kSil™ KSV001 V-0 Super Soft
kSil™ KSV001 is a super soft, lightweight closed-cell silicone sponge with a density of 10.0 lbs/ft³ and a compression stress of 2.8 psi at 25% strain per ASTM D1056, available in six thicknesses from 1/4″ 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 1% 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: 2.8 psi (ASTM D1056)
- Tensile Strength: 24.7 psi (BSENISO 1798, ASTM D412)
- Elongation to Failure: 110% (BSENISO 1798, ASTM D412)
- Compression Set, 22 Hours @ 212°F, 50%: 1% (ASTM D1056)
- Density: 10.0 lbs/ft³ (BSENISO 845, ASTM D3574)
- High Temperature Resistance: 446°F
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Thickness | 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 1″ | — |
| Color | Gray (standard), Black | — |
| Cell Structure | Closed Cell | — |
| Material/Substrate | Silicone Sponge | — |
| Density | 10.0 lbs/ft³ | BSENISO 845, ASTM D3574 |
| Brittle Point | -80°C (-112°F) | ASTM D746 |
| Limiting Oxygen Index | 33.5% | ENO ISO 4589-2: OI |
| Radiation Resistance | >10⁵ Grays (10⁷ Rads) typical | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Stress 25% Strain | 2.8 psi | ASTM D1056 |
| Compression Stress 40% Strain | 6.1 psi | BSENISO 3386 part 1,2 |
| Tensile Strength | 24.7 psi | BSENISO 1798, ASTM D412 |
| Elongation to Failure | 110% | BSENISO 1798, ASTM D412 |
| Compression Set, 22 Hours @ 158°F, 50% | <1% | BSENISO 1856 |
| Compression Set, 22 Hours @ 212°F, 50% | 1% | 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 | 0.064 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) |
| UL94 V0 | 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 | — |
| Surface Flammability Is (Flame Spread Index), 3 mm | 15 | ASTM E162 |
| Surface Flammability Is (Flame Spread Index), 30 mm | 25 | ASTM E162 |
| Smoke Density (Flaming Mode) Ds (1.5 mins), 3 mm | 8 | ASTM E662 |
| Smoke Density (Flaming Mode) Ds (1.5 mins), 30 mm | 11 | ASTM E662 |
| Smoke Density (Flaming Mode) Ds (4.0 mins), 3 mm | 14 | ASTM E662 |
| Smoke Density (Flaming Mode) Ds (4.0 mins), 30 mm | 30 | ASTM E662 |
| Smoke Density (Non-Flaming Mode) Ds (1.5 mins), 3 mm | 5 | ASTM E662 |
| Smoke Density (Non-Flaming Mode) Ds (1.5 mins), 30 mm | 10 | ASTM E662 |
| Smoke Density (Non-Flaming Mode) Ds (4.0 mins), 3 mm | 13 | ASTM E662 |
| Smoke Density (Non-Flaming Mode) Ds (4.0 mins), 30 mm | 29 | ASTM E662 |
| Toxic Gas Generation, 3 mm | Pass | Bombardier SMP 800-C |
| Toxic Gas Generation, 30 mm | Pass | Bombardier SMP 800-C |
| Average Flame Propagation | 1.6 inches | ASTM C1166 |
| Toxicity (CIT nlp) 600°C, 3 mm | 0.04 | NF X 70-100-1 & 2 |
| Toxicity (CIT nlp) 600°C, 50 mm | 0.06 | NF X 70-100-1 & 2 |
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 |
| R10 | Floors and cavity wall (3 mm – 50 mm thickness range) | HL3 |
| R21 | Seating & mattress materials (3 mm – 50 mm thickness range) | HL3 |
| R22 | Interior seals (& non-listed interior products <0.2m²) (2 mm – 25 mm thickness range) | HL3 (3 mm – 50 mm) |
| R23 | Exterior Seals (& non-listed exterior products <0.2m²) (2 mm – 25 mm thickness range) | HL3 (3 mm – 50 mm) |
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)
- Rail car seating, mattress materials, floor, and cavity wall applications requiring EN45545-2 HL3 compliance (R10, R21, R22, R23)
- Interior and exterior sealing in aerospace applications requiring FAR 25, CS 25, and Airbus ABD0031 compliance in a super soft, IP67-capable closed-cell sponge
- Flame resistant environmental seals in automotive, marine, and military assemblies where minimal closure force is available and FMVSS 302 and UL94 V0 compliance is required
- Low-outgassing sealing and cushioning components in electronics, HVAC, and lighting enclosures requiring low smoke index and low toxicity
- Applications requiring the softest grade in the kSil™ V-0 series with IP67 sealing capability and the widest EN45545-2 classification coverage in the series (R10, R21, R22, R23)
Common industries: Rail, aerospace, automotive, marine, military, electronics, HVAC, lighting.
kSil™ KSV001 is the softest and lowest-density grade in the kSil™ V-0 series at 10.0 lbs/ft³, designed for applications requiring maximum compliance under minimal closure force combined with the most stringent international flame, smoke, and toxicity compliance. The smooth-skin closed-cell construction provides sealing capability to IP67.
Available in six thicknesses from 1/4″ to 1″, it is suited to seating and mattress materials, floor and cavity wall applications, and interior and exterior sealing in rail, aerospace, automotive, marine, military, electronics, HVAC, and lighting end uses.
EN45545-2 classifications include R10, R21, R22, and R23 at HL3.
The material achieves a compression set of 1% at 22 hours, 212°F, 50% per ASTM D1056 — the lowest in the kSil™ series — and <1% at 158°F per BSENISO 1856. Thermal conductivity is 0.064 W/m·K per DIN EN993-15. Brittle point is -80°C (-112°F) per ASTM D746. Limiting oxygen index is 33.5% per ENO ISO 4589-2. Radiation resistance is >10⁵ Grays (10⁷ Rads) typical. The material is resistant to ozone, oxidation, UV, corona discharge, cosmic radiation, ionising radiation, and weather.
Surface flammability (flame spread index Is) is 3 mm = 15 and 30 mm = 25 per ASTM E162. Smoke density (flaming mode Ds) at 1.5 min is 3 mm = 8, 30 mm = 11; at 4.0 min is 3 mm = 14, 30 mm = 30 per ASTM E662. Smoke density (non-flaming mode Ds) at 1.5 min is 3 mm = 5, 30 mm = 10; at 4.0 min is 3 mm = 13, 30 mm = 29 per ASTM E662. Toxic gas generation passes at 3 mm and 30 mm per Bombardier SMP 800-C. Average flame propagation is 1.6 inches per ASTM C1166.
Toxicity (CIT nlp) at 600°C is 3 mm = 0.04 and 50 mm = 0.06 per NF X 70-100-1 & 2.
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™ KSV001 from other grades in the kSil™ V-0 series?
KSV001 is the softest and lowest-density grade in the kSil™ series at 10.0 lbs/ft³ and 2.8 psi compression stress at 25% strain — the least force required to compress of any grade in the series. It achieves the lowest compression set in the series at 1% at 22 hours, 212°F, 50% per ASTM D1056. It is the only grade in the kSil™ series carrying EN45545-2 classifications for R10 (floors and cavity wall) and R21 (seating and mattress materials) in addition to R22 and R23. Thickness starts at 1/4" and includes a 5/8" option not available in other grades.
Why is compression set critical for a super soft flame resistant silicone sponge?
Super soft grades operate under the lowest applied loads in the series and are the most susceptible to progressive permanent deformation over time. In sealing applications, a foam that takes a high compression set gradually loses contact force against the mating flange, opening gaps that compromise IP67 sealing performance and the material's function as a flame and smoke barrier. KSV001's compression set of 1% at 22 hours, 212°F, 50% — the lowest in the kSil™ series — confirms that the material maintains its geometry and contact force across its rated service conditions.
What is the service temperature range for kSil™ KSV001?
Low temperature resistance is -76°F, high temperature resistance is 446°F, and intermittent temperature resistance is 482°F, as listed on the TDS.
Is kSil™ KSV001 suitable for regulated aerospace, automotive, and rail environments?
Yes. KSV001 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™ KSV001 be specified?
Specify grade (KSV001), thickness (from the six available gauges), color (Gray or Black), applicable compliance requirements, dimensional tolerances, and finished format (sheet, slit roll, or die-cut component).
