kSil® GP250
kSil® GP250 is a closed cell, lightweight silicone sponge with a density of 235 kg/m³ and a compression force deflection of 34 kPa. It is rated for service from -60°C to +230°C and exhibits a compression set of 12% and water absorption of less than 5%. The material is available in thicknesses from 1.5 mm to 45 mm, the widest thickness range in the kSil® GP cellular sponge range.
Key Properties
- Compression Force Deflection: 34 kPa (ASTM D1056)
- Tensile Strength: 600 kPa (ASTM D412)
- Elongation: 145% (ASTM D412)
- Compression Set: 12% (ASTM D1056)
- Density: 235 kg/m³ (ASTM D1056)
- Operating Temperature Range: -60°C to +230°C
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Density | 235 kg/m³ | ASTM D1056 |
| Minimum Thickness | 1.50 mm | — |
| Maximum Thickness | 45.00 mm | — |
| Colors Available | White, Black, Riox | Visual |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection | 34 kPa | ASTM D1056 |
| Compression Set | 12% | ASTM D1056 |
| Tensile Strength | 600 kPa | ASTM D412 |
| Elongation | 145% | ASTM D412 |
| Water Absorption | <5% | ASTM D1056 |
Thermal Properties
| Property | Value | Test Method |
| Min Operating Temperature | -60°C | — |
| Max Operating Temperature | 230°C | — |
| Recommended Application Temperature | 150°C to 300°C | — |
| Recommended Application Pressure | 0 MPa to 10 MPa | — |
- Die-cut gaskets requiring improved elastic recovery and mid-range compression resistance
- Flexible sealing solutions across a wide operating temperature range
- Aerospace sealing applications requiring a closed cell silicone sponge
- Automotive sealing components in high-temperature under-hood or body environments
- Water contact sealing applications where low water absorption is required
Common industries: Aerospace, Automotive, Industrial Manufacturing, Water Infrastructure.
kSil® GP250 is an intermediate-density grade in the kSil® GP general purpose closed cell silicone sponge range. With a density of 235 kg/m³ and compression force deflection of 34 kPa, it occupies the mid-range between the softer GP200 and the firmer GP350 and GP400 grades. It is formulated for die-cut gaskets, flexible sealing solutions, and environments requiring reliable performance across extreme temperature ranges and where environmental resistance is necessary.
GP250 provides a tensile strength of 600 kPa, elongation of 145%, and a compression set of 12% per ASTM D1056 — lower than the GP200 grade, indicating improved long-term elastic recovery. Water absorption is less than 5%, consistent with its closed cell construction. Recommended application temperatures range from 150°C to 300°C, with application pressures from 0 MPa to 10 MPa. The material is available as sheets and rolls with a standard width of 1 m (39″), and a Pressure Sensitive Adhesive (PSA) option is available.
What differentiates GP250 from GP200 and GP350 in the kSil® GP cellular sponge range?
GP250 sits between GP200 and GP350 in both density (235 kg/m³) and compression force deflection (34 kPa). Its compression set of 12% is notably lower than GP200 (20%), offering better long-term seal recovery. Compared to GP350, it is softer and lighter, suiting applications that need moderate compliance with improved recovery over the GP200 grade.
Why is compression set critical for cellular silicone sponge materials?
Compression set measures how much permanent deformation remains after a material has been held under compressive load. In gasket and sealing applications, excessive compression set causes the material to lose contact force against mating surfaces over time, resulting in seal failure. GP250 has a compression set of 12% per ASTM D1056, making it more resistant to permanent set than the GP200 grade.
What is the operating temperature range for GP250?
GP250 is rated from -60°C to +230°C.
Is GP250 suitable for regulated environments?
No compliance standards are specified on the manufacturer's TDS for GP250. Suitability for regulated environments must be confirmed through application-specific testing.
How should GP250 be specified?
Specify grade (GP250), thickness, color (White, Black, or Riox), PSA option if required, compliance requirements, dimensional tolerances, and finished format.
