Product Overview
HT-820 Firm Silicone Foam — Technical Overview & FAQs
Product Overview
HT-820 is a firm closed-cell silicone foam designed for applications requiring strong sealing, gasketing, and cushioning under higher compression forces. It delivers the durability of a sponge rubber with the superior temperature stability, flame resistance, and weather endurance of silicone. This material performs consistently in extreme temperature environments, vibration damping, and outdoor exposure.
Applications
HT-820 is used for outdoor lighting seals, HVAC systems, electronic enclosures, and mechanical gap-fill pads where firm foam and excellent compression recovery are required. It’s ideal for long-term sealing applications where exposure to UV, ozone, and high heat would degrade other foams.
Performance Advantages
HT-820 stands out for its high tear strength, firm compression deflection (approximately 16 psi at 25 %), and minimal compression set even after prolonged heat aging. It resists water absorption, maintains shape under stress, and provides consistent sealing performance from -67 °F to +392 °F. It is UL 94 V-0 and HF-1 flame rated, meeting stringent fire and smoke standards.
Key Properties
HT-820 has a typical density of around 22 lb/ft³, a compression deflection of 16 psi at 25 % strain, and a compression set of less than 5 % after 22 hours at 212 °F. Water absorption is very low (approximately 0.5 %), and it operates effectively in continuous service from -67 °F to +392 °F. Its closed-cell structure ensures water resistance and long-term stability in both hot and cold environments.
FAQs
What is HT-820 silicone foam?
HT-820 is a firm closed-cell silicone foam designed for sealing and gasketing applications requiring durable, high-compression performance.
Where is HT-820 used?
It’s commonly used in outdoor enclosures, lighting systems, HVAC equipment, and electronic housings where long-term compression strength and environmental resistance are essential.
What makes HT-820 different from other silicone foams?
It has a higher compression force, greater tear and tensile strength, and retains low compression set, even after extended high-temperature exposure.
How does HT-820 perform under environmental stress?
HT-820 maintains its resilience under extreme temperature cycling, UV radiation, and ozone exposure, making it ideal for harsh outdoor or industrial settings.
Can HT-820 be customized or die-cut?
Yes, it can be supplied as sheets, rolls, custom die-cut gaskets, or with adhesive backing for simplified installation.
Contact H-O Products to request HT-820 samples, data sheets, or custom gasket designs for your next sealing or insulation project - contact us.
