BISCO® HT-1260
60 Shore A General Purpose Solid Silicone
BISCO® HT-1260 is a 60 ±5 Shore A solid silicone elastomer engineered for applications requiring increased firmness and dimensional stability under sustained compression and elevated temperature exposure. Rated from −80°F to 425°F, HT-1260 maintains ≤25% compression set after 70 hours at 302°F, supporting reliable sealing performance in higher-load applications.
Key Properties
- Hardness: 60 ±5 Shore A
- Tensile Strength: 1010 psi
- Elongation: ≥150%
- Compression Set: ≤25% (70 hrs @ 302°F, 25%)
- Specific Gravity: 1.23 g/cc
- Recommended Service Temperature: −80°F to 425°F
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Material | Solid Silicone | — |
| Specific Gravity | 1.23 g/cc | ASTM D2240 |
| Thicknesses Available | 0.031″, 0.063″, 0.094″, 0.125″ | — |
| Colors | Red, Black, Gray, White | — |
Mechanical Properties
| Property | Value | Test Method |
| Durometer | 60 ±5 Shore A | ASTM D2240 |
| Tensile Strength | 1010 psi | ASTM D412 |
| Elongation | ≥150% | ASTM D412 |
| Compression Set (70 hrs @ 302°F, 25%) | ≤25% | ASTM D395 |
Heat Aging Performance
(70 Hours @ 437°F)
| Property Change | Value | Test Method |
| Hardness Change | ±10 pts | ASTM D573 |
| Tensile Change | −20% | ASTM D573 |
| Elongation Change | −40% | ASTM D573 |
Oil Immersion Performance
(70 Hours @ 302°F)
| Property Change | Value | Test Method |
| Hardness Change | −10 to +5 pts | ASTM D471 |
| Tensile Change | −10% | ASTM D471 |
| Elongation Change | −15% | ASTM D471 |
| Volume Change | +5% | ASTM D471 |
Environmental Performance
| Property | Value | Test Method |
| Low Temperature Brittleness | Pass | ASTM D2137 |
| Recommended Use Temperature | −80°F to 425°F | — |
Compliance
- A-A-59588 — Compliant
- AMS 3301–3305 — Compliant
- FDA 21 CFR 177.2600 — Compliant
- NSF 51 — Compliant (File MH62230)
- Structural enclosure gasketing
- Access panel seals
- Equipment housing seals
- Fluid-exposed static sealing
- Thermal exposure sealing components
Common industries: aerospace, automotive, electronics, industrial equipment, and regulated processing environments.
HT-1260 is a firmer grade within the HT-1200 series, designed for applications requiring greater resistance to deformation under compressive load. Its 60 Shore A hardness reduces material deflection while maintaining predictable compression retention and thermal stability.
The material demonstrates controlled mechanical change after heat aging and oil immersion testing, supporting use in industrial environments exposed to sustained thermal cycling and fluid contact.
Compliant with A-A-59588, AMS 3301–3305, FDA 21 CFR 177.2600, and NSF 51.
What differentiates HT-1260 from softer HT-1200 grades?
HT-1260 provides increased firmness at 60 Shore A, offering reduced compressibility and greater dimensional stability under load.
Why is compression set critical?
Compression set measures long-term recovery after sustained compression. Lower values support improved sealing retention over time.
What is the operating temperature range?
−80°F to 425°F.
Is HT-1260 suitable for regulated environments?
Yes. It complies with aerospace and food-contact related standards listed above.
How should this material be specified?
Specify grade (HT-1260), thickness, color, compliance requirements, dimensional tolerances, and finished format.
