DOW SILASTIC 8257 is a two-component, room-temperature curing silicone foam with outstanding thermo-mechanical properties to boost your competitiveness. Mixed at a 1:1 volume ratio, it expands into closed-cell foam (density 0.11-0.16 g/cm³) in 10 minutes, reaching Shore 00 hardness 25 for low-clamping-pressure sealing. Certified by ISO 9001, it works reliably from -50°C to 200°C with 9% compression set (tested at 70°C), making it ideal for automotive components and electronics housings.
Rapid Ambient Curing: Takes 10 minutes for initial set and 24 hours for full cure (at 25°C/50% RH).
Ozone-Friendly Formula: Uses physical foaming technology to avoid ozone-depleting agents.
Strong Chemical Resistance: Endures oils, coolants, and pH 3-9 media for over 10 years of service.
Excellent Elastic Recovery: Over 90% shape recovery to adapt to ±1.5mm structural tolerances.
Wide Temperature Adaptability: Keeps elasticity stable from -50°C to 200°C.
Automotive: Engine cover gaskets and headlight seals (compliant with VW TL 52411).
Electronics: IP68-rated waterproofing solutions for sensor housings.
Appliances: Door seals for dishwashers and ovens that resist 100°C steam.
Printing: Cushion layers for tile-printing rollers with over 5,000 hours of solvent resistance.
Type | Two-part RTV silicone foam |
Appearance | Part A: Off-white; Part B: Clear |
Mix Ratio (Volume) | 1:1 |
Density (Cured) | 0.11-0.16 g/cm³ |
Shore Hardness | Shore 00 25 |
Working Time (25°C) | >10 minutes |
Full Cure Time | 24 hours (25°C/50% RH) |
Service Temperature | -50°C to 200°C |
Compression Set | 9% (70°C/22h, post-cured) |
Shelf Life | 360 days (sealed, 5-30°C) |
Packaging | 20kg/dual-component kit |
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China