Ultra-Low Compression Set Silicone Sponge Extrusions
expanSil™ XR
Ultra-low compression set silicone sponge extrusions engineered for long-life sealing in demanding environments
expanSil™ XR is an ultra-low compression set, closed-cell silicone sponge extrusion family designed for demanding sealing applications that require extended service life. Through our preferred supplier relationship, SRP helps customers identify the right XR grade and source the material for environments where dependable sealing performance must be maintained over time.
Formulated for applications requiring extreme temperature resistance and long-term durability, expanSil XR is a strong fit when seal replacement is difficult, impractical, or costly. The family also provides excellent resistance to ozone, UV, and weathering, making it well suited for outdoor enclosures, lighting, and other harsh operating environments.
Why Choose expanSil™ XR
expanSil XR combines closed-cell silicone sponge sealing performance with ultra-low compression set for applications where long-term sealing reliability is a key design requirement. It is a strong fit when service life, environmental durability, and resistance to permanent set matter more than a broad-use material approach.
- Ultra-low compression set silicone sponge extrusion family
- Operating temperature range from -60°C to 230°C (-76°F to 446°F)
- Excellent resistance to ozone, UV, and environmental exposure
- UL94 HB horizontal burn rating
- Meets FAR 25 / JAR 25 (Horizontal) flame test requirements
- Designed for applications requiring long service life
- Available in multiple firmness levels to match sealing force requirements
- Low water absorption
- Offered as cords, profiles, strips, and sections
- Available with pressure-sensitive adhesive (PSA), joined rings, and gaskets
- Capable of meeting ASTM D1056 2D classifications, depending on grade
Common Applications for expanSil™ XR
expanSil XR is commonly considered for applications that need dependable closed-cell sealing performance over extended service life, especially where maintenance access is limited or seal replacement is difficult.
- LED lighting enclosures
- Sealing applications where replacement is difficult or impractical
- Long-life environmental sealing
- High-temperature sealing applications
- Outdoor enclosures and equipment
- Applications requiring ultra-low compression set performance
Available XR Grades
expanSil XR is available in multiple firmness levels to support different sealing-force and compression requirements. Review the options below to find the best fit for your application.
Need Help Sourcing the Right expanSil™ XR Grade?
Tell us about your application, operating temperature, sealing geometry, environmental exposure, service-life expectations, and any current material or part number you are replacing. SRP can help narrow the right XR grade and support the sourcing process through our preferred supplier.
Share your application details, performance requirements, existing part information, or a drawing, and our team will review your request and follow up with next steps.
Helpful details to include: application, temperature range, required sealing force, environmental exposure, desired format, service-life requirements, existing grade, or drawing.
RELATED BLOGS
Need Help Sourcing expanSil™ XR?
Tell us about your application, operating temperature, sealing geometry, environmental exposure, service-life expectations, and any current material or part number you are replacing. SRP can help narrow the right XR grade and support the sourcing process through our preferred supplier.