ASTM D6411-99(R2020) pdf free download
ASTM D6411-99(R2020) pdf free download.Standard Specification for Silicone Rubber Room Temperature Vulcanizing Low Outgassing Materials
1. Scope
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 appli- cations requiring extreme low temperature, low outgassing and minimal volatile condensibles under extreme operating condi- tions. The RTV silicone rubber should be suitable for with- standing 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 8, of this specification: This standard does not purport to address all ofthe safety concerns, ifany, associated with its use. It is the responsibility ofthe user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 Many terms in this specification are defined in Termi- nology D907. 3.1.2 lot, n—a specific material that can be identified by the place of manufacture, quantity and type of raw materials and process conditions used. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 RTV, adj—room temperature vulcanizing. 3.2.2 RTV Silicone Rubber Compound, n—a silicone resin base (A) and a silicone resin curing agent (B) when mixed in a proper ratio results in a rubbery compound. A RTV silicone rubber compound that is manufactured by a unique combina- tion of raw silicone materials and manufacturing process that conforms to a given set of physical and performance properties and is identified by specific name, number, or alphanumeric designation. N OTE 2—A “curing agent” is commonly used with this type of silicone rubber compound. The term “accelerator” or “catalyst” is synonymous with “curing agent.”
7. Test Requirements
7.1 Material—The RTV silicone rubber compound, when tested per Section 8, shall meet the physical, mechanical and electrical, and outgassing requirements as specified in Table 1. The silicone rubber compound shall not have a detrimental effect on surfaces being in contact or bonded over the range of temperatures at which the RTV silicone rubber compounds will be used. 7.2 Qualification—Qualification shall only apply to the formulation on which the qualification tests have been made; any changes by the manufacturer in formulation or method of manufacturing, shall be cause of designating the RTV silicone rubber compound as a new product. The new product shall be given a new code number and shall be requalified and approved until it has been shown to meet the requirements of this specification. 7.3 Working Characteristics: 7.3.1 Application—The RTV silicone rubber compound shall be suitable for application to surfaces in accordance with the manufacturer’s instructions. 7.3.2 Curing—The time, temperature, and pressure used to cure the RTV silicone rubber compound shall be in accordance with the manufacturer’s recommendation.
