Circalok 6403 A BLK/B urethane encapsulant is a general purpose, two-component urethane designed for applications requiring a fast cure, mechanical shock-resistant system. Circalok 6403 A BLK/B urethane encapsulant does not contain MOCA or TDI.

Features and Benefits:
• Low Viscosity – maintains low viscosity for complete and void-free encapsulation.
• Environmentally Resistant – provides excellent protection and resistance to moisture; exhibits excellent hydrolytic stability.
• Electrically Insulative – provides excellent electrical insulation properties.
• Broad Temperature Range – can be used on parts and devices that experience operating temperatures from -50°C to +120°C.

Shelf Life/Storage:
Shelf life of each component is six months when stored at 25-40°C in original, unopened container.
If stored or shipped at cooler temperatures, Circalok 6403 B hardener may crystallize. If crystals appear, gently warm hardener at 50-60°C to melt crystals before mixing with resin.