Technical Data Sheet
NOROX
MCP
Methyl ethyl ketone peroxide; Cumenehydroperoxide
CAS#1338-23-4; 80-15-9
Liquid mixture
Description
NOROX
MCP is a solution of Methyl ethyl ketone peroxides and Cumyl
hydroperoxide in phlegmatiser.
NOROX
MCP is a liquid polymerisation initiator for the room temperature cure
of unsaturated polyester and vinyl ester resins with the following
advantages/properties:
Very low peak exotherm temperature
Longer working time (gel time) then 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 1.08 1.11 g/cm
3
Viscosity at 20 C 8 – 14 mPa.s
Flash point (Seta closed cup) > 65 C
Critical temperature (SADT) 60 C
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 has a flat and low exotherm curve which ends up in a good 24h
cure. This curing behaviour 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 but final cured resin hardness is often better than for
resins initiated with standard MEKP. NOROX
MCP 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 &
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 37 79 28
NOROX
MCP-75 22 69 31
NOROX
KP-9 11 48 47
Reactivity of NOROX
initiators:
A reactivity test with an epoxy vinyl ester gave the following results:
Resin: Pre-accelerated epoxy vinyl ester Temperatu re: 25 C
Initiator %: 1.5
Initiator Gel time
min
Time to
Peak
min
Peak
Exotherm
temp C
Barcol
Hardness
(935) 24h
Gassing
ml
NOROX
KP-9
24 62 113
60
7.0
NOROX
KP-925H
18 39 128 53 0.9
NOROX
MCP
43 >233 28 60 0.5
0
5
10
15
20
25
30
35
40
45
50
0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96Temperature ( C)
Time (minutes)
MCP MCP-75 KP-9
Technical Data Sheet
Standard Packaging
The standard package sizes of NOROX
MCP are 5 kg and 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.
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Revision number: 1.0. Date: 03.03.14. Device M: TDS.