Silicone Foam
BISCO® HT‑840 Extra Firm Silicone Foam
Extra-firm silicone foam for high-closure-force gaskets, press pads, and demanding sealing applications
BISCO® HT-840 is an extra-firm cellular silicone foam designed for applications that require durable sealing, higher compression resistance, and long-term performance. It is often used in gasket designs where a firmer material is needed to maintain sealing integrity under demanding conditions.
Compared to lighter silicone foam grades, BISCO® HT-840 offers higher tear and tensile strength, making it a strong choice for rugged enclosure gaskets, high-closure-force seals, and press pad applications. Its extra-firm structure helps provide conformability and even pressure distribution in applications exposed to heat, compression, and repeated use.
Why Choose BISCO® HT-840?
BISCO® HT-840 is often selected when a gasket, seal, or pad needs extra firmness, durability, and compression strength.
- Extra-firm cellular silicone foam for demanding gasket applications
- Designed for durable, high-closure-force sealing
- Higher tear and tensile strength than lighter silicone foam grades
- Strong choice for rugged enclosures and heavy-duty seals
- Useful for press pads requiring conformability and even pressure distribution
- Resistant to UV, ozone, extreme temperatures, and flame
- Helps provide long-term sealing performance in demanding environments
Common Applications for BISCO® HT-840
BISCO® HT-840 is commonly used in applications that require a firmer silicone foam material with durable sealing and pressure-distribution performance.
- High-closure-force enclosure gaskets
- Heavy-duty electrical enclosure seals
- Outdoor communication cabinet gaskets
- Lighting enclosure seals
- Industrial equipment gaskets
- Press pads
- Pressure-distribution pads
- Heat-resistant cushioning components
- Shock and vibration isolation pads
- Flame-resistant gasket applications
Data Sheets
Custom BISCO® HT-840 Gaskets, Seals & Converted Parts
SRP converts BISCO® HT-840 into custom die-cut gaskets, seals, press pads, strips, cushions, and other precision components. Parts can be manufactured to your drawing, dimensions, sample, or material specification, with adhesive backing available when required.
Our team can help review your gasket design, material thickness, compression requirements, closure-force needs, adhesive requirements, temperature exposure, and production quantities to support a reliable finished part.
Need Custom BISCO® HT-840 Gaskets or Converted Parts?
SRP converts BISCO® HT-840 into custom die-cut gaskets, seals, pads, and other precision components for demanding applications.
Send us your drawing, dimensions, material requirements, adhesive needs, and estimated usage, and our team will help review the best path forward.