Product Overview
BISCO® MS-1660 — Very Firm Closed-Cell Silicone Foam — Technical Overview & FAQs
Product Overview
BISCO® MS-1660 is a very firm, closed-cell silicone foam developed for applications requiring maximum load-bearing strength, dimensional stability, and long-term sealing performance under heavy compression.
Its dense, resilient formulation provides exceptional resistance to compression set and environmental aging, ensuring consistent performance in high-pressure sealing, vibration isolation, and thermal management applications.
With its combination of mechanical durability, flame resistance, and broad temperature stability, MS-1660 is a top-tier material for aerospace, defense, and industrial systems that operate under extreme conditions.
Applications
Heavy-duty flanged seals and enclosure gaskets
Structural gasketing for aerospace and transportation systems
Equipment covers and control panels under high clamp loads
Vibration and impact isolation pads for mechanical assemblies
Flame-resistant sealing in energy, HVAC, and electrical systems
Key Properties
Density: 35 lb/ft³ (560 kg/m³)
Compression Force Deflection (25%): ≈ 20 psi
Compression Set (22 h @ 212 °F): ≤ 5 %
Tensile Strength: 115 psi
Elongation at Break: 75 %
Thermal Conductivity: 0.055 W/m·K
Operating Temperature Range: –67 °F to 392 °F (–55 °C to 200 °C)
Flame Resistance: UL 94 V-0 and HF-1
Weather, Ozone, and UV Resistance: Excellent
Compliances: FAR 25.853, ASTM D1056, UL 94, FMVSS 302
FAQs
What is BISCO MS-1660 used for?
MS-1660 is a very firm, closed-cell silicone foam used for heavy-duty gasketing, vibration damping, and high-compression sealing where structural integrity and long-term durability are critical.
What makes MS-1660 different from other BISCO silicone foams?
It’s the firmest and densest material in the BISCO MS series, providing the highest load-bearing capacity, dimensional stability, and compression-set resistance.
Can MS-1660 withstand extreme temperatures?
Yes — it operates reliably from –67 °F to 392 °F (–55 °C to 200 °C) and maintains its properties after prolonged exposure to heat, cold, and thermal cycling.
Is MS-1660 flame rated?
Absolutely. It meets UL 94 V-0, HF-1, and FAR 25.853 flame resistance standards, making it suitable for aerospace and critical safety applications.
Can MS-1660 be customized or supplied with adhesive backing?
Yes — it’s available as sheets, rolls, or precision die-cut gaskets, with optional silicone or acrylic PSA for quick, peel-and-stick assembly.
Contact H-O Products to request BISCO® MS-1660 samples, technical data sheets, or a quote for custom-fabricated gaskets and seals engineered for high-compression environments - contact us.