kSil® US30
kSil® US30 is an ultra-soft solid silicone elastomer with an exceptionally high elongation of 800% — no durometer value is listed on the manufacturer’s TDS for this grade. It achieves a tensile strength of 9 MPa and a compression set of 19% after 24 hours at 150°C. The material meets multiple aerospace, food contact, and automotive compliance standards including AA-59588, FAR 25.853 Horizontal, FDA 21 CFR 177.2600, BfR XV, EC 1935/2004, and FMVSS 302.
Key Properties
- Tensile Strength: 9 MPa (ISO 37 Type 2)
- Elongation: 800% (ISO 37 Type 2)
- Compression Set, 24 Hours @ 150°C: 19% (ISO 815, 24h @150°C)
- Tear Strength: 18 N/mm (ASTM D624 Die B)
- Thermal Conductivity: 0.24 W/m·°C (ASTM C518)
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- Specifications
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- General Info
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Physical Properties
| Property | Value | Test Method |
| Thermal Conductivity | 0.24 W/m·°C | ASTM C518 |
| Colors Available | Red-orange, Grey | Visual |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength | 9 MPa | ISO 37 Type 2 |
| Elongation | 800% | ISO 37 Type 2 |
| Tear Strength | 18 N/mm | ASTM D624 Die B |
| Compression Set — 24 Hours @ 150°C | 19% | ISO 815, 24h @150°C |
Compliance
- AA-59588 — Compliant
- FAR 25.853 Horizontal — Compliant
- FDA 21 CFR 177.2600 — Compliant
- BfR XV — Compliant
- EC 1935/2004 — Compliant
- FMVSS 302 — Compliant
- Highly flexible gaskets and seals requiring maximum material elongation and compliance
- Food contact components in processing and packaging equipment
- Aerospace sealing applications requiring FAR 25.853 Horizontal and AA-59588 compliance
- Automotive sealing components requiring FMVSS 302 compliance
- Applications where extreme stretch capability is the primary material selection criterion
Common industries: Aerospace, Automotive, Food Processing, Industrial Manufacturing.
kSil® US30 is the softest grade in the kSil® US solid silicone series. While no Shore A durometer value is recorded on the manufacturer’s TDS, the grade is described as ultra-soft and is distinguished by its exceptionally high elongation of 800% — the highest in the US solid silicone range. It is designed for highly flexible gasket and sealing applications where maximum material compliance and stretch are required alongside broad regulatory approval.
The material achieves a tensile strength of 9 MPa and a tear strength of 18 N/mm, both tested per standard methods, and exhibits a compression set of 19% after 24 hours at 150°C per ISO 815. Thermal conductivity is 0.24 W/m·°C per ASTM C518. US30 is available in red-orange and grey colorways.
Compliant with AA-59588, FAR 25.853 Horizontal, FDA 21 CFR 177.2600, BfR XV, EC 1935/2004, and FMVSS 302.
What differentiates US30 from other grades in the kSil® US solid silicone series?
US30 is the ultra-soft grade in the US series and is distinguished by its exceptionally high elongation of 800% — the highest recorded in the range. No Shore A durometer value is listed on the manufacturer's TDS for this grade. It is the appropriate choice when maximum flexibility and material compliance are the primary design requirements.
Why is compression set critical for solid silicone elastomers like US30?
Compression set measures how well a solid silicone recovers its original thickness after sustained compressive loading at elevated temperature. In gasket and sealing applications, excessive compression set means the material will permanently deform and lose contact pressure against mating surfaces over time. US30 exhibits a compression set of 19% after 24 hours at 150°C per ISO 815.
What is the operating temperature range for US30?
No discrete operating temperature range is specified on the manufacturer's TDS for US30. The compression set test condition is 150°C. Contact H-O Products for service temperature guidance specific to your application.
Is US30 suitable for food contact or regulated environments?
Yes. US30 is compliant with FDA 21 CFR 177.2600, BfR XV, and EC 1935/2004 for food contact applications. It is also compliant with AA-59588 and FAR 25.853 Horizontal for aerospace, and FMVSS 302 for automotive environments.
How should US30 be specified?
Specify grade (US30), thickness, color (Red-orange or Grey), compliance requirements, dimensional tolerances, and finished format.
