(R) Rubber: Silicone Rubber (PVMQ) Low Outgassing, Low Temperature Resistant 45 - 55 Shore “A” Hardness For Seals in Space and Vacuum Service
|Publication Date:||1 February 2019|
This specification covers a Silicone (PVMQ) Rubber compound in the form of molded rings.
Primarily for use in interplanetary space and other hard vacuums from -103 to +302 °F (-75 to +150 °C), with a minimum of condensable outgassing products. While within the earth's atmosphere, the silicone rubber compound is resistant to deterioration by ozone, smog, and weathering. Seals conforming to this specification are intended for use in electrical connectors, components, assemblies, and vehicle segments on the external configuration of spacecraft, where no condensation can be tolerated on critical surfaces (windows, optics, thermal control coatings, etc.) when such critical surfaces may be as cold as 73 °F (23 °C) and the seal may be as hot as 302 °F (150 °C).
The use of materials that are deemed acceptable in accordance with this specification does not ensure that the system or component will remain uncontaminated. Therefore, subsequent functional, developmental, and qualification tests should be used, as necessary, to ensure that the material's performance is satisfactory for its intended use. Seals for man-inhabited areas of spacecraft may require additional testing and approval. It is the responsibility of the user to determine that this specification is appropriate for the environments (temperature range, fluids exposure, etc.) in which it is sought to be used. Order of Precedence Nothing in this document supersedes applicable laws and regulations unless a specific exemption has been obtained. This specification is in addition to and in no way limiting, superseding, or abrogating any contractual obligation as required by the applicable procurement document. In the event of conflict in requirements, the order of precedence shall be:
1. Procurement Document or Contractual Agreement (excluding this document)
2. Applicable purchaser's drawing
3. Specification referenced on the drawing
4. This document
5. All specifications referenced in this document
Safety - Hazardous Materials
While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved