PORON® 4701-60 Very Firm (Unsupported)
PORON® 4701-60 is a very firm, unsupported cellular polyurethane foam available in three density grades — 240 (15), 320 (20), and 400 (25) kg/m³ (lb/ft³) — with compression force deflection values of 231 (34), 538 (78), and 783 (114) kPa (psi) respectively at 25% deflection per ISO 6916-1. It delivers the highest compression force deflection in the PORON® 4701 series, with compression set maximums of 7.9%, 6.9%, and 4.7% at 70°C (158°F) for the three density grades. Recommended constant use temperature is 90°C (194°F), with intermittent use up to 121°C (250°F).
Key Properties
- Compression Force Deflection, kPa (psi): 231 (34) / 538 (78) / 783 (114) at 240 / 320 / 400 kg/m³; ISO 6916-1; 30mm/min, 25% deflection
- Compression Set, % max @ 70°C (158°F): 7.9 / 6.9 / 4.7 at 240 / 320 / 400 kg/m³; ISO 1856 Test A
- Dimensional Stability, % max — 22 hrs @ 80°C forced-air oven: ± 5
- Hardness, Shore A: 30 / 42 / 53 at 240 / 320 / 400 kg/m³ (Shore O 42 / 55 / 63); ASTM D2240, per Rogers data sheet 17-018
- Outgassing (ASTM E595-93): TML 0.6 / 0.7 / 0.7%, CVCM 0.05 / 0.02 / 0.03%, WVR 0.5 / 0.5 / 0.6% at 240 / 320 / 400 kg/m³; per Rogers data sheet 17-018
- Density: 240 kg/m³ (15 lb/ft³), 320 kg/m³ (20 lb/ft³), 400 kg/m³ (25 lb/ft³); ASTM D3574-95, Test A (± 10% all grades)
- Dielectric Strength, kV/mm: 2.3 / 2.5 / 2.2 at 240 / 320 / 400 kg/m³; IEC 243-1
- Recommended Constant Use Temperature (Max.): 90°C (194°F)
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Physical Properties
| Property | Value | Test Method |
| Color (Code) | Black (04) | — |
| Density Tolerance | ± 10% (all grades) | ASTM D3574-95, Test A |
| Available Thicknesses, mm (inches) — 240 kg/m³ | 0.79 (0.031), 1.57 (0.062), 2.36 (0.093), 3.18 (0.125), 4.78 (0.188), 6.35 (0.250) | — |
| Available Thicknesses, mm (inches) — 320 kg/m³ | 0.79 (0.031), 1.57 (0.062), 3.18 (0.125), 4.78 (0.188) | — |
| Available Thicknesses, mm (inches) — 400 kg/m³ | 1.57 (0.062), 4.78 (0.188) | — |
| Thickness Tolerance | ± 10% | — |
| Compression Force Deflection, kPa (psi) | 231 (34) / 538 (78) / 783 (114) at 240 / 320 / 400 kg/m³ | ISO 6916-1; 30mm/min, 25% deflection |
| Compression Set, % max @ 70°C (158°F) | 7.9 / 6.9 / 4.7 at 240 / 320 / 400 kg/m³ | ISO 1856 Test A |
| Dimensional Stability, % max — 22 hrs @ 80°C forced-air oven | ± 5 | — |
Electrical Properties
| Property | Value | Test Method |
| Dielectric Strength, kV/mm | 2.3 / 2.5 / 2.2 at 240 / 320 / 400 kg/m³ | IEC 243-1 |
| Volume Resistivity, ohm·cm | 1.67 × 10¹³ / 1.15 × 10¹⁵ / 8.78 × 10¹³ at 240 / 320 / 400 kg/m³ | IEC 60093 |
| Surface Resistivity, ohm/sq | 1.56 × 10¹⁵ / 2.05 × 10¹⁵ / 1.39 × 10¹⁵ at 240 / 320 / 400 kg/m³ | IEC 60093 |
Thermal Properties
| Property | Value | Test Method |
| Recommended Constant Use Temperature (Max.) | 90°C (194°F) | — |
| Recommended Intermittent Use Temperature (Max.) | 121°C (250°F) | UL 157 |
| Embrittlement Temperature | -40°C (-40°F) | ISO 974 (E) |
Flame & Fire Performance
| Property | Value | Test Method |
| UL 94 HBF — Min. Thickness Passed, mm (in) | 3.18 (0.125) / 1.57 (0.062) / 1.57 (0.062) at 240 / 320 / 400 kg/m³ | UL 94 HBF (File E20305) |
| FMVSS 302 — Min. Thickness Passed, mm (in) | 3.18 (0.125) / 1.57 (0.062) at 240 / 320 kg/m³ | ISO 3795 / DIN 75200 |
| FMVSS 302 — Max. Burn Rate, mm/min | 54 / 68 / 70 at 240 / 320 / 400 kg/m³ | ISO 3795 / DIN 75200 |
| UL Gasketing & Sealing | Pass | UL JMST2 (File MH15464) |
| Fogging | Pass (240 and 320 kg/m³) | ISO 6452 / DIN 75201 |
Hardness & Outgassing (Rogers data sheet 17-018)
| Property | Value | Test Method |
| Hardness, Durometer Shore O | 42 / 55 / 63 at 240 / 320 / 400 kg/m³ | ASTM D2240 |
| Hardness, Shore A | 30 / 42 / 53 at 240 / 320 / 400 kg/m³ | ASTM D2240 |
| Outgassing — Total Mass Loss (TML), % | 0.6 / 0.7 / 0.7 at 240 / 320 / 400 kg/m³ | ASTM E595-93, 24 hrs @ 125°C (257°F), <7 × 10³ kPa |
| Outgassing — Collected Volatile Condensable Materials (CVCM), % | 0.05 / 0.02 / 0.03 at 240 / 320 / 400 kg/m³ | ASTM E595-93 |
| Outgassing — Water Vapor Regain (WVR), % | 0.5 / 0.5 / 0.6 at 240 / 320 / 400 kg/m³ | ASTM E595-93 |
Hardness and outgassing values are typical values from Rogers Corporation data sheet 17-018 for PORON® 4701-60 and are not on the summary TDS above. All three density grades fall inside the TML ≤1.00% and CVCM ≤0.10% limits used for spacecraft material screening; Rogers notes that typical values should not be used as specification limits.
Compliance
- UL 94 HBF — Compliant (File E20305)
- FMVSS 302 — Compliant (ISO 3795 / DIN 75200)
- UL Gasketing & Sealing — Compliant (UL JMST2, File MH15464)
- ASTM E595 low-outgassing screening (TML ≤1.00%, CVCM ≤0.10%) — All three density grades within limits, per Rogers typical data
- Very firm seals and gaskets for high-load industrial and electronics enclosure sealing
- High-load EMI and environmental sealing in automotive interior assemblies
- Demanding gasketing applications where high compressive resistance and low compression set are required
- Industrial and electronics assembly components requiring the highest firmness in the PORON® 4701 series
- Automotive interior applications requiring FMVSS 302 flame compliance
Common industries: automotive, electronics, industrial manufacturing.
PORON® 4701-60 is the highest-firmness grade in the PORON® 4701 unsupported cellular polyurethane foam series. It is designed for demanding sealing and gasketing applications where high compressive loads are expected and where the foam must maintain its sealing force without permanent deformation. Three density grades provide compression force deflection values spanning 231 to 783 kPa (34 to 114 psi) at 25% deflection, allowing designers to select the appropriate resistance level for their load requirements.
The unsupported construction provides maximum flexibility for die-cutting and converting into finished gasket and seal geometries. Compression set performance at 70°C (158°F) is 7.9% or less, depending on density grade, indicating good long-term sealing retention under thermal load. Dielectric strength ranges from 2.2 to 2.5 kV/mm across the three density grades. The material passes fogging per ISO 6452 / DIN 75201 for the 240 and 320 kg/m³ grades, and embrittlement does not occur above -40°C (-40°F).
Compliant with UL 94 HBF (File E20305), FMVSS 302 (ISO 3795 / DIN 75200), and UL Gasketing & Sealing JMST2 (File MH15464).
What differentiates PORON® 4701-60 from other grades in the PORON® 4701 series?
PORON® 4701-60 provides the highest compression force deflection in the PORON® 4701 series — up to 783 kPa (114 psi) at 25% deflection for the 400 kg/m³ grade — making it the appropriate choice when design loads exceed what softer 4701 grades can accommodate while maintaining an effective seal.
Why is compression set critical for a foam sealing material?
Compression set measures how much a foam permanently deforms after being held under load at elevated temperature. PORON® 4701-60 has a maximum compression set of 7.9% (240 kg/m³ grade) down to 4.7% (400 kg/m³ grade) at 70°C (158°F), meaning the material retains most of its original thickness and continues to exert sealing force over the life of the assembly.
What is the service temperature range for PORON® 4701-60?
The recommended constant use temperature is 90°C (194°F) maximum, with intermittent use rated to 121°C (250°F) per UL 157. Embrittlement temperature is -40°C (-40°F) per ISO 974 (E).
Is PORON® 4701-60 suitable for automotive flame-rated environments?
Yes. PORON® 4701-60 is compliant with FMVSS 302 (ISO 3795 / DIN 75200) for the 240 and 320 kg/m³ density grades at minimum thicknesses of 3.18 mm (0.125 in) and 1.57 mm (0.062 in) respectively. It also carries UL 94 HBF compliance (File E20305) and UL Gasketing & Sealing approval under JMST2 (File MH15464).
How should PORON® 4701-60 be specified?
Specify grade (PORON® 4701-60), density (240, 320, or 400 kg/m³), thickness, compliance requirements, dimensional tolerances, and finished format.
