- CUROX® M-202 is a colorless liquid consisting of a mixture of methyl ethyl ketone peroxides, using desensitized aliphatic esters. This methyl ethyl ketone peroxide is primarily used as an initiator (radical source) in the curing of unsaturated polyester resins.It is primarily used to cure molded parts at room temperature in conjunction with cobalt accelerators.
- Appearance: Colorless liquid
- Active Oxygen: Approximately 9.1% (mass percentage)
- Deactivator: Aliphatic ester
- Density (20°C): Approximately 1.01 g/cm³
- Viscosity (20°C): Approximately 16 mPa·s
- Miscible with esters, unsaturated polyester, and vinyl ester resins, but not with water
- Critical temperature (SADT): Approximately 60°C
- Low-temperature storage stability: Remains liquid below -25°C
- Recommended storage temperature: Below 30°C
- Shelf life at temperatures below 30°C is 6 months from the date of delivery
- A curing agent for unsaturated polyester resins, used in combination with cobalt accelerators at room temperature. Particularly suitable for phthalate- and isophthalate-based resins.
- Standard dosage: 1–3% of the resin weight, combined with 0.5–2% of a 1% cobalt solution.
- The "working time" (gel time of resin + peroxide) is typically only a few hours, depending on temperature and resin type.
- The “working time” (gel time of resin + peroxide + catalyst) is relatively short but can be extended by adding the inhibitor TC-510. Consequently, the mold release factor (fMR = tMR/tgel) can be significantly improved.
- Moderate heat generation. Relatively long demolding time and moderate mold release factor. Temperatures below 20°C significantly prolong curing time; alternatively, cobalt/amine accelerators may be used.
- Particularly suitable for hand lay-up, spray-up, centrifugal casting, fiber winding, resin casting, and surface coatings (fillers, fillers, gel coats, and topcoats).
- Use spray equipment in accordance with the manufacturer’s instructions. Ensure that all safety devices are functioning properly. Do not clean the spray tip by spraying MEKP into the air.
- Active: Use OPA resin (20 g) at 25°C for “DIN 16945 cobalt curing.”
- Formulation (parts by weight): Medium-reactivity resin type (OPA) 100, CUROX® M-202 2, Accelerator C-101 2.
- Curing Data: Gel time t gel [min] 2.0, maximum curing time t max [min] 14.5, peak temperature T max [°C] 141.
- Curox® M-202 is available in standard 5-kilogram and 22.5-kilogram polyethylene bottles.
- This information and all further technical recommendations reflect our current knowledge and experience based on internal testing using local raw materials and are intended to provide information about our products and their applications. This information should not be construed as a warranty regarding the specific properties of the described products or their suitability for specific applications, nor does it constitute complete instructions for use.This information does not constitute a warranty regarding the product’s characteristics or shelf life, nor does it impose any legal or other liability on us, including liability related to existing third-party intellectual property rights, particularly patent rights.We reserve the right to make any changes based on technical progress or further developments. The use and application of our products based on our technical recommendations are beyond our control and are entirely the responsibility of the user. The user is not relieved of the obligation to conduct careful inspections and tests to verify the suitability of the goods received for the intended application.