Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

DOW SILASTIC 8257 Defoamer

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.

Product Information of DOW SILASTIC 8257 Defoamer

  1. Rapid Ambient Curing: Takes 10 minutes for initial set and 24 hours for full cure (at 25°C/50% RH).

  2. Ozone-Friendly Formula: Uses physical foaming technology to avoid ozone-depleting agents.

  3. Strong Chemical Resistance: Endures oils, coolants, and pH 3-9 media for over 10 years of service.

  4. Excellent Elastic Recovery: Over 90% shape recovery to adapt to ±1.5mm structural tolerances.

  5. Wide Temperature Adaptability: Keeps elasticity stable from -50°C to 200°C.

Areas of Application of DOW SILASTIC 8257 Defoamer

  1. Automotive: Engine cover gaskets and headlight seals (compliant with VW TL 52411).

  2. Electronics: IP68-rated waterproofing solutions for sensor housings.

  3. Appliances: Door seals for dishwashers and ovens that resist 100°C steam.

  4. Printing: Cushion layers for tile-printing rollers with over 5,000 hours of solvent resistance.

Specifications Of DOW SILASTIC 8257 Defoamer

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


Get in Touch with ERICW
Let competitive chemical materials go global.

Your Name *

Your Email *

Your Phone

Country

Your Message *