BISCO® BF-1000 – Extra Soft
BISCO® BF-1000 is a highly compressible, extra soft closed cell silicone foam engineered for applications requiring low closure force and reliable long-term environmental sealing. Rated from −67°F to 392°F, BF-1000 delivers 2.4 psi compression force deflection at 25% deflection and achieves 1.70% compression set after 22 hours at 212°F, providing consistent seal integrity under minimal compressive load.
Key Properties
- Compression Force Deflection @ 25%: 2.4 psi
- Tensile Strength: 35 psi
- Elongation: ≥60%
- Compression Set: 1.70% (22 hrs @ 212°F, 50%)
- Density: 12 lb/ft³
- Recommended Service Temperature: −67°F to 392°F
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Material | Closed Cell Silicone Foam | — |
| Density | 12 lb/ft³ | — |
| Thermal Conductivity | 0.048 W/m°K | ASTM D518 |
| Thicknesses Available | 1/16″, 3/32″, 1/8″, 3/16″, 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 1″ | — |
| Colors | Black, Gray, White | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection @ 25% | 2.4 psi | ASTM D1056 |
| Compression Set (22 hrs @ 212°F, 50%) | 1.70% | ASTM D1056 |
| Tensile Strength | 35 psi | ASTM D412 |
| Elongation (Minimum) | 60% | ASTM D412 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Retardant | Yes | — |
| Flame Spread Index (LS) | <35 | ASTM E162 |
| Smoke Density (Ds) @ 1.5 Minutes | <100 | ASTM E662 |
| Smoke Density (Ds) @ 4 Minutes | <200 | ASTM E662 |
| UL 94 HF-1 | Pass | — |
| UL 94 V0 | Pass | — |
| FMVSS-302 | Pass | — |
Environmental Performance
| Property | Value | Test Method |
| UV Resistance | Yes | — |
| Ozone Resistance | Yes | — |
| Low Temperature Flexibility | −67°F | ASTM D1056 |
| Recommended Use Temperature | −67°F to 392°F | — |
Compliance
- FDA CFR 177.2600 — Compliant
- UL 94 HF-1 — Compliant
- UL 94 V0 — Compliant
- FMVSS-302 — Compliant
- Environmental sealing against dust, moisture, air, and light in outdoor enclosures
- Lighting fixture and HVAC unit gasketing
- Electronic cabinet and enclosure seals
- Vibration isolation in electronic components and transportation vehicles
- Fire retardant thermal insulation
Common industries: electronics, transportation, HVAC, lighting, and industrial equipment.
BF-1000 is an extra soft, closed cell silicone foam designed for sealing applications where low closure force is critical. Its patented chemistry and cell structure deliver long-term performance advantages, including temperature independence and resistance to UV and ozone degradation. The material’s high compressibility makes it well-suited for conforming to irregular surfaces while maintaining a reliable environmental seal.
BF-1000 is rated to the most stringent flame standards, passing UL 94 V0, UL 94 HF-1, and FMVSS-302, making it suitable for applications in transportation, electronics, and outdoor enclosure environments. Its low compression set ensures sustained sealing force retention over extended service life.
Compliant with FDA CFR 177.2600, UL 94 HF-1, UL 94 V0, and FMVSS-302.
What differentiates BF-1000 from other silicone foam grades?
BF-1000 is the extra soft grade, offering the lowest closure force in the BF series — ideal for applications where minimal compressive load is required to achieve a reliable seal.
Why is compression set critical?
Compression set measures long-term recovery after sustained compression. Lower values indicate better sealing force retention over the life of the application.
What is the operating temperature range?
−67°F to 392°F
Is BF-1000 suitable for regulated environments?
Yes. It complies with FDA CFR 177.2600 for food-contact applications and meets UL 94 V0, UL 94 HF-1, and FMVSS-302 flame standards.
How should this material be specified?
Specify grade (BF-1000), thickness, color, compliance requirements, dimensional tolerances, and finished format.
