- Product Name: NOROX® 425 PR (tert-butyl isononanoate)
- CAS Number: 13122-18-4
- Purity: Approximately 90%
- Molecular Weight: Not provided
- Appearance: Colorless liquid
- Main Ingredient: tert-Butyl isononanoate peroxide
- Application: Used as an initiator in combination with cobalt catalysts for curing unsaturated polyester resins at elevated temperatures (60–120°C); particularly suitable for vinyl ester resins with long gel times at room temperature.
- Peroxide content: approx. 90% w/w
- Active oxygen: approx. 6.30% w/w
- Deactivator: None
- Density (20°C): approx. 0.90 g/cm³
- Viscosity (20°C): approx. 5.0 mPa·s
- Refractive index (20°C): approx. 1.431
- SADT (Critical Temperature): Above 55°C
- Refrigerated stability: Can be stored at temperatures below -25°C
- Recommended storage temperature: up to +25°C
- Storage stability (from date of delivery): 6 months
- Used as a curing agent for polyester resins; suitable for all resin types within a temperature range of 80–160°C.
- Usage: 1–2% of the resin weight.
- "Shelf life" (gel time of resin + peroxide, excluding catalyst) can be up to several weeks at room temperature, depending on the resin type.
- Sensitive to certain fillers, pigments, cobalt salts, and tertiary aromatic amines.
- Adding 0.1–0.3% of an inhibitor (BHT, phthalocyanine) can significantly extend shelf life.
- Used in hot-press molding and other forming processes for unsaturated polyester resins.
- Standard packaging is 25 kg.
- The information and technical recommendations provided are based on internal testing of local raw materials and are intended to introduce the product and its applications.
- The information does not guarantee any specific performance or suitability of the product, nor does it provide complete instructions for use.
- The information does not guarantee the product’s specific performance or shelf life characteristics, nor does it assume legal liability for intellectual property or other matters.
- We reserve the right to make any changes based on technical progress or further development.
- Product applications and usage based on technical recommendations are beyond our control and are the sole responsibility of the user.