Catalyst (Medium) Activity x 25kg
50% MEKP Catalyst for Polyester resins & gelcoats
Medium activity catalyst 25kg
Also available in 100g, 500g, 1kg & 5kg
High & Low activity as well as BPO type of catalyst are available upon request.
CUROX M-303 a colourless, mobile liquid, consisting of peroxides based on methylethylketone,
essentially desensitised with phtalate plasticiser. This ketone peroxide is used
as an initiator (radical source) in the curing of unsaturated polyester resins.
Main application: Hand lay-up, spray-up, continuous laminating, centrifugal
casting, filament winding and polyester concrete.
Appearance Colourless liquid
Active oxygen Approx 9.7 % w/w
Free hydrogenperoxide content Approx. 2.5 % w/w
Water content Approx. 1.8 % w/w
De-sensitising agent Dimethylphthalate
Density at 20°C Approx. 1.12 g/cm3
Viscosity at 20°C Approx. 22 mPa.s
Miscibility Miscible with alcohols, phthalates
Critical temperature (SADT) Above 60°C
Cold storage stability Below -20°C
Recommended storage temperature 0 to 30°C
Maintenance of activity at 25°C
as from date of production: 12 months
POLYESTER CURING: Curing agent for all UP resin types at ambient temperature
in combination with cobalt accelerators. Standard dosage level: 1-3% as
supplied, with 0.5-2% of a 1% cobalt solution.
“Pot life” (gel time of resin + peroxide + accelerator) relatively short compared to
standard MEKP’s, but may be prolonged by adding Inhibitor TC-510.
CURING PERFORMANCE: Moderate evolution of heat. Relatively short mould
release time. Higher reactivity in the MEKP-product range.Temperatures below
20°C prolong curing times considerably, alternatively cobalt / amine accelerators
should then be used.
PROCESSING METHODS: Particularly hand lay-up, spray lay-up, centrifugal
casting, filament winding, casting of resins, limited for gelcoats.
Technical Data Sheet
SPRAY EQUIPMENT: Use spray equipment in accordance with manufacturer’s
instructions. Ensure all safety devices are operational. Do not clear gun by
spraying MEKP into the air.