Rogers Corporation — Slow-Recovery Sealing Foam
Poron Microcellular Urethane
Poron is a microcellular urethane foam manufactured by Rogers Corporation that outperforms standard polyurethane foam in one critical area: compression set. Where conventional PU foam loses sealing force within months, Poron maintains consistent gasket pressure over the full equipment lifetime, typically less than 10% compression set in the standard ASTM D3574 test (1 000 hours at 70 °C, 50% deflection). Continuous service ranges to +90 °C. We stock Poron sheet in standard and extra-soft densities, with adhesive-backed options for peel-and-stick assembly.
At a Glance
Temperature Range
-40 °C to +90 °C continuous; intermittent to +121 °C
Thickness Range
0.5 mm to 12.7 mm
Available Forms
Colours
Brands We Stock
Technical Properties
Typical values across stocked grades. Specific grade data sheets available on request.
Physical Characteristics
Density
192–480 kg/m³ (grade dependent)
Tensile Strength
0.3–1.4 MPa (ASTM D3574 Test E)
Elongation at Break
100–300% (ASTM D3574 Test E)
Compression Set
< 10% (1 000 h, 70 °C, 50% deflection per ASTM D3574)
Chemical Resistance
Resistant To
- Water and aqueous cleaning solutions
- Isopropyl alcohol (IPA) for brief wipe contact
- Mild detergents
- Most common household chemicals
Limited Resistance
- Mineral oils (light splash only, not prolonged immersion)
- Ethanol and methanol (brief contact acceptable)
Not Recommended
- Petroleum solvents (petrol, toluene, xylene)
- Ketones (acetone, MEK)
- Strong acids and alkalis
- Chlorinated solvents
- Continuous hot water immersion above 50 °C
Standards & Certifications
Standards Compliance
Common Applications
- Electronics enclosure gaskets (IP54–IP67 sealing)
- Mobile phone and tablet speaker seals
- Display bezel and lens gaskets
- LED luminaire sealing
- Medical device cushioning and sealing
- Automotive sensor and ECU enclosure gaskets
- Telecommunications cabinet seals
- Hard disk drive vibration dampening
- Battery pack sealing and cushioning
- HVAC controller and thermostat gaskets
Not Recommended For
- Continuous service is limited to 90 °C (intermittent +121 °C). Not suited to high-temperature enclosure sealing above this range — specify silicone foam for sustained higher-temperature service
- More expensive than standard PU sponge or neoprene foam; cost is justified only when long-term sealing consistency matters
- Limited chemical resistance to solvents and hydrocarbons (not a chemical seal)
- Relatively low tensile and tear strength compared to solid rubber; handles compression, not tension
- Adhesive-backed variants require clean, dry bonding surfaces for reliable peel strength
- Branded product from Rogers Corporation. Lead times may apply for non-standard thicknesses and densities
Available Grades
Brands we stock: Rogers Corporation (Poron)
Poron 4701-xx Standard Density
The workhorse Poron grade for environmental sealing and cushioning in electronics and industrial enclosures. Available in multiple thicknesses and firmness levels. Very low compression set maintains sealing force over the full product lifetime.
Poron 4790-92 Extra Soft
Ultra-low-density microcellular urethane for applications requiring minimal closure force: thin bezels, lightweight enclosures, and medical devices where low clamping pressure is available. Maintains the same low compression set as standard Poron grades.
Poron, Adhesive-Backed
Standard or extra-soft Poron supplied with pressure-sensitive acrylic adhesive on one side for peel-and-stick gasket assembly. Adhesive is pre-applied and protected by a release liner. Reduces assembly time and eliminates the need for liquid adhesives or mechanical retention.
Need Poron Microcellular Urethane?
We supply poron microcellular urethane in sheet, roll, and custom die-cut forms. Contact our team for pricing, data sheets, or technical assistance.
Disclaimer
This resource is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.