SCE42B Neoprene Foam
SCE42B is a medium/soft, closed-cell Neoprene/EPDM/SBR foam with a compression deflection of 5–9 psi at 25% per ASTM D1056 and a density of 4–8 lb/ft³, available in ten thicknesses from 1/16″ to 1″. The material has a service temperature range of -40°F to 200°F, passes FMVSS-302 at .098″ or thicker, and is Listed under UL94 HF-1, UL157, UL48, UL50, UL508, and UL50E. It is classified ASTM D1056-07 2A2 and ASTM D6576-07 Type II A, B, C, Soft/Medium.
Key Properties
- Compression Deflection @ 25%: 5–9 psi (ASTM D1056)
- Tensile Strength: 100 psi (ASTM D412)
- Elongation: 125% (ASTM D412)
- Compression Set (Max): 35% (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″, 5/16″, 3/8″, 1/2″, 5/8″, 3/4″, 1″ | — |
| Color | Black | — |
| Polymer | Neoprene / Ethylene Propylene Diene Monomer (EPDM) / Styrene Butadiene Rubber (SBR) | — |
| Density | 4–8 lb/ft³ | ASTM D1056 |
| Thermal Conductivity | .30 btu/(h·ft²·°F) | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 5–9 psi | ASTM D1056 |
| Compression Set (Max) | 35% | ASTM D1056 |
| Water Absorption (Max) | 10% | ASTM D1056 |
| Compression Deflection Change After Oven Aging (Max) | ±30% | ASTM D1056 |
| Tensile Strength | 100 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 | — |
| UL94 HF-1 | Listed¹ | — |
Regulatory / Compliance Data
| Property | Value | Test Method |
| ASTM D1056-07 | 2A2 | — |
| ASTM D1056-67 | SCE42 | — |
| ASTM D1056-78 | RE42 | — |
| ASTM D1056 Suffix’s | A1, C1, F1, M | — |
| ASTM D6576-07 | Type II A, B, C, Soft/Medium | — |
| MIL-R-6130C | II-A Soft/Medium | — |
| MIL-C-3133C MIL STD 670B | SCE7 | — |
| UL157 | Listed | — |
| UL48 | Listed | — |
| UL50 | Listed | — |
| UL508 | Listed | — |
| UL50E | Listed | — |
Compliance
- FMVSS-302 — Compliant (Pass, .098″ or thicker)
- UL94 HF-1 — Listed¹
- UL157 — Listed
- UL48 — Listed
- UL50 — Listed
- UL508 — Listed
- UL50E — Listed
- MIL-R-6130C — II-A Soft/Medium
- MIL-C-3133C MIL STD 670B — SCE7
- Vibration and sound reduction through wall assemblies where medium/soft deflection resistance and MIL-R-6130C II-A Soft/Medium compliance are required
- Weatherproofing of skylights, construction joints, and acoustical assemblies in applications requiring UL157, UL48, UL50, UL508, and UL50E Listed status
- Cleanroom, door, window, and hatch gasketing where a soft/medium grade provides better sealing conformance than medium grades under moderate closure forces
- Sports equipment cushioning requiring a soft/medium closed-cell foam with FMVSS-302 flame compliance
- General environmental sealing and gasketing across industrial, construction, and automotive applications requiring ASTM D1056 2A2 / ASTM D6576 Type II Soft/Medium classification
Common industries: Construction, HVAC, automotive, industrial manufacturing, military.
SCE42B is the medium/soft-grade closed-cell Neoprene/EPDM/SBR foam in the SCE series, classified ASTM D1056-07 2A2 and ASTM D6576-07 Type II A, B, C, Soft/Medium. It is constructed from a blend of Neoprene, Ethylene Propylene Diene Monomer (EPDM), and Styrene Butadiene Rubber (SBR), providing high and low temperature resistance across a service range of -40°F to 200°F.
Available in ten thicknesses from 1/16″ to 1″, it is suited for vibration and sound reduction through wall assemblies, weatherproofing for skylights, construction and acoustical applications, gasketing of cleanrooms, doors, windows, and hatches, and sports equipment cushioning.
The material passes FMVSS-302 at .098″ or thicker, is flame retardant (Yes), and is Listed under UL94 HF-1, UL157, UL48, UL50, UL508, and UL50E. MIL-R-6130C classification is II-A Soft/Medium. MIL-C-3133C MIL STD 670B is SCE7. Resilience is 35% per ASTM D2632. Compression set (max) is 35% per ASTM D1056. Water absorption (max) is 10% per ASTM D1056. Tensile strength is 100 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 .30 btu/(h·ft²·°F). High intermittent temperature is 250°F. ASTM D1056 designations: ASTM D1056-67 SCE42, ASTM D1056-78 RE42. ASTM D1056 Suffix’s: A1, C1, F1, M.
Compliant with FMVSS-302 (Pass, .098″ or thicker), UL94 HF-1 (Listed¹), UL157 (Listed), UL48 (Listed), UL50 (Listed), UL508 (Listed), UL50E (Listed), MIL-R-6130C II-A Soft/Medium, and MIL-C-3133C MIL STD 670B (SCE7).
What differentiates SCE42B from other grades in the SCE Neoprene foam series?
SCE42B is positioned between the soft SCE41B (2–5 psi CFD) and the medium SCE43B (9–13 psi CFD), with a compression deflection of 5–9 psi at 25% and the same 4–8 lb/ft³ density range as SCE41B. It is classified ASTM D1056-07 2A2 and ASTM D6576-07 Soft/Medium. SCE42B carries MIL-R-6130C II-A Soft/Medium and MIL-C-3133C MIL STD 670B (SCE7) designations, and is Listed under UL157 in addition to the UL48, UL50, UL508, and UL50E listings shared with SCE41B. Compression set (max) is 35% — lower than SCE41B's 40% — and thermal conductivity is .30 btu/(h·ft²·°F), distinct from SCE43B's .38 and SCE41B's .322.
Why is compression set critical for a medium/soft closed-cell Neoprene foam used in gasketing and weatherproofing?
In door, window, hatch, and cleanroom gasketing applications, the foam must maintain contact force against the mating surface across its service life to preserve the environmental seal. A medium/soft foam grade with high compression set will permanently flatten under the applied closure load, reducing sealing force and allowing gaps to form through which moisture, dust, air, or sound can bypass the gasket. SCE42B's compression set (max) of 35% per ASTM D1056 indicates better recovery characteristics than the softer SCE41B (40% max), appropriate for applications requiring a moderate improvement in compression set performance at a soft/medium deflection resistance.
What is the service temperature range for SCE42B?
The service temperature range is -40°F to 200°F as listed on the TDS. High intermittent temperature is 250°F.
Is SCE42B suitable for regulated automotive, military, and UL-listed environments?
Yes. SCE42B passes FMVSS-302 at .098" or thicker, meets MIL-R-6130C II-A Soft/Medium, meets MIL-C-3133C MIL STD 670B (SCE7), and is Listed under UL94 HF-1, UL157, UL48, UL50, UL508, and UL50E, as listed on the TDS.
How should SCE42B be specified?
Specify grade (SCE42BNEO), ASTM D1056 designation (2A2), applicable suffix designations (A1, C1, F1, M), thickness, color (Black), applicable compliance requirements (FMVSS-302, MIL-R-6130C II-A Soft/Medium, UL94 HF-1, UL157, UL48, UL50, UL508, UL50E), dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
