Low Outgassing Silicone Sheeting
Low Outgassing Silicone Sheeting is a solid silicone elastomer specifically formulated and post-cured to minimize the release of volatile compounds under vacuum and/or elevated temperature conditions. The material meets ASTM E595 outgassing requirements with Total Mass Loss (TML) ≤1.00% and Collected Volatile Condensable Material (CVCM) ≤0.10%, meeting the criteria of NASA-STD-6016 for low-outgassing materials. Available in 40, 50, 60, and 70 Shore A durometer grades, it is peroxide free, odorless, and tasteless, with an operating range of -85°F to +525°F (intermittent).
Key Properties
- Durometer, Shore “A”: 40 ±5 to 70 ±5 (four grades) — ASTM D2240
- Tensile Strength, psi: 1100–1250 (varies by grade) — ASTM D412
- Elongation, %: 650–900 (varies by grade) — ASTM D412
- Tear, ppi Die “B”: 175–200 (varies by grade) — ASTM D624
- Total Mass Loss (TML): ≤1.00% — ASTM E595
- Service Temperature: -85°F to +525°F (intermittent)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Test Method | 40 Duro | 50 Duro | 60 Duro | 70 Duro |
| Specific Gravity, g/cc | ASTM D297 | 1.10 | 1.13 | 1.15 | 1.19 |
| Durometer, Shore “A” | ASTM D2240 | 40 ±5 | 50 ±5 | 60 ±5 | 70 ±5 |
| Tensile Strength, psi | ASTM D412 | 1100 | 1200 | 1250 | 1250 |
| Elongation, % | ASTM D412 | 900 | 900 | 750 | 650 |
| Tear, ppi Die “B” | ASTM D624 | 200 | 175 | 180 | 200 |
Outgassing Performance
| Property | Test Method | Value (All Grades) |
| Total Mass Loss (TML) | ASTM E595 | ≤1.00% |
| Collected Volatile Condensable Material (CVCM) | ASTM E595 | ≤0.10% |
Compliance
- ASTM E595 — Compliant (TML ≤1.00%, CVCM ≤0.10%)
- NASA-STD-6016 — Compliant
- FDA Title 21 CFR 177.2600 — Compliant
- Spacecraft and satellite seals and gaskets requiring ASTM E595 and NASA-STD-6016 compliance
- Aerospace and defense optical and sensor system sealing where volatile condensation on lenses or sensors is unacceptable
- Electronics and semiconductor enclosure sealing in vacuum environments where outgassed siloxanes could cause contact or PCB contamination
- Medical device and pharmaceutical processing seals where volatile migration into sterile or analytical environments must be controlled
- Precision optical instrument sealing in microscopes, laser systems, and satellite optical assemblies
Common industries: Aerospace, spacecraft, defense, electronics, semiconductors, medical devices, precision optics.
Low Outgassing Silicone Sheeting is a solid silicone elastomer product line engineered for high-vacuum and elevated-temperature environments where the release of volatile compounds from the sealing material would contaminate sensitive adjacent components.
The material is specifically formulated and post-cured to reduce residual volatile content to the levels required by ASTM E595 — the NASA-developed test standard for Total Mass Loss and Condensable Volatile Materials in vacuum environments. Low Outgassing Silicone Sheeting meets TML ≤1.00% and CVCM ≤0.10% across all four durometer grades, satisfying the NASA-STD-6016 criteria for low-outgassing materials used in spacecraft and aerospace programs.
The material is peroxide free, odorless, and tasteless, and is supplied in continuous rolls or cut sheets in thicknesses from .005″ to .500″.
Low Outgassing Silicone Sheeting is available in standard widths of 36″ and 48″ with custom widths up to 62″, and in standard cut sheet sizes of 12×12″, 24×24″, 36×36″, and 48×48″. Mechanical performance across the four grades is strong: tensile strength reaches 1,100–1,250 psi, elongation ranges from 650% to 900%, and tear resistance ranges from 175 to 200 ppi Die “B”.
The material is UV and ozone resistant and operates across a broad -85°F to +525°F (intermittent) temperature range. Beyond spacecraft applications, Low Outgassing Silicone Sheeting’s low-outgassing chemistry makes it suitable for electronics and semiconductor enclosures, precision optical instruments, and medical device or pharmaceutical environments where volatile migration is a concern.
Compliant with ASTM E595 (TML ≤1.00%, CVCM ≤0.10%), NASA-STD-6016, and FDA Title 21 CFR 177.2600.
What differentiates Low Outgassing Silicone Sheeting from standard solid silicone sheeting grades?
Low Outgassing Silicone Sheeting is specifically formulated and post-cured to remove the low-molecular-weight siloxanes and residual volatile compounds that standard silicone elastomers contain. This post-cure process reduces Total Mass Loss to ≤1.00% and Collected Volatile Condensable Material to ≤0.10% per ASTM E595 — limits that standard silicone grades do not meet. In vacuum or elevated-temperature environments, the volatile compounds present in standard silicone can condense on adjacent optical surfaces, sensors, or electronics, causing contamination or performance degradation that Low Outgassing Silicone Sheeting is designed to prevent.
Why does CVCM matter more than TML in outgassing applications?
Total Mass Loss measures all material lost from a specimen — including water vapor and other substances that may dissipate harmlessly. Collected Volatile Condensable Material measures specifically what condenses on a cooled collector plate — the fraction of outgassed material most likely to deposit on sensitive surfaces such as optical lenses, thermal control coatings, or electronic contacts. Low Outgassing Silicone Sheeting's CVCM ≤0.10% limit directly addresses the contamination risk that makes outgassing critical in spacecraft and precision instrument applications.
What is the operating temperature range for Low Outgassing Silicone Sheeting?
-85°F to +525°F (intermittent), as listed on the TDS.
Is Low Outgassing Silicone Sheeting suitable for spacecraft and NASA-program applications?
Yes. Low Outgassing Silicone Sheeting meets ASTM E595 outgassing requirements (TML ≤1.00%, CVCM ≤0.10%) and satisfies the NASA-STD-6016 criteria for low-outgassing materials used in spacecraft hardware.
How should Low Outgassing Silicone Sheeting be specified?
Specify Low Outgassing Silicone Sheeting, durometer (40, 50, 60, or 70 Shore A), thickness, supply format (continuous roll or cut sheet), width, compliance requirements (ASTM E595, NASA-STD-6016, CFR 177.2600 as applicable), dimensional tolerances, and finished format.
