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.
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.
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Revision number: 1.0. Date: 03.03.14. Device M: TDS.
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MCP-75 MEKP-925 KP-9