Halogenated Flame Retardant UPR (HET Acid)
Key Features
- Reactive halogen flame retardancy — permanent, non-leachable
- Meets UL 94 V-0 and BS 476 Class 1 at adequate thickness
- Suitable for hand lay-up and spray-up processes
- Can be blended with ATH for enhanced smoke suppression
- Compatible with standard MEKP/cobalt cure systems
Halogenated Flame Retardant UPR is formulated with HET acid (chlorendic acid, hexachloroendomethylenetetrahydrophthalic acid) as a reactive flame retardant comonomer incorporated directly into the polyester backbone. This approach provides permanent, non-leachable flame retardancy that does not affect the physical properties of the cured resin as adversely as additive-type flame retardants.
The chlorine content (typically 20-25% by weight of the cured resin) provides effective gas-phase and solid-phase flame inhibition, enabling compliance with UL 94 V-0 (at adequate thickness), BS 476 Part 7 Class 1, and similar fire rating standards. Oxygen Index (LOI) of neat cured castings is 28-32%.
Viscosity at 25°C is 400-800 mPa·s. Cured mechanical properties: flexural strength 80-95 MPa, tensile strength 50-60 MPa. Properties are somewhat reduced versus unfilled UPR due to the high chlorine content plasticizing effect. ATH filler addition (30-40 phr) can further enhance fire performance and improve smoke density. Suitable for transportation, construction, electrical, and mass transit applications requiring FRP fire performance certification.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Pale yellow to amber liquid |
| Density (25°C) | 1.18-1.22 g/cm³ |
| Viscosity (25°C) | 400-800 mPa·s |
| LOI (neat casting) | 28-32% |
| Chlorine Content (cured) | 20-25% |
| Flexural Strength (cured) | 80-95 MPa |
| Gel Time (25°C, 1.5% MEKP) | 15-25 min |
Applications
FAQ
With proper laminate construction (glass fiber content 25-30%, laminate thickness ≥3 mm), UL 94 V-0, BS 476 Part 7 Class 1, and DIN 4102 B1 ratings are achievable. Adding 30-40 phr ATH filler improves smoke density (reduces NBS smoke chamber values). For mass transit applications, EN 45545 certification typically requires additional testing.
Direct Contact
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