CUROX ? CM-75R A liquid mixture of methyl ethyl ketone peroxide and tert-butyl peroxide. This is a red liquid made primarily from a mixture of peroxides based on methyl ethyl ketone peroxide and tert-butyl peroxide, essentially desensitized by phthalate plasticizers. The mixture is used as a curing agent (source of free radicals) for unsaturated polyester resins, especially vinyl ester resins. The main areas of application include vacuum impregnation and plastic bagging technology, as well as the curing of hand/sprayed reinforced parts at room temperature with cobalt or cobalt/amine accelerators, mainly for thicker laminated materials.

Technical data included:

• Appearance: red liquid
• Active Oxygen Content: Approx. 8.81 TP3T (mass fraction)
• Hydrogen peroxide content: approximately 0.7% (mass fraction)
• Water content: approx. 1.21 TP3T (mass fraction)
• Desensitizer: Dimethyl phthalate
• Density (20°C): approx. 1.1 g/cm3
• Viscosity (20°C): approx. 19 mPa-s
• Miscibility: can be mixed with alcohols and phthalates
• Critical temperature (SADT): 60°C or more
• Refrigeration stability: below -20°C
• Recommended storage temperature: 0°C to 30°C
• Maintenance of activity at 30°C: 6 months from date of manufacture

Applications include: curing agents for all UP resin types in combination with cobalt/cobalamin accelerators at room temperature. Recommended dosage levels: 1-2.51 TP3T as supplied, 0.5-21 TP3T with 11 TP3T cobalt solution.Vinylester resins have limited applicability to this. In Vinylester resins, the Cobaltoctoate/Dimethylaniline combination accelerates the reaction more strongly. For prolonged vacuum impregnation/injection, gel times of resin + peroxide + accelerator can be sufficiently achieved.

The curing performance depends on the resin type, the heat evolution is very low and a good cure rate is guaranteed in all dimensions (thin/thick layers). In unsaturated polyester resins the gel time and gel-to-peak time are much longer compared to standard MEKP (Curox M-303). Temperatures below 20°C significantly increase the curing time and therefore cobalt/amine accelerators should be used.

Processing methods include hand lay-up, spraying, fiber winding, impregnation processes, and especially RTM When using spray equipment, follow the manufacturer's instructions. Ensure that all safety devices are functioning properly and do not spray peroxide into the air.

Further information on suitable curing agents for unsaturated polyester resins is also provided and can be found in the relevant application manuals.

The standard packing specification is 25 kg polyethylene bottle. For detailed information and usage, you are advised to scrutinize and test according to your needs.