kSil® GP450
kSil® GP450 is a closed cell, lightweight silicone sponge with a density of 440 kg/m³ and a compression force deflection of 100 kPa. It is rated for service from -60°C to +230°C and features an exceptionally low compression set of 2% and a tensile strength of 1500 kPa. Water absorption is less than 5%, and the material is available in thicknesses from 1.5 mm to 8.0 mm.
Key Properties
- Compression Force Deflection: 100 kPa (ASTM D1056)
- Tensile Strength: 1500 kPa (ASTM D412)
- Elongation: 130% (ASTM D412)
- Compression Set: 2% (ASTM D1056)
- Density: 440 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 | 440 kg/m³ | ASTM D1056 |
| Minimum Thickness | 1.50 mm | — |
| Maximum Thickness | 8.00 mm | — |
| Colors Available | White, Black, Riox | Visual |
Mechanical Properties
| Property | Value | Test Method |
| Compression Force Deflection | 100 kPa | ASTM D1056 |
| Compression Set | 2% | ASTM D1056 |
| Tensile Strength | 1500 kPa | ASTM D412 |
| Elongation | 130% | ASTM D412 |
| Water Absorption | <5% | ASTM D1056 |
Thermal Properties
| Property | Value | Test Method |
| Min Operating Temperature | -60°C | — |
| Max Operating Temperature | 230°C | — |
- Die-cut gaskets requiring firm compression resistance combined with exceptionally low long-term compression set
- Flexible sealing solutions in extreme-temperature environments up to 230°C
- Aerospace sealing applications requiring a high-density closed cell silicone sponge
- Automotive sealing components subject to high compressive loads in thermally demanding environments
- Water contact sealing applications where low water absorption and high tensile strength are required
Common industries: Aerospace, Automotive, Industrial Manufacturing, Water Infrastructure.
kSil® GP450 is a high-density grade in the kSil® GP general purpose closed cell silicone sponge range. At 440 kg/m³ and 100 kPa compression force deflection, it delivers a firm, highly resilient response suited to demanding sealing applications in extreme temperature environments. It is formulated for die-cut gaskets and flexible sealing solutions where very high mechanical performance and minimal permanent deformation are required.
The GP450 achieves a compression set of 2% per ASTM D1056, shared with the GP530 grade and representing the lowest value in the GP cellular range. Tensile strength of 1500 kPa and elongation of 130% reflect a high-performance mechanical profile. Water absorption is less than 5%, consistent with its closed cell construction. The available thickness range of 1.5 mm to 8.0 mm is narrower than lower-density GP grades, positioning GP450 for thinner, high-performance sealing applications. The material is available in White, Black, and Riox colorways.
What differentiates GP450 from GP400 and GP530 in the kSil® GP cellular sponge range?
GP450 offers a compression force deflection of 100 kPa and a tensile strength of 1500 kPa — firmer and stronger than GP400 (76 kPa CFD, 750 kPa tensile) while sitting below the GP530 in both density and CFD. Its 2% compression set matches the GP530 grade, making it one of the highest-performing grades in the range for elastic recovery. The thickness range of 1.5 mm to 8.0 mm positions it for thinner, high-performance sealing applications.
Why is compression set critical for cellular silicone sponge materials?
Compression set measures the permanent deformation that remains after a material has been held under compressive load. In sealing applications, a material with a high compression set will progressively lose contact pressure against mating surfaces, ultimately compromising seal integrity. GP450's compression set of 2% per ASTM D1056 is among the lowest in the GP cellular range, indicating outstanding resistance to permanent deformation over the service life of the seal.
What is the operating temperature range for GP450?
GP450 is rated from -60°C to +230°C.
Is GP450 suitable for regulated environments?
No compliance standards are specified on the manufacturer's TDS for GP450. Suitability for regulated environments must be confirmed through application-specific testing.
How should GP450 be specified?
Specify grade (GP450), thickness, color (White, Black, or Riox), compliance requirements, dimensional tolerances, and finished format.
