1. Introduction: Ripoxy CP-819EX is a bisphenol A-type vinyl ester resin that offers excellent adhesion to concrete and good workability.
2. Features
- Excellent chemical resistance
- Good adhesion to concrete
- More suitable for dry and high-moisture concrete compared to epoxy and polyurethane primers
- 100% reactive
3. Liquid Properties
- Appearance: Light brown liquid
- Specific gravity: 1.02
- Acid value: 1–8 (mg KOH/g)
- Shelf Life: 60 minutes or more
- Viscosity: 0.01–0.04 Pa·s at 25°C
4. Operating Conditions
- Weather: Above 5°C, humidity not exceeding 85%, no dew
- Substrate Preparation: Free of water; remove any efflorescence from the concrete surface
- Tools: Brush, roller, or sprayer
- Curing time: 3–10 hours
- Recoating Interval: Once the surface no longer feels tacky—within 7 days
5. Shelf Life: 90 days (below 20°C, in a dark place)
6. Curing Properties
- RIPOXY CP-819EX
- Curing agent: 50% benzoyl peroxide
- Accelerators: Cobalt octoate (8% metal) and dimethylaniline
Temperature/Mixing Ratio/BPO%/C%/DMA%/Gel Time (minutes)
- 20°C/6.0/3.6/0.4/35–45
- 30°C/4.0/3.6/0.4/50–60
- 35°C/4.0/3.6/0.4/35–45
- 50°C/3.1/36/0.4/50–60