kSil™ KSV005 Medium-Firm
Medium-Firm UL94 V-0 Flame Resistant Closed-Cell Silicone Sponge
kSil™ KSV005 is a medium-firm, lightweight closed-cell silicone sponge with a density of 28.1 lb/ft³ and a compression stress of 14.5 psi at 25% strain per ASTM D1056, available in seven thicknesses from 1/8″ to 1″. The material achieves UL94 V0 at 1.5 mm, passes EN45545-2 (HL3), NFPA 130, FAR 25 Appendix F Sec A 1 (i) & (ii), CS 25 Appendix F Sec A 1 (i) & (ii), Bombardier SMP 800c, and Airbus ABD0031, with a compression set of 3% at 22 hours, 212°F, 50% per ASTM D1056 and a service range of -76°F to 446°F continuous.
Key Properties
- Compression Stress 25% Strain: 14.5 psi (ASTM D1056)
- Tensile Strength: 97.8 psi (BSENISO 1798, ASTM D412)
- Elongation to Failure: 90% (BSENISO 1798, ASTM D412)
- Compression Set, 22 Hours @ 212°F, 50%: 3% (ASTM D1056)
- Density: 28.1 lb/ft³ (BSENISO 845, ASTM D3574)
- High Temperature Resistance: 446°F
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 1/8″, 3/16″, 1/4″, 3/8″, 1/2″, 3/4″, 1″ | — |
| Color | Gray (standard), Black | — |
| Cell Structure | Closed Cell | — |
| Material/Substrate | Silicone Sponge | — |
| Density | 28.1 lb/ft³ | BSENISO 845, ASTM D3574 |
| Brittle Point | -80°C (-112°F) | ASTM D746 |
| Radiation Resistance | >10⁵ Grays (10⁷ Rads) typical | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Stress 25% Strain | 14.5 psi | ASTM D1056 |
| Compression Stress 40% Strain | 32.6 psi | BSENISO 3386 part 1,2 |
| Tensile Strength | 97.8 psi | BSENISO 1798, ASTM D412 |
| Elongation to Failure | 90% | BSENISO 1798, ASTM D412 |
| Compression Set, 22 Hours @ 158°F, 50% | <1% | BSENISO 1856 |
| Compression Set, 22 Hours @ 212°F, 50% | 3% | ASTM D1056 |
| Water Absorption | <1% | ASTM D1056 |
Thermal Properties
| Property | Value | Test Method |
| Low Temperature Resistance | -76°F | — |
| High Temperature Resistance | 446°F | — |
| Intermittent Temperature Resistance | 482°F | — |
| Thermal Conductivity | 0.138 W/m·K | DIN EN993-15 |
Flame & Fire Performance
| Property | Value | Test Method |
| FAR 25 Appendix F Sec A 1 (i) & (ii) (Minimum) | 1.5 mm | FAR 25 APP. F SEC A 1 (i) |
| UL94V0 | 1.5 mm | — |
| EN45545-2 (HL3) | Pass | — |
| NFPA 130 | Pass | — |
| Bombardier – SMP 800c | Pass | — |
| Airbus – ABD0031 | Pass | — |
| ASTM D1056 2D1 | Pass | — |
| FMVSS 302 | Pass | — |
| FAR 25 Appendix F Sec A 1 (i) & (ii) | Pass | — |
| CS 25 Appendix F Sec A 1 (i) & (ii) | Pass | — |
Environmental Performance
| Property | Value | Test Method |
| Ozone Resistant | Yes | — |
| Oxidation Resistant | Yes | — |
| UV Resistant | Yes | — |
| Corona Discharge Resistant | Yes | — |
| Cosmic Radiation Resistant | Yes | — |
| Ionising Radiation Resistant | Yes | — |
| Weather Resistant | Yes | — |
EN45545-2 Classifications
| Property | Description | Rating |
| R22 | Interior seals (& non-listed interior products <0.2m²) (2 mm – 25 mm thickness range) | HL3 |
| R23 | Exterior Seals (& non-listed exterior products <0.2m²) (2 mm – 25 mm thickness range) | HL3 |
Compliance
- UL94 V0 — Compliant (1.5 mm)
- EN45545-2 (HL3) — Compliant (Pass)
- NFPA 130 — Compliant (Pass)
- Bombardier SMP 800c — Compliant (Pass)
- Airbus ABD0031 — Compliant (Pass)
- ASTM D1056 2D1 — Compliant (Pass)
- FMVSS 302 — Compliant (Pass)
- FAR 25 Appendix F Sec A 1 (i) & (ii) — Compliant (Pass)
- CS 25 Appendix F Sec A 1 (i) & (ii) — Compliant (Pass)
- Flame resistant environmental sealing in rail, aerospace, automotive, marine, and military assemblies requiring IP67 sealing capability and the full kSil™ compliance suite at the firmest available grade in the series
- High-closure-force gaskets in enclosures where softer kSil™ grades cannot maintain adequate sealing pressure under the applied flange load
- Aerospace sealing and gasketing components requiring FAR 25, CS 25, and Airbus ABD0031 compliance at 14.5 psi compression stress in thicknesses from 1/8″ to 1″
- Interior and exterior seal gaskets in rail applications requiring EN45545-2 R22 and R23 HL3 compliance in a firm, dimensionally stable closed-cell sponge
- General flame resistant sealing across automotive, marine, and industrial markets where FMVSS 302 and UL94 V0 are required and greater resistance to deflection under load is the primary selection criterion
Common industries: Rail, aerospace, automotive, marine, military, electronics, HVAC, lighting.
kSil™ KSV005 is the firmest grade in the kSil™ V-0 series at 28.1 lb/ft³ and 14.5 psi compression stress at 25% strain, with the highest tensile strength in the series at 97.8 psi. The smooth-skin closed-cell construction provides sealing capability to IP67.
Available in seven thicknesses from 1/8″ to 1″, it is suited to environmental sealing, gasketing, and cushioning in rail, aerospace, automotive, marine, military, electronics, HVAC, and lighting applications where higher closure force resistance is required. EN45545-2 classifications cover R22 and R23 at HL3 for interior and exterior seals in the 2 mm–25 mm thickness range.
The material achieves a compression set of 3% at 22 hours, 212°F, 50% per ASTM D1056, and <1% at 158°F per BSENISO 1856. Thermal conductivity is 0.138 W/m·K per DIN EN993-15 — the highest in the kSil™ series. Brittle point is -80°C (-112°F) per ASTM D746. Radiation resistance is >10⁵ Grays (10⁷ Rads) typical. The material is resistant to ozone, oxidation, UV, corona discharge, cosmic radiation, ionising radiation, and weather. No limiting oxygen index or smoke/toxicity test data is listed on this TDS.
Compliant with UL94 V0 (1.5 mm), EN45545-2 (HL3), NFPA 130, Bombardier SMP 800c, Airbus ABD0031, ASTM D1056 2D1, FMVSS 302, FAR 25 Appendix F Sec A 1 (i) & (ii), and CS 25 Appendix F Sec A 1 (i) & (ii).
What differentiates kSil™ KSV005 from other grades in the kSil™ V-0 series?
KSV005 is the firmest and densest grade in the kSil™ V-0 series at 28.1 lb/ft³ and 14.5 psi compression stress at 25% strain — requiring more closure force to compress than any other grade in the series. It also achieves the highest tensile strength in the series at 97.8 psi and the highest thermal conductivity at 0.138 W/m·K. EN45545-2 classifications are R22 and R23 at HL3. Like KSV004, no limiting oxygen index or smoke/toxicity data is listed on this TDS.
Why is compression set critical for a medium-firm flame resistant silicone sponge used in high-closure-force sealing?
Medium-firm grades are installed under higher flange loads than softer grades and must maintain their geometry and sealing contact force through sustained thermal and mechanical loading. Compression set determines whether the sponge springs back to provide the required contact force when the assembly thermally cycles or when flange loads redistribute. A permanently set sponge loses the sealing force advantage of the firmer grade, reducing both IP67 integrity and the flame and smoke barrier performance required by EN45545-2 and FAR 25 classifications. KSV005's compression set of 3% at 22 hours, 212°F, 50% per ASTM D1056 confirms reliable recovery across its rated service conditions.
Is kSil™ KSV005 suitable for regulated aerospace, automotive, and rail environments?
Yes. KSV005 passes UL94 V0 (1.5 mm), EN45545-2 (HL3), NFPA 130, FAR 25 Appendix F Sec A 1 (i) & (ii), CS 25 Appendix F Sec A 1 (i) & (ii), Bombardier SMP 800c, Airbus ABD0031, ASTM D1056 2D1, and FMVSS 302, as listed on the TDS.
How should kSil™ KSV005 be specified?
Specify grade (KSV005), thickness (from the seven available gauges), color (Gray or Black), applicable compliance requirements, dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
What is the service temperature range for kSil™ KSV005?
Low temperature resistance is -76°F, high temperature resistance is 446°F, and intermittent temperature resistance is 482°F, as listed on the TDS.
