PORON® 4701-15 SoftSeal
PORON 4701-15 is an ultra-soft cellular polyurethane foam from the Soft Seal Series, cast directly onto a 0.05 mm (2 mil) clear polyester (PET) film creating a permanent bond. The material delivers 2.00 kPa (0.29 psi) typical compression force deflection at 25% and a density of 104 kg/m³ (6.5 lb/ft³), with a compression set of 0.53% maximum and thermal conductivity of 0.06 W/m·K. Designed for sealing, gasketing, and cushioning at very low compression force.
Key Properties
- Compression Force Deflection — Typical: 2.00 kPa (0.29 psi) @ 25% deflection (ASTM D3574-95)
- Compression Force Deflection — Range: 2.41–4.62 kPa (0.35–0.67 psi) (ASTM D3574-95)
- Compression Set, % max: 0.53 (0.021) @ 70°C (158°F) (ASTM D3574-95 Test D)
- Density: 104 kg/m³ (6.5 lb/ft³) (ASTM D3574-95, Test A)
- Thermal Conductivity: 0.06 W/m·K (Rogers Internal Method)
- Thickness: 0.75 mm (0.030″) ± 0.10 mm (0.004″)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties — PORON® Foam
| Property | Value | Test Method |
| Color (Code) | Black (04) | — |
| Density | 104 kg/m³ (6.5 lb/ft³) | ASTM D3574-95, Test A |
| Density Tolerance | ± 1.00 kg/m³ (± 0.039 lb/ft³) | ASTM D3574-95, Test A |
| Thickness | 0.75 mm (0.030″) | — |
| Thickness Tolerance | ± 0.10 mm (± 0.004″) | — |
| Compression Force Deflection — Typical | 2.00 kPa (0.29 psi) | ASTM D3574-95; 0.51 cm/min, 25% deflection |
| Compression Force Deflection — Min | 2.41 kPa (0.35 psi) | ASTM D3574-95; 0.51 cm/min, 25% deflection |
| Compression Force Deflection — Max | 4.62 kPa (0.67 psi) | ASTM D3574-95; 0.51 cm/min, 25% deflection |
| Compression Set, % max | 0.53 (0.021″) | ASTM D3574-95 Test D @ 70°C (158°F) |
| Thermal Conductivity | 0.06 W/m·K | Rogers Internal Method |
Supporting Material — Clear Polyester Film (PET) 0.05 mm (2 mil)
| Property | Value | Test Method |
| Density | 1395 kg/m³ (87.1 lb/ft³) | ASTM D1505 |
| Tensile Strength — MD | 3.5 × 10⁶ kPa (500,000 psi) | ASTM D882 |
| Modulus — MD | 2.1 × 10⁵ kPa (30,000 psi) | ASTM D882 |
| Yield Strength (F5) — MD | 1.0 × 10⁵ kPa (15,000 psi) | ASTM D882 |
| Ultimate Elongation | 150% | ASTM D882 |
| Coefficient of Friction A/B (Kinetic) | 0.40 | ASTM D1894 |
| Shrinkage — MD, % (TD) | 1.2 (0.0) | 39 min @ 150°C (302°F) |
- Soft seals and gaskets requiring very low compression force
- EMI / environmental sealing
- Cushioning and vibration damping
- Electronics assembly
- Compression sealing at low pressure
Common industries: electronics, automotive, and EMI / environmental sealing.
PORON 4701-15 is an ultra-soft, highly conformable cellular polyurethane foam from the PORON Soft Seal Series, positioned as the lightest-density grade in the line at 104 kg/m³ (6.5 lb/ft³). The material is cast directly onto a 0.05 mm (2 mil) clear polyester (PET) film, creating a permanent foam-to-film bond that provides easy handling while preserving the foam’s ultra-soft, conformable character.
The supported construction is designed for sealing, gasketing, and cushioning applications requiring a soft, conformable material with very low compression force deflection, including EMI / environmental sealing and compression sealing at low pressure.
Foam physical performance includes a typical CFD of 2.00 kPa (0.29 psi) at 25% deflection — with min 2.41 kPa (0.35 psi) and max 4.62 kPa (0.67 psi) — and a compression set maximum of 0.53 (0.021) at 70°C (158°F). Thermal conductivity is 0.06 W/m·K.
The 0.05 mm (2 mil) clear PET supporting film delivers 1395 kg/m³ (87.1 lb/ft³) density, 3.5 × 10⁶ kPa (500,000 psi) tensile strength MD, 2.1 × 10⁵ kPa (30,000 psi) modulus MD, 1.0 × 10⁵ kPa (15,000 psi) yield strength MD, 150% ultimate elongation, 0.40 kinetic coefficient of friction, and 1.2% MD shrinkage (0.0% TD) at 39 min @ 150°C (302°F).
What differentiates PORON 4701-15 from other PORON Soft Seal grades such as 4701-30, 4701-40, or 4701-41?
4701-15 is the lightest density in the Soft Seal Series at 104 kg/m³ (6.5 lb/ft³), with the lowest typical CFD (2.00 kPa / 0.29 psi at 25%) in the family and the thinnest standard build (0.75 mm). It is cast onto a 0.05 mm PET film for handling support. It is selected when ultra-low compression force is the primary requirement — more so than the firmer 4701-30, which is cast on the same film at higher density (320–400 kg/m³) and CFD (34 kPa typical).
Why is compression set critical for this material?
Compression set measures the foam's ability to recover its original thickness after sustained compression. For seals and gaskets, a low compression set means the foam continues to fill the gap and seal against dust, moisture, and EMI over the service life of the assembly. PORON 4701-15 delivers a compression set maximum of 0.53 (0.021") at 70°C (158°F) per ASTM D3574-95 Test D, reflecting the exceptional recovery characteristic of PORON microcellular polyurethane.
What is the operating temperature range for PORON 4701-15?
The TDS does not specify a service temperature range for this grade. Contact H-O Products for application guidance.
Is PORON 4701-15 suitable for electronics or EMI sealing environments?
Yes. The material is designed for EMI / environmental sealing and electronics assembly, with the PET film support providing easy handling and die-cut precision. No specific compliance standards are listed on the TDS for this grade.
How should PORON 4701-15 be specified?
Specify grade (PORON 4701-15), thickness (0.75 mm), color (Black, Code 04), support (0.05 mm clear PET film), compression force deflection range (2.41–4.62 kPa at 25%), dimensional tolerances, and finished format (die-cut, kiss-cut, slit roll, or sheet).
