RE41E Foam
RE41E is a soft, closed-cell EPDM and Neoprene blend foam with a compression deflection of 2–5 psi at 25% per ASTM D1056 and a density of 4–8 lb/ft³, available in four thicknesses from 1/16″ to 1/4″. The material has a service temperature range of -40°F to 200°F, passes FMVSS-302 at .098″ or thicker, and is classified ASTM D1056 2A1 and ASTM D6576 Type II A, B, C Soft. It is designed for ease of compression in garage door, tonneau cover, HVAC/duct, and exterior mailbox sealing applications.
Key Properties
- Compression Deflection @ 25%: 2–5 psi (ASTM D1056)
- Tensile Strength: 75 psi (ASTM D412)
- Elongation: 125% (ASTM D412)
- Compression Set 50% (Max): 40% (ASTM D1056)
- Density: 4–8 lb/ft³ (ASTM D1056)
- Service Temperature: -40°F to 200°F
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 1/16″, 1/8″, 3/16″, 1/4″ | — |
| Color | Black | — |
| Polymer | Ethylene Propylene Diene Monomer (EPDM) | — |
| Density | 4–8 lb/ft³ | ASTM D1056 |
| Thermal Conductivity | .322 btu/(h·ft²·°F) | ASTM C518 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 2–5 psi | ASTM D1056 |
| Compression Set 50% (Max) | 40% | ASTM D1056 |
| Water Absorption (Max) | 10% | ASTM D1056 |
| Compression Deflection Change After Oven Aging (Max) | 30% | ASTM D1056 |
| Tensile Strength | 75 psi | ASTM D412 |
| Elongation | 125% | ASTM D412 |
| Tear Strength | 9.6 lb/in | ASTM D624 |
| Resilience | 35% | ASTM D2632 |
Thermal Properties
| Property | Value | Test Method |
| Service Temperature | -40°F to 200°F | — |
| High Intermittent Temperature | 250°F | — |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Retardant | Yes | — |
| FMVSS-302 | Pass .098″ or thicker | — |
Regulatory / Compliance Data
| Property | Value | Test Method |
| ASTM D1056 | 2A1 | — |
| ASTM D1056 Suffix’s | A1, C1, F2, M | — |
| ASTM D6576 | Type II A, B, C Soft | — |
Compliance
- FMVSS-302 — Compliant (Pass, .098″ or thicker)
- Garage door perimeter seals requiring a soft, easily conformable EPDM closed-cell foam that compresses fully under light door closure force
- Tonneau cover seals where low deflection resistance ensures complete bedside contact with minimal latching force
- HVAC and duct seals in accessible or hand-installed locations requiring a soft, flame retardant closed-cell foam
- Exterior mailbox and enclosure seals where soft compression allows consistent weather sealing under variable closure forces
- General soft weatherstrip and environmental sealing applications requiring ASTM D1056 2A1 / ASTM D6576 Type II Soft classification and FMVSS-302 compliance
Common industries: Automotive, HVAC, construction, general manufacturing.
RE41E is the softest grade in the RE EPDM foam series, constructed from a blend of Ethylene Propylene Diene Monomer (EPDM) and Neoprene. Classified ASTM D1056 2A1 and ASTM D6576 Type II A, B, C Soft, it is specifically designed for applications where ease of compression is needed, including garage door seals, tonneau cover seals, HVAC/duct seals, and exterior mailbox box seals.
Available in four thicknesses from 1/16″ to 1/4″, it provides a soft, conformable foam with high and low temperature resistance and flame retardant performance across a service range of -40°F to 200°F.
The material passes FMVSS-302 at .098″ or thicker. Resilience is 35% per ASTM D2632. Compression set 50% (max) is 40% per ASTM D1056. Water absorption (max) is 10% per ASTM D1056. Tensile strength is 75 psi and elongation is 125% per ASTM D412. Tear strength is 9.6 lb/in per ASTM D624. Compression deflection change after oven aging (max) is 30% per ASTM D1056. Thermal conductivity is .322 btu/(h·ft²·°F) per ASTM C518.
High intermittent temperature is 250°F. ASTM D1056 Suffix’s: A1, C1, F2, M. No UL listings and no MIL-R-6130C or MIL-C-3133C designations are listed on this TDS.
What differentiates RE41E from other grades in the RE EPDM foam series?
RE41E is the softest grade in the RE series at 2–5 psi compression deflection at 25% and 4–8 lb/ft³ density, classified ASTM D1056 2A1 and ASTM D6576 Type II Soft. It has the highest resilience in the series at 35% per ASTM D2632 and the highest water absorption (max) at 10%. Unlike RE42E and RE43E, no MIL-R-6130C, MIL-C-3133C, or UL listings are present on the RE41E TDS, and the thermal conductivity test method (ASTM C518) is specified — which is not listed for the other RE grades.
Why is compression set critical for a soft EPDM foam used in weatherstrip and environmental sealing?
A soft foam compresses under very low closure forces, making it well suited for applications like garage doors and tonneau covers where minimal actuation force is available. However, a soft foam with high compression set will permanently deform under repeated cycling — gradually losing contact pressure against the mating surface and reducing the effectiveness of the weather seal. RE41E's compression set 50% (max) of 40% per ASTM D1056 is the rated maximum for this soft grade, with a resilience of 35% confirming meaningful elastic recovery between compression cycles.
What is the service temperature range for RE41E?
The service temperature range is -40°F to 200°F as listed on the TDS. High intermittent temperature is 250°F.
Is RE41E suitable for regulated automotive environments?
RE41E passes FMVSS-302 at .098" or thicker as listed on the TDS. No UL listings or military specifications are listed on the RE41E TDS.
How should RE41E be specified?
Specify grade (RE41EPDM), ASTM D1056 designation (2A1), applicable suffix designations (A1, C1, F2, M), thickness (1/16", 1/8", 3/16", or 1/4"), color (Black), applicable compliance requirements (FMVSS-302), dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
