PORON® 4701-40V0
PORON® 4701-40V0 is an extra-soft, highly compressible intumescent polyurethane foam with a density of 176 kg/m³ (11 lb/ft³), rated UL94 V-0, FMVSS 302, and CSA Comp V-0 at a minimum passing thickness of 2.7 mm (0.106 in). Compression force deflection range is 3.4–17.2 kPa (0.5–2.5 psi) at 25% deflection, with a typical value of 10.3 kPa (1.5 psi). Supplied on a removable release PET film in thicknesses from 3.00 to 10.00 mm (0.118–0.394 in).
Key Properties
- Compression Force Deflection, kPa (psi) — Range: 3.4–17.2 (0.5–2.5); 0.51 cm/min (0.2″/min) Strain Rate, Force @ 25% Deflection
- Compression Force Deflection, kPa (psi) — Typical: 10.3 (1.5); 0.51 cm/min (0.2″/min) Strain Rate, Force @ 25% Deflection
- Tensile Strength, kPa (psi) — min.: 41.4 (6); ASTM D3574-75, Test E
- Compression Set, % max. @ 23°C (73°F): 5; ASTM D1667-90, Test D
- Density, kg/m³ (lb/ft³): 176 (11); ASTM D3574-95, Test A
- Recommended Constant Use Temperature (Max.): 90°C (194°F); SAE J-2236
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Density, kg/m³ (lb/ft³) | 176 (11) | ASTM D3574-95, Test A |
| Thickness, mm (inches) | 3.00–10.00 (0.118–0.394) | — |
| Thickness Tolerance, % | ± 10 | — |
| Density Tolerance, % | -9% / +5% | — |
| Standard Color (Code) | Black (04) | — |
| Support Type | Release PET | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection, kPa (psi) — Range | 3.4–17.2 (0.5–2.5) | 0.51 cm/min (0.2″/min) Strain Rate, Force @ 25% Deflection |
| Compression Force Deflection, kPa (psi) — Typical | 10.3 (1.5) | 0.51 cm/min (0.2″/min) Strain Rate, Force @ 25% Deflection |
| Compression Set, % max. @ 23°C (73°F) | 5 | ASTM D1667-90, Test D |
| Compression Set, % max. @ 70°C (158°F) | 10 | ASTM D3574-95, Test D |
| Dimensional Stability, % max. change | ± 1 | 22 hrs @ 80°C (176°F) in a Forced-Air Oven |
| Hardness, Durometer Shore OO | 32 | ASTM D2240-97 |
| Hardness, Durometer Shore A | 2 | ASTM D2240-97 |
| Tensile Strength, kPa (psi) — min. | 41.4 (6) | ASTM D3574-75, Test E |
| Tensile Strength, kPa (psi) — Typical | 152 (22) | ASTM D3574-75, Test E |
| Tensile Elongation, % — min. | 80 | ASTM D3574-75, Test E |
| Tensile Elongation, % — Typical | 150 | ASTM D3574-75, Test E |
| Tear Strength, kN/m (pli) — min. | 0.2 (1) | ASTM D264-91 Die C |
| Tear Strength, kN/m (pli) — Typical | 0.7 (4) | ASTM D264-91 Die C |
Electrical Properties
| Property | Value | Test Method |
| Volume Resistivity, ohm-cm (ohm-in) | 6 × 10¹² (2.36 × 10¹²) | ASTM D257-99 |
| Surface Resistivity, ohm/sq | 5.25 × 10¹³ | ASTM D257-99 |
Thermal Properties
| Property | Value | Test Method |
| Recommended Constant Use, max. | 90°C (194°F) | SAE J-2236 |
| Recommended Intermittent Use, max. | 121°C (250°F) | — |
| Embrittlement | -4°C (-20°F) | GMW 18067 |
| Cold Flexibility | -4°C (-20°F) | MIL-P-12420D 1991 @ -20°C (-4°F) |
Flame & Fire Performance
| Property | Value | Test Method |
| Flammability (Pass ≥), mm (inches) | 2.7 (0.106) | UL94 V-0 (File E20305) |
| Flammability (Pass ≥), mm (inches) | 2.7 (0.106) | FMVSS 302 |
| Flammability (Pass ≥), mm (inches) | 2.7 (0.106) | CSA Comp V0 (File E20305) |
| Flame, Smoke, Toxicity | HL3, HL2, HL1 | EN 45545-2:2020, R22 |
| Flame, Smoke, Toxicity | HL3, HL2, HL1 | EN 45545-2:2020, R23 |
| Fogging | Pass | SAE J-1756, 3 hrs @ 100°C (212°F) |
Outgassing
| Property | Value | Test Method |
| Outgassing, Total Mass Loss (TML) % | 1.07 | ASTM E595-93, 24 hrs @ 125°C (257°F) @ <7 kPa (1.02 psi) |
| Outgassing, Water Vapor Regain (WVR) % | 0.7 | ASTM E595-93 |
Compliance
- UL94 V-0 — Compliant (File E20305; Pass ≥ 2.7 mm / 0.106 in)
- FMVSS 302 — Compliant (Pass ≥ 2.7 mm / 0.106 in)
- CSA Comp V0 — Compliant (File E20305; Pass ≥ 2.7 mm / 0.106 in)
- EN 45545-2:2020, R22 — Compliant (HL3, HL2, HL1)
- EN 45545-2:2020, R23 — Compliant (HL3, HL2, HL1)
- Flame-retardant sealing in automotive interior assemblies requiring UL94 V-0 and FMVSS 302 compliance at low closure force
- Mass transit and rail vehicle sealing compliant with EN 45545-2:2020 R22 and R23 at HL1 through HL3
- Electronic enclosure gaskets requiring V-0 rated foam with extra-soft compressibility
- Low-closure-force seals and cushioning in applications where intumescent behavior is required under fire conditions
- Outgassing-sensitive environments requiring a fogging-tested, low TML foam
Common industries: automotive, mass transit and rail, electronics, industrial manufacturing.
PORON® 4701-40V0 is an extra-soft, highly compressible intumescent polyurethane foam designed for applications requiring low compression force combined with stringent flame retardant performance. With a density of 176 kg/m³ (11 lb/ft³) and a CFD range of 3.4–17.2 kPa (0.5–2.5 psi) at 25% deflection, it accommodates low-closure-force sealing designs in automotive interiors, mass transit, and electronic enclosures.
The material is supplied on a removable release PET film in thicknesses from 3.00 to 10.00 mm (0.118–0.394 in), with a thickness tolerance of ± 10% and density tolerance of -9% / +5%.
Mechanical properties include a hardness of 32 Shore OO and 2 Shore A, minimum tensile strength of 41.4 kPa (6 psi) with a typical of 152 kPa (22 psi), and minimum tensile elongation of 80% with a typical of 150%. Tear strength minimum is 0.2 kN/m (1 pli), with a typical of 0.7 kN/m (4 pli). Volume resistivity is 6 × 10¹² ohm-cm (2.36 × 10¹²) and surface resistivity is 5.25 × 10¹³ ohm/sq.
The material passes the SAE J-1756 fogging test (3 hrs @ 100°C / 212°F) and dimensional stability is ± 1% maximum after 22 hrs @ 80°C in a forced-air oven. Cold flexibility passes at -4°C (-20°F) per MIL-P-12420D 1991.
Compliant with UL94 V-0 (File E20305) at ≥ 2.7 mm (0.106 in), FMVSS 302 at ≥ 2.7 mm (0.106 in), CSA Comp V0 (File E20305) at ≥ 2.7 mm (0.106 in), and EN 45545-2:2020 R22 and R23 at HL3, HL2, and HL1.
What differentiates PORON® 4701-40V0 from other extra-soft PORON® grades?
PORON® 4701-40V0 is the only PORON® grade combining extra-soft compressibility (CFD range 3.4–17.2 kPa at 25% deflection) with a UL94 V-0 intumescent flame rating and EN 45545-2:2020 R22 and R23 compliance at HL1 through HL3, making it suited for applications where both low closure force and the highest level of flame, smoke, and toxicity performance are required simultaneously.
Why is compression set critical for this material?
In low-closure-force sealing applications — where the foam must seal under minimal compressive load — compression set determines whether the material permanently deforms under that load and loses contact pressure over time. PORON® 4701-40V0 limits compression set to 5% maximum at 23°C (73°F) and 10% maximum at 70°C (158°F), ensuring long-term sealing performance even under very low applied loads.
What is the service temperature range for PORON® 4701-40V0?
Recommended constant use temperature is 90°C (194°F) maximum per SAE J-2236, with intermittent use to 121°C (250°F). Embrittlement temperature is -4°C (-20°F) per GMW 18067, and cold flexibility passes at -4°C (-20°F) per MIL-P-12420D 1991.
Is PORON® 4701-40V0 suitable for mass transit and automotive flame-rated environments?
Yes. PORON® 4701-40V0 is compliant with UL94 V-0 (File E20305), FMVSS 302, and CSA Comp V0 (File E20305) at a minimum passing thickness of 2.7 mm (0.106 in). It is also compliant with EN 45545-2:2020 R22 and R23 at HL1, HL2, and HL3, covering mass transit and rail vehicle applications at all hazard levels.
How should PORON® 4701-40V0 be specified?
Specify grade (PORON® 4701-40V0), thickness, compliance requirements (UL94 V-0, FMVSS 302, CSA Comp V0, EN 45545-2:2020), dimensional tolerances, and finished format.
