- Appearance: Colorless liquid.
- Active oxygen content: Approximately 8.6% w/w.
- Antisensitizer: Fatty acid esters are used.
- Density (20°C): Approximately 1.01 g/cm³.
- Viscosity (20°C): Approximately 13 mPa·s.
- Solubility: Insoluble in water; miscible with esters, unsaturated polyesters, and vinyl ester resins.
- Critical temperature (SADT): Approximately 60°C.
- Cold storage stability: Remains liquid below -25°C.
- Recommended storage temperature: below 30°C.
- Shelf life at 30°C is 6 months from the date of delivery.
- Primary Use: For curing large molded parts at room temperature in conjunction with a cobalt catalyst.
- Suitable for curing unsaturated polyester resins; compatible with all types of unsaturated polyester resins and vinyl ester resins.
- Standard dosage: 1–3% of the resin weight, combined with 0.5–2% of a 1% cobalt solution (or an alternative cobalt amine catalyst).
- The “pot life” (gel time of resin + peroxide) is typically only a few hours, depending on temperature and resin type.
- The “dormancy period” (gel time of resin + peroxide + catalyst) is relatively long, particularly when curing isophthalic or terephthalic resins.
- Moderate heat release results in low internal stress.
- Recommended for vinyl ester (VE) resins.
- Relatively short demolding time, i.e., good demolding factor (fMR = tMR/tgel).
- Temperatures below 20°C and/or certain specialized resin types can significantly delay curing; it is recommended to use more reactive grades of unsaturated polyester resins (CUROX M-202, 302, 402); for VE resins, add an amine catalyst.
- Particularly suitable for hand lay-up, spray lay-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 gun by spraying MEKP into the air.
- Conduct a “cobalt cure” test at 25°C using OPA resin (20 g in a test tube).
- CUROX® M-102 is available in standard packaging sizes of 5 kg and 22.5 kg polyethylene bottles.