Polyisocyanate Hardener R820
Model: R820
Size: 0.8kg/can
Polyisocyanate hardener with excellent yellowing resistance and moderate crystallization efficiency. Designed for use with solvent-based PU adhesives. Enhances tensile strength, heat resistance, and hydrolysis resistance of bonded joints.
Key Features
- Excellent yellowing resistance
- Moderate crystallization efficiency
- Enhances tensile strength
- Improves heat and hydrolysis resistance
Specifications
| Solid Content | 25.0±2.0% |
|---|---|
| NCO Content | 4.5±1.5% |
| Packaging | 0.8kg/can |
Related questions
What hardener ratio should I use with two-component PU adhesive?
Typical polyisocyanate hardener ratio is 5–6% by weight of the main glue for water-based PU (e.g. Marichemix 610 + R768 at 5–6%), and 3–5% for solvent-based PU. Always follow the specific product TDS — over-dosing causes brittleness and yellowing; under-dosing causes weak crosslinking and heat-resistance failure. Mixed glue should be used within the recommended pot life (commonly 4–8 hours) and not topped up after that window.
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