SCE43B Neoprene Foam
SCE43B is a medium, closed-cell Neoprene/EPDM/SBR foam with a compression deflection of 9–13 psi at 25% per ASTM D1056 and a density of 7–11 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 2A3 and ASTM D6576-07 Type II A, B, Medium.
Key Properties
- Compression Deflection @ 25%: 9–13 psi (ASTM D1056)
- Tensile Strength: 100 psi (ASTM D412)
- Elongation: 125% (ASTM D412)
- Compression Set (Max): 30% (ASTM D1056)
- Density: 7–11 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 | 7–11 lb/ft³ | ASTM D1056 |
| Thermal Conductivity | .38 btu/(h·ft²·°F) | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 9–13 psi | ASTM D1056 |
| Compression Set (Max) | 30% | ASTM D1056 |
| Water Absorption (Max) | 5% | ASTM D1056 |
| Compression Deflection Change After Oven Aging (Max) | ±30% | ASTM D1056 |
| Tensile Strength | 100 psi | ASTM D412 |
| Elongation | 125% | ASTM D412 |
| Tear Strength | 15 lb/in | ASTM D624 |
| Resilience | 20% | 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 | 2A3 | — |
| ASTM D1056-67 | SCE43 | — |
| ASTM D1056-78 | RE43 | — |
| ASTM D1056 Suffix’s | A1, C1, F1, M | — |
| ASTM D6576-07 | Type II A, B, Medium | — |
| MIL-R-6130C | II-A Medium | — |
| MIL-C-3133C MIL STD 670B | SCE11 | — |
| 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 Medium
- MIL-C-3133C MIL STD 670B — SCE11
- Vibration and sound reduction through wall assemblies where medium deflection resistance and MIL-R-6130C II-A Medium compliance are required
- Weatherproofing of skylights, construction joints, and acoustical assemblies in applications requiring the broadest UL listing coverage in the SCE series (UL94 HF-1, UL157, UL48, UL50, UL508, UL50E)
- Door, window, and hatch gasketing requiring a medium-grade closed-cell foam with the lowest compression set and water absorption in the SCE series
- FMVSS-302 compliant automotive and transportation sealing applications requiring a medium closed-cell Neoprene/EPDM/SBR foam
- General environmental sealing and gasketing across construction, HVAC, and industrial markets requiring ASTM D1056 2A3 / ASTM D6576 Type II Medium classification
Common industries: Construction, HVAC, automotive, industrial manufacturing, military.
SCE43B is the medium-grade closed-cell Neoprene/EPDM/SBR foam in the SCE series, classified ASTM D1056-07 2A3 and ASTM D6576-07 Type II A, B, 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, and gasketing of doors, windows, and hatches.
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 Medium. MIL-C-3133C MIL STD 670B is SCE11. Resilience is 20% per ASTM D2632. Compression set (max) is 30% per ASTM D1056 — the lowest in the SCE series. Water absorption (max) is 5% per ASTM D1056 — also the lowest in the SCE series.
Tensile strength is 100 psi and elongation is 125% per ASTM D412. Tear strength is 15 lb/in per ASTM D624. Compression deflection change after oven aging (max) is ±30% per ASTM D1056. Thermal conductivity is .38 btu/(h·ft²·°F). High intermittent temperature is 250°F. ASTM D1056 designations: ASTM D1056-67 SCE43, ASTM D1056-78 RE43. 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 Medium, and MIL-C-3133C MIL STD 670B (SCE11).
What differentiates SCE43B from other grades in the SCE Neoprene foam series?
SCE43B is the medium grade in the SCE series at 9–13 psi compression deflection at 25% and 7–11 lb/ft³ density — the highest density range in the series. It achieves the lowest compression set (max) in the series at 30% (versus 35% for SCE42B and 40% for SCE41B) and the lowest water absorption (max) at 5% (versus 10% for SCE41B and SCE42B). Tear strength is 15 lb/in, higher than SCE41B's and SCE42B's 9.6 lb/in. SCE43B is classified ASTM D1056-07 2A3 and carries MIL-C-3133C MIL STD 670B designation SCE11.
Why is compression set critical for a medium closed-cell Neoprene foam used in weatherproofing and gasketing?
In door, window, hatch, and skylight weatherproofing applications, the foam gasket must maintain contact force against the mating surface across its service life — through repeated thermal cycling, compression cycling from opening and closing, and sustained outdoor weathering. A high compression set means the material permanently deforms under repeated loading, reducing its sealing contact force and allowing weather, moisture, and sound to bypass the gasket over time. SCE43B's compression set (max) of 30% per ASTM D1056 — the lowest in the SCE series — indicates better long-term dimensional recovery than the softer grades, making it the preferred selection where compression set performance is a primary specification criterion.
What is the service temperature range for SCE43B?
The service temperature range is -40°F to 200°F as listed on the TDS. High intermittent temperature is 250°F.
Is SCE43B suitable for regulated automotive, military, and UL-listed environments?
Yes. SCE43B passes FMVSS-302 at .098" or thicker, meets MIL-R-6130C II-A Medium, meets MIL-C-3133C MIL STD 670B (SCE11), and is Listed under UL94 HF-1, UL157, UL48, UL50, UL508, and UL50E, as listed on the TDS.
How should SCE43B be specified?
Specify grade (SCE43BNEO), ASTM D1056 designation (2A3), applicable suffix designations (A1, C1, F1, M), thickness, color (Black), applicable compliance requirements (FMVSS-302, MIL-R-6130C II-A Medium, UL94 HF-1, UL157, UL48, UL50, UL508, UL50E), dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
