kSil® V-0 70
kSil® V-0 70 is a 70 Shore A solid silicone elastomer specifically formulated to meet stringent flame, rail, and mass transit standards, with a tensile strength of 10.2 MPa and an elongation of 320%. It carries UL 94 V-0, EN 45545, NFPA 130, FAR 25.853 Horizontal and Vertical, and FMVSS 302 compliance. The material is available in grey only.
Key Properties
- Durometer: 70 Shore A (ISO 48-4)
- Tensile Strength: 10.2 MPa (ISO 37 Type 2)
- Elongation: 320% (ISO 37 Type 2)
- Compression Set, 24 Hours @ 150°C: 20% (ISO 815, 24h @150°C)
- Tear Strength: 19 N/mm (ASTM D624 Die B)
- Thermal Conductivity: 0.24 W/m·°C (ASTM C518)
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Thermal Conductivity | 0.24 W/m·°C | ASTM C518 |
| Colors Available | Gray | Visual |
Mechanical Properties
| Property | Value | Test Method |
| Durometer | 70 Shore A | ISO 48-4 |
| Tensile Strength | 10.2 MPa | ISO 37 Type 2 |
| Elongation | 320% | ISO 37 Type 2 |
| Tear Strength | 19 N/mm | ASTM D624 Die B |
| Compression Set — 24 Hours @ 150°C | 20% | ISO 815, 24h @150°C |
Compliance
- UL 94 V-0 — Compliant
- EN 45545 — Compliant
- NFPA 130 — Compliant
- FAR 25.853 Horizontal — Compliant
- FAR 25.853 Vertical — Compliant
- FMVSS 302 — Compliant
- Rail and mass transit sealing components requiring EN 45545 and NFPA 130 compliance
- Aerospace sealing applications requiring FAR 25.853 compliance in both horizontal and vertical orientations
- Automotive sealing components requiring FMVSS 302 compliance
- UL 94 V-0 rated enclosures and fire-rated assemblies requiring a firm solid silicone elastomer
- Fire-rated gaskets and seals in transportation and mass transit infrastructure
Common industries: Rail and Mass Transit, Aerospace, Automotive, Electrical and Electronics.
kSil® V-0 70 is a specially formulated 70 Shore A solid silicone elastomer in the kSil® range, designed specifically to satisfy the most demanding flame, rail, and mass transit regulatory requirements. Unlike general purpose solid silicone grades, V-0 70 is formulated to achieve UL 94 V-0 flame rating alongside EN 45545 rail compliance and NFPA 130 mass transit compliance simultaneously — a combination described on the TDS as making it one of the most broadly fire-rated grades in the kSil® range. It is available in grey only.
V-0 70 achieves a tensile strength of 10.2 MPa — the highest tensile strength among the kSil® solid silicone grades covered on this TDS — with an elongation of 320% and a tear strength of 19 N/mm. Compression set is 20% after 24 hours at 150°C per ISO 815. Thermal conductivity is 0.24 W/m·°C per ASTM C518. The material covers both horizontal and vertical FAR 25.853 flame orientations and is also compliant with FMVSS 302 for automotive applications.
Compliant with UL 94 V-0, EN 45545, NFPA 130, FAR 25.853 Horizontal and Vertical, and FMVSS 302.
What differentiates V-0 70 from other 70 Shore A solid silicone grades in the kSil® range?
V-0 70 is specifically formulated to achieve UL 94 V-0 flame rating alongside EN 45545 rail compliance, NFPA 130 mass transit compliance, and coverage of both FAR 25.853 Horizontal and Vertical orientations — a combination not carried by the general purpose US70 grade. It also achieves a higher tensile strength of 10.2 MPa compared to US70's 8 MPa, and is available in grey only rather than multiple colors.
Why is compression set critical for solid silicone elastomers like V-0 70?
Compression set measures the permanent deformation remaining after a material has been held under compressive load at elevated temperature. In fire-rated sealing applications — particularly rail, aerospace, and mass transit — a gasket must maintain contact pressure over the service life of the assembly to ensure the seal remains effective. V-0 70 exhibits a compression set of 20% after 24 hours at 150°C per ISO 815.
What is the operating temperature range for V-0 70?
No discrete operating temperature range is specified on the manufacturer's TDS for V-0 70. The compression set test condition is 150°C. Contact H-O Products for service temperature guidance specific to your application.
Is V-0 70 suitable for flame-rated or regulated environments?
Yes. V-0 70 carries UL 94 V-0 flame rating, EN 45545 rail compliance, NFPA 130 mass transit compliance, FAR 25.853 Horizontal and Vertical aerospace compliance, and FMVSS 302 automotive compliance, making it suited for the most demanding fire-rated sealing environments.
How should V-0 70 be specified?
Specify grade (V-0 70), thickness, compliance requirements, dimensional tolerances, and finished format. Note: this grade is available in gray only.
