BISCO® HT-6135 Tight Tolerance
BISCO® HT-6135 is a tight tolerance solid silicone rated at 33 Shore A, engineered to achieve superior sealing through high tear strength and the tightest thickness tolerances of all solid silicones in the BISCO® HT series. It delivers >800 psi tensile strength, 116 ppi tear resistance, and a compression set of <25% (70 hours @ 302°F @ 25% deflection). 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: 33 — ASTM D2240
- Tensile Strength: >800 psi — ASTM D412
- Elongation: 580 — ASTM D412
- Compression Set, 70 Hours @ 302°F @ 25%: <25% — ASTM D395
- Specific Gravity: 1.22 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 | Cream | — |
| Specific Gravity | 1.22 g/cc | — |
| Thickness | 0.010″, 0.020″, 0.031″, 0.063″ | — |
Mechanical Properties
| Property | Value | Test Method |
| Durometer, Shore A | 33 | ASTM D2240 |
| Tensile Strength | >800 psi | ASTM D412 |
| Elongation | 580 | ASTM D412 |
| Tear Resistance | 116 ppi | ASTM D624 |
| Compression Set, 70 Hours @ 302°F @ 25% | <25% | ASTM D395 |
Thermal Properties
| Property | Value | Test Method |
| Temperature Range | -67°F to 392°F | — |
| Thermal Conductivity | 0.31 W/m·K | ASTM D518 |
Electrical Properties
| Property | Value | Test Method |
| Dielectric Strength | 381 Volts/mil | ASTM D149 |
| Dielectric Constant | 2.95 kHz | ASTM D150 |
| Dissipation Factor | 0.001 kHz | ASTM D495 |
| Dry Arc Resistance | 145 seconds | ASTM D495 |
| Volume Resistivity | 10^14 Ohm-cm | ASTM D257 |
Environmental Performance
| Property | Value | Test Method |
| Low Temperature Brittleness @ -80°F @ 3 Minutes | Pass | ASTM D2137 |
| UV Resistance | Yes | — |
| Ozone Resistance | Yes | — |
- Industrial machinery gaskets requiring the tightest dimensional tolerances available in solid silicone sheeting
- Handheld and portable device gaskets where thickness precision directly affects seal performance
- Seals for digital camera lenses, battery hatches, and cell culture plates demanding high dimensional accuracy
- Precision electronic and optical component sealing where gasket thickness variation must be minimized
- High-performance sealing applications across a broad service temperature range
Common industries: Industrial equipment, consumer electronics, medical devices, optical instruments, life sciences.
BISCO® HT-6135 is a tight tolerance solid silicone at 33 Shore A, distinguished by the tightest thickness tolerances available among BISCO® HT series solid silicone sheeting.
This dimensional precision is critical in high-performance sealing applications such as industrial machinery gaskets, handheld device gaskets, and seals for camera lenses, battery hatches, and cell culture plates, where dimensional variability in the gasket directly affects sealing integrity and product performance. High tear resistance of 116 ppi further ensures gasket durability in precision applications.
The material provides 381 Volts/mil dielectric strength, 10^14 Ohm-cm volume resistivity, 145 seconds dry arc resistance — the highest in the HT-6 series — and a thermal conductivity of 0.31 W/m·K. It passes low temperature brittleness testing at -80°F for 3 minutes per ASTM D2137 and exhibits UV and ozone resistance.
What differentiates BISCO® HT-6135 from other HT-6 series solid silicone grades?
BISCO® HT-6135 is distinguished by the tightest thickness tolerances of all solid silicones in the BISCO® HT series, as stated on the TDS. This dimensional precision makes it the correct selection for gasket applications where variability in material thickness directly affects sealing force, alignment, or optical/mechanical performance — such as camera lens seals and cell culture plate gaskets. It also delivers the highest dry arc resistance (145 seconds) and highest thermal conductivity (0.31 W/m·K) in the HT-6 lineup.
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-6135 achieves <25% compression set (70 hours @ 302°F @ 25% deflection per ASTM D395), supporting sustained sealing performance at elevated operating temperatures.
What is the temperature range for BISCO® HT-6135?
BISCO® HT-6135 is rated for service from -67°F to 392°F, as listed on the TDS.
Is BISCO® HT-6135 suitable for electronic and precision industrial sealing applications?
Yes. The TDS lists dielectric strength of 381 Volts/mil, volume resistivity of 10^14 Ohm-cm, dry arc resistance of 145 seconds, and UV and ozone resistance, supporting use in precision electronic, optical, and industrial sealing environments. No specific compliance standards are cited on the TDS.
How should BISCO® HT-6135 be specified?
Specify grade (BISCO® HT-6135), thickness, dimensional tolerances, and finished format.
