EnsoLite® EF0
EnsoLite® EF0 is a super soft, crushed, semi-closed cell EPDM foam produced in continuous roll form with a density of 4.37–6.24 lb/ft³ (70–100 kg/m³) and an ASTM D 1056 1A0 designation (with an exception to elevated temperature compression set at 70°C / 158°F). The material is engineered for space filling and sealing against air, dust, heat, and noise, with an operating range of -75°C (-103°F) minimum to 121°C (250°F) intermittent maximum. EF0 meets multiple automotive OEM specifications and passes FMVSS 302 burn rate testing at 0.125 in (3.18 mm) and higher.
Key Properties
- Compression Deflection @ 25%: 0.80 psi max / 5.51 kPa max | ASTM D1056
- Compression Set: 5% max | ASTM D1056
- Tensile Strength: 16 psi min / 110 kPa min | ASTM D412 (Die A)
- Elongation: 150% min | ASTM D412 (Die A)
- Density: 4.37 – 6.24 lb/ft³ / 70 – 100 kg/m³ | ASTM D1056
- Operating Temperature: Min: -75°C (-103°F) / Max (Intermittent): 121°C (250°F)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Color | Black | — |
| Cell Structure | Semi-closed | — |
| Polymer | EPDM | — |
| Form | Roll | — |
| ASTM D 1056 Designation | 1A0* | — |
| ASTM D1056 Exception | *50% compression set at elevated temperature 70°C (158°F) | — |
| Density | 4.37 – 6.24 lb/ft³ / 70 – 100 kg/m³ | ASTM D1056 |
Mechanical Properties
| Property | Value | Test Method |
| Compression Set | 5% max | ASTM D1056 |
| Compression Set (Elevated Temperature) | 80% max | ASTM D1056 |
| Tensile Strength | 16 psi min / 110 kPa min | ASTM D412 (Die A) |
| Elongation | 150% min | ASTM D412 (Die A) |
| Tear Strength | 4.85 lb/in min / 0.85 kN/m min | ASTM D624 (Die C) |
Compression Deflection
| Property | Value | Test Method |
| Compression Deflection 25% | 0.80 psi max / 5.51 kPa max | ASTM D1056 |
| Compression Deflection 50% | 1.20 psi max / 8.27 kPa max | ASTM D1056 |
| Compression Deflection 50% – 60 sec Hold | 0.725 psi max / 5.0 kPa max | ISO 3386-1 |
| Change in Compression Deflection¹ | <2 psi (13.8 kPa) | ASTM D1056 |
¹ If this grade after aging still falls within the compression-deflection requirement of <2 psi (<13.8 kPa), it shall be considered acceptable even though the change from the original is greater than ±20%.
Thermal Properties
| Property | Value | Test Method |
| Operating Temperature | Min: -75°C (-103°F) / Max (Intermittent): 121°C (250°F) | — |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame FMVSS 302 (Burn Rate) | 3.94 in/minute (100 mm/minute) max — Passes at 0.125 in (3.18 mm) and higher | FMVSS 302 |
Compliance
- FMVSS 302 — Compliant (Passes at 0.125 in / 3.18 mm and higher)
- General Motors GMW 17408 — Compliant (Class I Type I — Interior & Exterior Applications)
- Stellantis (FCA / Chrysler) MSAY 550 MS.90145 — Compliant (Type 2)
- MAHLE GN AR 06220 (MAHLE GN AR 06346) Par 6.13 — Compliant (Previously Delphi SD2 207 Par 6.13)
- Automotive interior and exterior space filling and cavity sealing components meeting OEM specifications
- Air, dust, heat, and noise barrier seals in vehicle body assemblies and enclosures
- Low-temperature outdoor sealing applications requiring EPDM ozone and UV resistance
- OEM gasketing components for powertrain, HVAC, and body systems requiring FMVSS 302 compliance
- Noise reduction inserts and baffles in automotive and industrial assemblies
Common industries: Automotive, Transportation, Industrial
EnsoLite® EF0 is a super soft, semi-closed cell EPDM foam produced in continuous roll form and designed for space filling and sealing applications in automotive, outdoor, and noise reduction environments. As a crushed foam construction, EF0 delivers excellent conformability at very low compression forces, making it well suited for applications where minimal load on mating surfaces is required.
It meets ASTM D 1056 1A0 requirements, with a noted exception for elevated temperature compression set at 70°C (158°F), and is approved by General Motors, Stellantis (FCA/Chrysler), and MAHLE.
The EPDM polymer base provides excellent resistance to ozone, weather, and UV exposure, supporting both interior and exterior automotive applications across a broad service temperature range. EF0 passes FMVSS 302 burn rate testing at thicknesses of 0.125 in (3.18 mm) and higher. Compression deflection values at 25%, 50%, and 50% with 60-second hold are all characterized, reflecting the material’s suitability for dynamic sealing and space-filling conditions.
The change in compression deflection after aging is controlled to <2 psi (<13.8 kPa) per ASTM D1056, with the note that if the aged value still falls within this limit, the grade is considered acceptable even if the change from the original exceeds ±20%.
Compliant with FMVSS 302; meets GMW 17408 Class I Type I (General Motors), MSAY 550 MS.90145 Type 2 (Stellantis / FCA / Chrysler), and GN AR 06220 / GN AR 06346 Par 6.13 (MAHLE).
What differentiates EnsoLite® EF0 from firmer grades of EPDM sponge foam?
EnsoLite® EF0 is a super soft, crushed EPDM foam with a maximum compression deflection at 25% of 0.80 psi — making it one of the softest grades in the series. This low load-bearing characteristic is specifically engineered for space filling and sealing where minimal force on mating surfaces is required, such as in automotive cavity filling and vibration isolation gaps.
Why is compression set critical for an EPDM foam used in automotive sealing applications?
Compression set measures the permanent deformation a foam retains after sustained compression. For automotive seals and space-filling components installed under long-term load, a high compression set means the foam will not fully recover when load is removed, leading to gaps in the seal and potential infiltration of air, dust, moisture, and noise. EnsoLite® EF0 is rated at 5% max under standard conditions, though it carries a noted exception of 80% max at elevated temperature (70°C / 158°F).
What is the operating temperature range for EnsoLite® EF0?
The operating temperature range is Min: -75°C (-103°F) / Max (Intermittent): 121°C (250°F) as stated on the TDS.
Is EnsoLite® EF0 suitable for automotive OEM environments?
Yes. EnsoLite® EF0 meets General Motors GMW 17408 Class I Type I (Interior & Exterior Applications), Stellantis (FCA/Chrysler) MSAY 550 MS.90145 Type 2, and MAHLE GN AR 06220 (GN AR 06346) Par 6.13, and passes FMVSS 302 burn rate testing at 0.125 in (3.18 mm) and higher.
How should EnsoLite® EF0 be specified?
Specify grade (EnsoLite® EF0), thickness, color (Black), compliance requirements (OEM specification and/or FMVSS 302), dimensional tolerances, and finished format.
