Polyurethanes (PUR) are highly desirable polymers for their ruggedness, durability and flexibility, but also for their ability to be foamed. PUR provides stability and long life, superior dielectric properties, and are resistant to high temperatures and moisture. Polyurethanes are used in manufacturing a broad range of products across multiple applications including marine, automotive, military, industrial and communications.
Polyurethane is a highly flammable material and while a flame retardant version is available (7R Option), it comes at the sacrifice of strength and surface finish. Polyurethane has poor electrical properties, which make it more suitable for use as a final jacket.
Performance of Polyurethane (PUR) for Wire and Cable Insulation and Jacketing
| Category | Rating |
|---|---|
| Temperature Range | -55°C to 125°C |
| Flame Resistance | Poor |
| Chemical Resistance | Excellent |
| Durability | Excellent |
| Flexibility | Excellent |
| UV Resistance | Good |
Polyurethane is not recommended as an insulator. It is mostly suitable for final cable jacketing.