PU foam weatherstrip is a soft polyurethane foam core, usually wrapped in a smooth PE film and sometimes fitted with a kerf fin for timber door frames. It compresses with very little force, so doors close easily, and it is economical. It suits interior doors, timber frames and low-cost retrofit kits; outdoors it ages faster than EPDM foam and loses recovery sooner (typical range about –30 °C to +80 °C).
Typical properties
| Property | PU foam |
|---|---|
| Typical service temperature | about –30 °C to +80 °C |
| Closing force | Very low – soft |
| UV / weather | Fair – best with PE film cover |
| Compression recovery | Good when new, ages faster than EPDM |
| Fixing | Self-adhesive or kerf fin |
| Relative cost | Low |
Typical ranges for general-purpose compounds, for comparison only. The exact compound, hardness and section decide the real performance – tell us your conditions and we propose a material.
Good choice for
- Interior and timber doors (kerf weatherstrip)
- V-strip for door jambs and sashes
- Retail retrofit kits
Avoid it for
- Exposed outdoor seals with strong sun
- Seals that must last many years outside (use EPDM foam)