BISCO® 7304 – Medium Closed-Cell Silicone Sponge

Product Overview
BISCO 7304 is a medium-density, closed-cell silicone sponge formulated for robust sealing and gasketing in dynamic environments. It provides a balance between compressibility and mechanical strength, making it a reliable choice for long-term sealing applications.

Applications
Ideal for lighting systems, transportation enclosures, and HVAC equipment where repeated compression and expansion cycles occur under environmental stress.

Performance Advantages
7304 retains elasticity under load, resists UV, ozone, and temperature extremes, and maintains its seal after thousands of compression cycles. It is flame-rated UL 94 V-0 and HF-1 and compliant with FMVSS 302.

Key Properties
Density ≈ 25 lb/ft³; compression deflection ≈ 10 psi; compression set < 5 %; operating range –67 °F to +392 °F; flame rating UL 94 V-0/HF-1; ozone and UV resistant.

FAQs

What is BISCO 7304?
A medium-density closed-cell silicone sponge engineered for reliable sealing and vibration resistance under moderate compression.

Where is 7304 used?
In lighting enclosures, HVAC systems, and transportation seals that require a balance of strength and flexibility.

Is 7304 flame rated?
Yes — it meets UL 94 V-0 and HF-1 flame ratings and FMVSS 302 standards.

Does 7304 perform in harsh environments?
Yes — it maintains its mechanical integrity under UV, ozone, and temperature extremes.

Reach out to H-O Products for BISCO 7304 samples, technical data, or custom die-cut solutions - contact us.