resins, vinyl monomers and styrenation of oils and alkyds. NOROX
CHP may be used singly or in combination with other peroxides in both
ambient and elevated temperature processes.
Technical Data
Appearance
Pale Yellow to Colourless liquid
Active oxygen 8.7 %
Cumene hydroperoxide 80-85 %
Flash point (Seta C.C.): > 72 C
Density at 20 C 1.05 g/cm
3
Soluble in : Alcohols, ketones, esters,
hydrocarbons
Slightly soluble in: Water
Critical temperature (SADT) 75 C
Recommended storage temperature Below 30 C.
Maintenance of activity at 30 C as
from date of delivery 6 months
Application
NOROX
CHP is especially suitable for the cure initiation of unsaturated
polyester resin systems at both ambient and elevated temperatures. The
typical exotherm curve exhibited is usually mild and flat leading to a gradual,
but thorough, cure. This characteristic can minimise crazing and cracking
especially in thick cross-sections. NOROX
CHP is normally used in pre-
promoted resin systems employing cobalt and/or manganese compounds as
the primary accelerators.
CAUTION: NOROX CHP SHOULD NE VER BE MIXED WITH ACIDS OR
DIRECTLY WITH PROMOTERS OR ACCELERATORS. A VIOLENT
DECOMPOSITION CAN OCCUR WHICH MAY RESULT IN A FIRE AND/OR
EXPLOSION.
Primarily, NOROX
CHP is used in combination with higher exotherm
producing peroxides when the normal operating temperature is under 82 C.
Technical Data Sheet
These combinations will result in lower peak exotherms with the exact
magnitude determined by the blend ratio. The use of NOROX
CHP in the
blend will lengthen the cure time but should not diminish the ultimate cure.
When operating at temperatures over 82 C, NOROX
CHP can behave
similar to high exotherm peroxide. Over 121 C, use of NOROX
CHP can give
exotherms exceeding those normally expected for dibenzoyl peroxide or
methyl ethyl ketone peroxide.
Measurements
Resin: Epoxy Vinylester resin* Temperature: 25 C
Initiator %: 1.5 Accelerator %: 0.10 % (12 % Cobalt) + 0.05 % DMA
Initiator Gel
time
Min
Time
to peak
min
Peak Exotherm
Temp C
935 Hardness
2 hr 3 hr 4 hr
934
Hardness
24 hr
NOROX
CHP
56 >236 28 0 0 0 7
NOROX
CHM-50
16 61 92 41 50 55 14
NOROX
MEKP-
925H
18 41 128 10 30 32 5
* Results determined by United Initiators laboratory test methods and are used
for comparison, only. Resin suppliers should be contacted for specific
recommendations for individual resins.
Packaging
The standard package size of NOROX
CHP is 25 kg polyethylene bottles.
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
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Nafta
United Initiators
China
United Initiators
Australia
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F: +49 89 74422 6237
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www.united-initiators.com
Revision number: 1.0. Date: 27.11.17. Device M: TDS.