SealSpec / Custom gaskets / Urethane foam
Microcellular urethane foam (PORON-type) gaskets
Custom-cut microcellular urethane foam (poron-type) gaskets (Polyurethane, microcellular): where it works, where it fails, typical properties, and how to call it out on a drawing. Use the builder to spec your part in this material.
Typical properties
| Polymer | Polyurethane, microcellular |
|---|---|
| Form | foam |
| Service temperature | -40 to 194 °F (typical) |
| Firmness | By density (lb/ft³) and CFD |
| Common thicknesses (in) | .020, .031, .040, .062, .093, .125, .250 |
Typical ranges for the material family. Specific grades differ: confirm on the datasheet.
Strengths
- Very low compression set for a foam
- Consistent compression force
- Thin gauges for electronics and gap filling
Watch out for
- Limited high-temperature use
- Limited hydrolysis resistance in hot, wet service; check grade
Typical applications
- Electronics and display gaskets
- Battery cell cushioning
- Dust and light seals
Specs and standards to reference
- UL 94 grades exist
- Specify by density and compression-force deflection
Chemical check: see Polyurethane ratings across 2,088 fluids →