Clear UL94 V-0 flame retardant PU resin targets the LED market
While traditionally, flame retardancy has been achieved by adding solid fillers or halogenated liquid flame retardants, Electrolube’s UR5641 does not contain any fillers and is halogen free. Conventional resins that claim to be flame retardant and optically clear are actually a pale amber when cured. Many of these resins are most likely to be based on epoxy technology which is prone to yellowing. Instead, the UR5641 is based upon aliphatic urethane chemistry, which is naturally resistant to the yellowing effects of natural light, making it useful for both exterior as well as interior applications. The UR5641 cures to provide a flexible, protective and aesthetically pleasing covering over the luminaire elements. The resin also offers high resistance to weather, acids and alkalis, water and mould growth. The two-part, semi-rigid, optically clear, flame retardant polyurethane resin meets the UL94 V-0 standard. It is extremely durable and can be used for a wide variety of applications including the protection of LED luminaires exposed to hazardous atmospheres, such as emergency lighting, or lighting intended for installation in ATEX rated/zoned environments.
The UR5641 resin demonstrates high dielectric strength at 11 kV/mm, a thermal conductivity of 0.35 W/m.K and provides a wide operating temperature range between -40 to +120°C. The RoHS-2 compliant resin also provides a cure time within 24 hours at 23°C or 4 hours at 60°C.
Electrolube – www.electrolube.com
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