- CUROX® M-312 is a colorless liquid consisting of a mixture of peroxides based on methyl ethyl ketone peroxide, primarily deactivated by fatty acid esters. This peroxide serves as a free-radical initiator for the curing of unsaturated polyester resins at room temperature in combination with a cobalt accelerator.
- It is suitable for curing molded parts at room temperature when used in combination with cobalt accelerators.
- It is particularly suitable for specific types of pre-accelerated and stabilized resins.
- Appearance: Colorless liquid
- Deactivator: Fatty acid esters
- Active Oxygen (AO): approx. 8.6–9.2% (mass percentage)
- Hydrogen peroxide content: approx. 2.6% (mass percentage)
- Density (20°C): Approx. 1.01 g/cm³
- Viscosity (20°C): approx. 13 mPa·s
- Refractive index (20°C): approx. 1.431
- Flash point: approx. 57°C
- Critical temperature (SADT): approx. 60°C
- Refrigerated stability: approx. -25°C
- Recommended storage temperature: below 30°C
- Storage stability from date of delivery: 6 months
- Standard packaging: 5 kg and 22.5 kg HDPE drums
- Suitable for curing all unsaturated polyester resins at room temperature in combination with cobalt accelerators. 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 “pot life” (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 TC-510 inhibitor. This significantly improves the mold release factor (fMR = tMR/tgel).
- Moderate heat release, long mold release time, and moderate mold release factor.
- Temperatures below 20°C significantly prolong the 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).
- Spray Equipment: Use spray equipment in accordance with the manufacturer’s instructions. Ensure that all safety devices are functioning properly. Do not spray MEKP into the air to clean the spray gun.
- Decomposition products that may be detected: methyl ethyl ketone, acetic acid
- Avoid heat sources, light, and moisture, and protect the product from contaminants. Keep within the safe temperature range.
- This information and any further technical advice provided reflect United Initiators’ current knowledge and experience regarding its products and applications, based on its internal research and development.United Initiators makes no warranties regarding the information provided, including specific descriptions of product characteristics, their suitability for particular applications, or complete instructions for use. Furthermore, United Initiators makes no warranties regarding product characteristics or shelf life and assumes no legal liability for the use of the information provided.United Initiators reserves the right to make any changes based on technical advancements or further developments. The use of our products based on our technical recommendations is beyond our control and is strictly at the user’s own risk. Users are not relieved of their obligation to carefully inspect and test the products upon receipt to verify their suitability for the intended application.