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This specification covers a two-part flowable space grade silicone rubber room temperature vulcanizing (RTV) adhesive or compound. This specification provides material requirements and testing procedures to differentiate between the physical, mechanical, electrical, and adhesive bonding properties of three types of RTV silicone rubber compounds. RTV low volatile silicone rubber compounds shall be classified as type I, type II, and type III. The silicone rubber material shall be tested for specific gravity, resin weight, viscosity, humidity, work life, tensile shear strength, tensile strength, elongation, dielectric strength, dielectric constant, volume resistivity, outgassing characteristics, total mass loss, volatile condensable material, and storage life.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 The specification covers a two-part flowable space grade room temperature vulcanizing (RTV) silicone rubber adhesive or compound. The material is specifically designed for applications requiring extreme low temperature, low outgassing and minimal volatile condensibles under extreme operating conditions. The RTV silicone rubber should be suitable for withstanding environmental exposure to temperatures from –115 to 200°C (–175 to 392°F). The material should also withstand the combination of stress, temperature, and relative humidity expected to be encountered in service. The RTV silicone rubber may be used as a sealing, caulking, potting or bonding material for applications on metal, plastics, rubber, glass, and ceramic products. Types I and II are often used as coatings.
1.2 The values stated in SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
1.3 The following precautionary statement refers to the test method portion only, Section This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. , of this specification:
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
National Aeronautics and Space Administration (NASA)GSFC RP 1124 Outgassing Data for Selecting Spacecraft Materials JSC SP-R-0022 General Specification, Vacuum Stability Requirement of Polymeric Material for Spacecraft Application Unless otherwise indicated, copies of the above documents are available from a NASA installation library or document repository.
B209 Specification for Aluminum and Aluminum-Alloy Sheet and Plate
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D257 Test Methods for DC Resistance or Conductance of Insulating Materials
D412 Test Methods for Vulcanized Rubber and Thermoplastic ElastomersTension
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D907 Terminology of Adhesives
D1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal)
D1084 Test Methods for Viscosity of Adhesives
D2240 Test Method for Rubber PropertyDurometer Hardness
D2651 Guide for Preparation of Metal Surfaces for Adhesive Bonding
D3951 Practice for Commercial Packaging
E595 Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment
ICS Number Code 83.060 (Rubber)
UNSPSC Code 12352315(Liquid silicone rubber LSR)
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ASTM D6411 / D6411M-99(2020), Standard Specification for Silicone Rubber Room Temperature Vulcanizing Low Outgassing Materials, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top