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Home » Products » Silicone Foam Sealing Strip – High-Temp Waterproof Gasket for Electronics & Automotive

Silicone Foam Seal Strip

Silicone foam sealing strip
silicone foam sealing strip
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waterproof gasket material

Silicone Foam Sealing Strip – High-Temp Waterproof Gasket for Electronics & Automotive

  • Premium closed-cell silicone foam sealing strips with self-adhesive backing.
  • Perfect for waterproof (IP68), dustproof, and thermal sealing applications.
  • Withstands extreme temperatures from -60°C to +200°C.
  • UL 94 V-0 certified.
  • Custom sizes and die-cutting available.
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A silicone foam sealing strip is a versatile, soft, and compressible gasket material made from silicone rubber processed into a closed-cell foam structure. It is commonly supplied in rolls or strips with a strong self-adhesive backing for easy peel-and-stick installation.

This material is engineered to create a reliable, long-lasting seal against dust, water, air, and moisture. Its closed-cell design means the tiny bubbles inside are sealed, preventing liquids and gases from passing through the material itself. Unlike ordinary rubber or open-cell foam, it offers excellent compression recovery—meaning it bounces back to its original shape after being compressed, maintaining a tight seal over years of use.

The key advantage of silicone foam is its exceptional performance in extreme conditions. It operates reliably in temperatures ranging from -60°C to over 200°C, resisting degradation from UV exposure, ozone, and harsh weather. It is also flame retardant (often UL 94 V-0 certified), making it safe for demanding applications.

silicone foam sealing strip for automotive LED lights
waterproof closed cell silicone foam tape for outdoor electrical enclosures
low compression set silicone foam weather seal for curtain wall installation

Material Properties

  • Material Grade: Premium Silicone Rubber Foam

  • Cell Structure: 100% Closed-Cell

  • Color Options: Black (standard), White, Gray, Custom Colors

  • Temperature Range: -60°C to +200°C (continuous)

  • Short-term Exposure: Up to 230°C for 2 hours

  • Flame Rating: UL 94 V-0 Certified

  • Compression Set: <20% (ASTM D395, 22hrs @ 70°C)

  • Density Range: 220-480 kg/m³ (customizable)

  • Tensile Strength: 0.8-1.2 MPa

  • Elongation at Break: 200-400%

closed cell foam tape
pressure sensitive adhesive foam

Adhesive System

  • Type: High-tack Acrylic Pressure Sensitive Adhesive (PSA)

  • Alternative: Silicone-based Adhesive (for extreme temp applications)

  • Peel Strength: 18-25 N/25mm (on stainless steel)

  • Service Temp with Adhesive: -40°C to +150°C

  • Release Liner: 80gsm PE Coated Kraft Paper

Standard Sizes & Availability

  • Thickness: 1mm, 2mm, 3mm, 5mm, 10mm (custom 0.5-25mm)

  • Width: 10mm, 15mm, 20mm, 25mm, 50mm (custom 5-500mm)

  • Length: 10m, 25m rolls, or custom cut lengths

  • MOQ: 100 rolls standard sizes, 500m custom sizes

  • Lead Time: 7-15 days standard, 4-6 weeks custom tooling

What is the typical lead time for custom silicone foam strips?

For standard grades, lead time is typically 2-4 weeks. For new custom die-cut tools or special materials, it may take 6-8 weeks. Always confirm timelines with your supplier early in the process. No vulcanization required – Reduces energy consumption and cycle time by 40-60%. 100% recyclability of scrap – Regrind can be reused directly in production, minimizing waste. Design simplification – Enables multi-material overmolding in a single step, eliminating assembly costs. For high-volume production, TPE typically offers a 15-30% overall cost saving despite a higher initial material price.

Can silicone foam strips be painted or color-matched?

Silicone itself is difficult to paint due to its low surface energy. However, strips can be manufactured in various colors (black, white, gray, red) by adding pigments during the compounding process. Discuss color requirements upfront.

What's the difference between "sponge" and "foam" silicone rubber?

In industry terminology, they often refer to the same closed-cell material. "Foam" is a more universally understood term in international procurement. Ensure you specify "closed-cell silicone foam" to avoid confusion with open-cell sponge materials.

Do you provide custom shapes and sizes for specific applications?

Yes, we specialize in customization. We offer: Custom Die-Cutting: Any 2D shape with precision tooling Variable Thickness: 0.5mm to 25mm thickness Special Adhesives: Different adhesive types and strengths Color Matching: Custom colors for branding or visibility Packaging: Custom reel lengths, individually packaged parts Minimum Orders: As low as 500 meters for custom profiles Lead Time: 4-6 weeks for new tooling, with fast turnaround on repeat orders We work directly with your engineering team to provide samples and optimize the design for both performance and cost efficiency.
Yichang Brand Silicone Foam Sealing Strip Self adhesive Silicone Rubber #siliconerubber #rubber

Silicone foam strips are used wherever a reliable, durable seal is needed in challenging conditions.

  • Electronics & Electrical Enclosures: Sealing control panels, junction boxes, LED lights, and outdoor telecom cabinets against dust and water (often to IP ratings).

  • Automotive: Sealing engine compartments, LED headlights/taillights, battery covers, and HVAC systems against heat, fumes, and noise.

  • Appliances: Gaskets for ovens, heaters, dishwashers, and other high-temperature appliances.

  • HVAC & Ducting: Sealing connections in high-temperature air handling systems.

  • Construction & Glazing: Weatherproofing seals for windows, doors, and curtain walls in demanding architectural projects.

  • Aerospace & Transportation: Used in cabins, doors, and panels where fire safety and temperature extremes are critical.

  • Medical Equipment: Sealing for sterilizable equipment and imaging devices due to its cleanliness and stability.

automotive weather seal

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