C41ECH Epichlorohydrin Foam
C41ECH is a soft, conformable Epichlorohydrin (ECH) foam with a compression deflection of 2–5 psi at 25% per ASTM D1056 and a density of 15 lb/ft³, available in four thicknesses from 1/16″ to 1/4″. The material has a service temperature range of -40°F to 325°F and passes FMVSS-302. With low swell when in contact with oil and fuel, it is specifically designed for high-temperature gasketing and sealing environments where exposure to fuel and/or oil is expected. It is classified ASTM D1056-07 2B1.
Key Properties
- Compression Deflection @ 25%: 2–5 psi (ASTM D1056)
- Tensile Strength: 120 psi (ASTM D412)
- Elongation: 250% (ASTM D412)
- Compression Set (Max): 25% (ASTM D1056)
- Density: 15 lb/ft³ (ASTM D1056)
- Service Temperature: -40°F to 325°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 | Epichlorohydrin Foam | — |
| Density | 15 lb/ft³ | ASTM D1056 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 2–5 psi | ASTM D1056 |
| Compression Set (Max) | 25% | ASTM D1056 |
| Compression Deflection Change After Oven Aging (Max) | ±30% | ASTM D1056 |
| Water Absorption (Max) | 5% | ASTM D1056 |
| Tensile Strength | 120 psi | ASTM D412 |
| Elongation | 250% | ASTM D412 |
| Tear Strength | 18 lb/in | ASTM D624 |
Thermal Properties
| Property | Value | Test Method |
| Service Temperature | -40°F to 325°F | — |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Retardant | Yes | — |
| FMVSS-302 | Pass | — |
Regulatory / Compliance Data
| Property | Value | Test Method |
| ASTM D1056-07 | 2B1 | — |
| ASTM D1056 Suffix’s | B2, F1, M | — |
Compliance
- FMVSS-302 — Compliant (Pass)
- High-temperature engine bay and fuel system gaskets and seals where simultaneous exposure to fuel and/or oil and elevated temperatures up to 325°F requires an ECH foam rather than EPDM, Neoprene, or NBR/PVC blends
- Automotive and industrial gasketing in thermally demanding environments where standard polymer foams experience excessive swell or degradation on contact with petroleum-based fluids
- Sealing components in high-temperature mechanical assemblies where FMVSS-302 flame compliance and a service range of -40°F to 325°F are both required
- Applications requiring a soft (2–5 psi CFD), high tensile strength (120 psi), high elongation (250%) ECH foam in thicknesses from 1/16″ to 1/4″
- Fuel-contact and oil-contact sealing applications classified ASTM D1056-07 2B1 where no other foam polymer in the product line can simultaneously meet the fluid resistance and temperature requirements
Common industries: Automotive, industrial manufacturing, fluid handling, mechanical equipment.
C41ECH is a soft, conformable Epichlorohydrin (ECH) foam classified ASTM D1056-07 2B1, specifically designed for high-temperature gasketing and sealing applications where the foam will be exposed to fuel and/or oil.
The ECH polymer provides low swell on contact with oil and fuel — a property not achievable with standard EPDM, Neoprene, or NBR/PVC blend foams in these chemical environments — making C41ECH the appropriate selection when both elevated temperature performance and resistance to fuel and oil swelling are simultaneously required.
Available in four thicknesses from 1/16″ to 1/4″, it serves applications across the engine bay and fuel system gasketing environments where no other polymer type in the product line is appropriate.
The material achieves a service temperature range of -40°F to 325°F — the highest upper service temperature of any foam in the product line. Tensile strength is 120 psi and elongation is 250% per ASTM D412 — both among the highest values in the foam series. Tear strength is 18 lb/in per ASTM D624. Compression set (max) is 25% per ASTM D1056. Water absorption (max) is 5% per ASTM D1056.
Compression deflection change after oven aging (max) is ±30% per ASTM D1056. The material is flame retardant (Yes) and passes FMVSS-302. ASTM D1056 Suffix’s: B2, F1, M. No resilience, thermal conductivity, UL listings, or weather resistance values are listed on this TDS.
Compliant with FMVSS-302 (Pass).
What differentiates C41ECH from EPDM, NBR/PVC, and Neoprene foam grades?
C41ECH is constructed from Epichlorohydrin (ECH) — a polymer that provides low swell when in contact with oil and fuel, a performance characteristic that EPDM, Neoprene, and NBR/PVC blend foams cannot provide in petroleum fluid environments. Its service temperature of -40°F to 325°F is the highest upper temperature limit of any foam in the product line, making it the only appropriate foam selection for high-temperature fuel and oil gasketing applications where both fluid resistance and thermal performance are required simultaneously.
Why is compression set critical for an ECH foam used in high-temperature fuel and oil gasketing?
In high-temperature engine and fuel system gasketing, the foam must maintain adequate contact force against the mating surfaces across the full thermal and chemical service environment. A high compression set in a high-temperature service foam means the material permanently deforms under the combined effect of heat, fluid exposure, and sustained compression — losing the sealing contact pressure required to prevent fluid, vapor, or gas leakage. C41ECH's compression set (max) of 25% per ASTM D1056 is the rated maximum permanent deformation, confirming acceptable dimensional recovery for its intended high-temperature, fuel-contact sealing applications.
What is the service temperature range for C41ECH?
The service temperature range is -40°F to 325°F as listed on the TDS.
Is C41ECH suitable for regulated automotive environments?
Yes. C41ECH passes FMVSS-302 and is flame retardant (Yes) as listed on the TDS. No UL listings are present on this TDS.
How should C41ECH be specified?
Specify grade (C41ECH), ASTM D1056 designation (2B1), applicable suffix designations (B2, F1, 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 gasket/seal component). Note the intended fluid exposure environment (fuel and/or oil) when communicating application requirements.
