Poron · grade · default condition
Poron Standard
Properties of the Standard condition, compared with the other Poron grades.
Default choice for gasket sealing, screen and battery cushioning where low closure force and high conformability matter.
What is Poron Standard?
Poron Standard is Poron in the Standard grade — default choice for gasket sealing, screen and battery cushioning where low closure force and high conformability matter. Poron Standard has a tensile strength of 1 MPa (0.145 ksi), weaker than 85% of polymer grades. Elongation at break is 170% and the elastic modulus is 0 GPa (2.18×10⁻⁴ Msi). Poron Standard has a density of 0.32 g/cm³ (0.0116 lb/in³), lighter than 84% of polymer grades. Its glass-transition temperature is -35°C (-31 °F).
Advantages
- Forms and bends easily — 90/100, better than 92% of polymer grades
- Lightweight — 0.32 g/cm³ (0.0116 lb/in³), better than 84% of polymer grades
- Easy to machine — 80/100, better than 83% of polymer grades
Limitations
- Absorbs moisture — dry before molding — 3%, worse than 99% of polymer grades
- Low stiffness — 0 GPa (2.18×10⁻⁴ Msi), worse than 97% of polymer grades
- Poor heat conductor — 0.06 W/m·K (0.0347 BTU/hr·ft·°F), worse than 84% of polymer grades
- Needs corrosion protection — 70/100, worse than 80% of polymer grades
Poron Standard properties
Typical room-temperature values for Poron Standard — 8 properties are specific to this condition; the rest are grade-level values shared by every Poron grade. Each bar shows where the value sits among the polymer grades in FabDigit's library — further right is higher.
Physical3
Poron Standard has a density of 0.32 g/cm³ (0.0116 lb/in³), lighter than 84% of polymer grades. Its glass-transition temperature is -35°C (-31 °F).
Mechanical9
Poron Standard has a tensile strength of 1 MPa (0.145 ksi), weaker than 85% of polymer grades. Elongation at break is 170% and the elastic modulus is 0 GPa (2.18×10⁻⁴ Msi).
Thermal6
Poron Standard is rated for continuous service to 90°C (194 °F). It conducts heat at 0.06 W/m·K (0.0347 BTU/hr·ft·°F), worse than 84% of polymer grades.
Electrical2
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 80% of polymer grades. UV resistance is fair.
Sustainability3
Producing a kilogram of Poron Standard takes about 100 MJ of energy and emits 5 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 0%.
Manufacturability2
Poron Standard's machinability is very good (80/100, better than 83% of polymer grades); formability excellent (90/100).
Common Calculations3
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Poron grades and fills
Poron is also supplied in 7 other conditions. The full side-by-side table is on the Poron overview.
- StandardDefaultDefault choice for gasket sealing, screen and battery cushioning where low closure force and high conformability matter.1 MPa tensile
- FirmPick when the pad must carry higher load or resist thinning under sustained clamp force, e.g. structural standoff and vibration pads.2 MPa tensile
Working with Poron Standard
Is Poron easy to machine?
Convert by steel-rule die, rotary kiss-cut, laser (with fume extraction) or waterjet; avoid conventional milling — the foam tears and compresses under tool load.
Can Poron be welded?
Not weldable; join with acrylic PSA transfer tape, urethane adhesive or mechanical capture in a housing groove.
Can Poron be formed, bent or molded?
Supplied as cast/skived sheet and roll; forms only by compression in the assembly — design for 20–50 % working deflection and avoid >70 % compression to preserve recovery.
What surface finishes work on Poron?
No coating needed; surfaces are as-skived or film/PSA laminated, and can be printed or laminated with PET/PI films for low-friction or shielding layers.
Poron chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| polyester/polyether polyolsoft-segment backbone; ether-type used for hydrolysis-resistant grades | 50 – 70 | 60 |
| diisocyanate (MDI/TDI)hard-segment / crosslinker | 20 – 40 | 30 |
| cell-control additives, surfactants, pigmicrocellular structure control | 2 – 10 | 5 |
| flame retardant (FR grades only)present only in UL 94 V-0 variants | 0 – 15 | 8 |
Poron Standard — frequently asked
What is Poron Standard used for?
Poron Standard is typically used for electronic enclosure sealing gaskets, vibration and shock dampers, display and touchscreen cushions, wearable device skin-contact padding, impact padding in protective gear and battery pack compression pads. In short: cushioning microcellular urethane.
What is the tensile strength of Poron Standard?
Poron Standard has a typical tensile strength of 1 MPa (0.145 ksi) — weaker than 85% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is Poron Standard easy to machine?
Yes — machinability is rated very good (80/100, better than 83% of polymer grades). Convert by steel-rule die, rotary kiss-cut, laser (with fume extraction) or waterjet; avoid conventional milling — the foam tears and compresses under tool load.
Can Poron Standard be welded?
Not weldable; join with acrylic PSA transfer tape, urethane adhesive or mechanical capture in a housing groove.
What surface finishes work on Poron Standard?
No coating needed; surfaces are as-skived or film/PSA laminated, and can be printed or laminated with PET/PI films for low-friction or shielding layers.
Can Poron Standard be formed, bent or molded?
Supplied as cast/skived sheet and roll; forms only by compression in the assembly — design for 20–50 % working deflection and avoid >70 % compression to preserve recovery.
What is the maximum service temperature of Poron Standard?
Poron Standard is rated for continuous use to about 90°C (194 °F), and briefly to 120°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in Poron Standard?
Yes — Poron Standard is available for sheet metal and injection molding with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- PORON Microcellular Urethane Product Data (4701 / 4790 series, AquaPro, XRD) — Rogers Corporation (2023)
- ASTM D1056 — Flexible Cellular Materials, Sponge or Expanded Rubber — ASTM (2020)
- ASTM D3574 — Flexible Cellular Materials, Slab, Bonded and Molded Urethane Foams — ASTM (2017)
- UL 94 — Tests for Flammability of Plastic Materials — UL (2020)
- Polyurethane Handbook (structure–property data for microcellular elastomers) — Hanser (1994)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.