BISCO® HT-6360 Fire-Safe
BISCO® HT-6360 is a fire-safe solid silicone rated at 60 Shore A, designed to protect sensitive applications from flame damage through superior flame, smoke, and toxicity (FST) resistance. It achieves UL 94 V-0 (File E83967), meets ASTM E162 flame spread index requirements, and meets ASTM E662 smoke density requirements. The material is rated for service from -67°F to 392°F and provides resistance to UV, ozone, extreme temperatures, and most fluids.
Key Properties
- Durometer, Shore A: 60 — ASTM D2240
- Tensile Strength: >200 psi — ASTM D412
- Elongation: >125% — ASTM D412
- Compression Set, 70 Hours @ 302°F @ 25%: <35% — ASTM D395
- Specific Gravity: 1.71 g/cc — —
- Temperature Range: -67°F to 392°F
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Material / Substrate | Solid Silicone | — |
| Color | Black | — |
| Specific Gravity | 1.71 g/cc | — |
| Thickness | 0.020″, 0.031″, 0.063″, 0.125″ | — |
Mechanical Properties
| Property | Value | Test Method |
| Durometer, Shore A | 60 | ASTM D2240 |
| Tensile Strength | >200 psi | ASTM D412 |
| Elongation | >125% | ASTM D412 |
| Compression Set, 70 Hours @ 302°F @ 25% | <35% | ASTM D395 |
Thermal Properties
| Property | Value | Test Method |
| Temperature Range | -67°F to 392°F | — |
| Thermal Conductivity | 0.10 W/m·K | ASTM D518 |
Electrical Properties
| Property | Value | Test Method |
| Dielectric Strength | 386 Volts/mil | ASTM D149 |
| Dielectric Constant | 2.76 kHz | ASTM D150 |
| Dissipation Factor | 0.003 kHz | ASTM D495 |
| Dry Arc Resistance | 124 seconds | ASTM D495 |
| Volume Resistivity | 10^14 Ohm-cm | ASTM D257 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Resistance | Meets | UL 94 (File E83967) V-0 |
| Flame Spread Index | Meets | ASTM E162 |
| Smoke Density | Meets | ASTM E662 |
Environmental Performance
| Property | Value | Test Method |
| Low Temperature Brittleness @ -80°F @ 3 Minutes | Pass | ASTM D2137 |
| UV Resistance | Yes | — |
| Ozone Resistance | Yes | — |
Compliance
- UL 94 — Compliant (File E83967, V-0)
- ASTM E162 — Meets
- ASTM E662 — Meets
- Fire and smoke sealing in aerospace, industrial, and building assemblies requiring UL 94 V-0 compliance
- Flexible dust gaskets in aerospace applications where fire safety is a critical design requirement
- Medical equipment cabinets and medical device enclosures requiring flame-safe sealing materials
- Outdoor enclosure gaskets in high-temperature environments with fire exposure risk
- Sealing applications in enclosed compartments requiring superior FST resistance
Common industries: Aerospace, medical devices, building and construction, industrial equipment, telecommunications.
BISCO® HT-6360 is a fire-safe solid silicone at 60 Shore A, formulated to deliver superior flame, smoke, and toxicity (FST) resistance for applications in which fire safety is a critical design requirement.
It achieves UL 94 V-0 classification (File E83967) and meets the requirements of ASTM E162 for flame spread index and ASTM E662 for smoke density, making it appropriate for aerospace flexible dust gaskets, fire and smoke sealing assemblies, medical equipment cabinets, and outdoor enclosures exposed to high-temperature environments.
With a specific gravity of 1.71 g/cc — significantly denser than standard solid silicone grades — the compound is formulated with fire-retardant chemistry that provides fire protection in enclosed compartments.
Electrical insulation properties include 386 Volts/mil dielectric strength and 10^14 Ohm-cm volume resistivity. The material passes low temperature brittleness testing at -80°F for 3 minutes per ASTM D2137 and exhibits UV and ozone resistance. High tear strength and extremely tight thickness tolerances support gasket integrity in fire-safe applications.
Compliant with UL 94 V-0 (File E83967), ASTM E162 — Meets, ASTM E662 — Meets.
What differentiates BISCO® HT-6360 from standard solid silicone grades?
HT-6360 is the only fire-safe grade in the BISCO® HT-6 series, achieving UL 94 V-0 classification (File E83967) and meeting ASTM E162 flame spread and ASTM E662 smoke density requirements. Its specific gravity of 1.71 g/cc reflects the fire-retardant compound chemistry that delivers superior FST resistance — a level of flame, smoke, and toxicity performance that standard solid silicone grades do not provide.
Why is compression set an important consideration for solid silicone elastomers?
Compression set measures how well an elastomer recovers its original thickness after sustained compression. In sealing applications, a material with high compression set will permanently deform over time, reducing sealing force and allowing leak paths to develop. BISCO® HT-6360 achieves <35% compression set (70 hours @ 302°F @ 25% deflection per ASTM D395), supporting sustained sealing performance in fire-safe applications at elevated temperatures.
What is the temperature range for BISCO® HT-6360?
BISCO® HT-6360 is rated for service from -67°F to 392°F, as listed on the TDS.
Is BISCO® HT-6360 suitable for flame-rated and fire-safe environments?
Yes. BISCO® HT-6360 achieves UL 94 V-0 (File E83967) and meets ASTM E162 flame spread index and ASTM E662 smoke density requirements, as stated on the TDS. It is specifically designed for applications where fire safety is a critical design requirement.
How should BISCO® HT-6360 be specified?
Specify grade (BISCO® HT-6360), thickness, compliance requirements (UL 94 V-0 / ASTM E162 / ASTM E662), dimensional tolerances, and finished format.
