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This specification covers the general requirements for materials used in rubber seals of concentrating solar collectors. Design requirement pertains only to permissible deflections of the rubber during thermal expansion or contraction of the seal in use and the tolerances in dimensions of molded and extruded seals. The materials shall be classified according to usage: Type C and Type W; according to degrees of hardness: Grade 2; 3; 4; 5; 6; 7; and 8. The seals shall be classified as: Class PS and Class SC. Desert outdoor exposure and xenon arc laboratory exposure shall be performed to determine the resistance to solar radiation. The following test methods shall be performed: ultimate elongation; compression set; resistance to heating; resistance to ozone; resistance to low temperature; and adhesion loss.
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.
Significance and Use
1.1 This specification covers the general requirements for materials used in rubber seals of concentrating solar collectors. Particular applications may necessitate other requirements that would take precedence over these requirements when specified.
1.2 Design requirement pertains only to permissible deflections of the rubber during thermal expansion or contraction of the seal in use and the tolerances in dimensions of molded and extruded seals.
1.3 This specification does not include requirements pertaining to the fabrication or installation of the seals.
1.4 The values stated in SI units are to be regarded as the standard.
1.5 The following safety hazards caveat pertains only to the test methods portion, Section 9, of this specification: 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C661 Test Method for Indentation Hardness of Elastomeric-Type Sealants by Means of a Durometer
C717 Terminology of Building Seals and Sealants
C719 Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
D395 Test Methods for Rubber Property--Compression Set
D412 Test Methods for Vulcanized Rubber and Thermoplastic Elastomers--Tension
D865 Test Method for Rubber--Deterioration by Heating in Air (Test Tube Enclosure)
D1149 Test Methods for Rubber Deterioration--Cracking in an Ozone Controlled Environment
D1229 Test Method for Rubber Property--Compression Set at Low Temperatures
D1349 Practice for Rubber--Standard Temperatures for Testing
D1415 Test Method for Rubber Property--International Hardness
D1566 Terminology Relating to Rubber
D2137 Test Methods for Rubber Property--Brittleness Point of Flexible Polymers and Coated Fabrics
D2240 Test Method for Rubber Property--Durometer Hardness
D3182 Practice for Rubber--Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
D3183 Practice for Rubber--Preparation of Pieces for Test Purposes from Products
G7 Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials
Other StandardsRMAHandbook— Rubber Products: Molded, Extruded, Lathe Cut, and Cellular Available from the Rubber Manufacturers Association (RMA), 444 Madison Ave., New York, NY 10022.
ICS Number Code 21.140 (Seals, glands)
UNSPSC Code 31410000(Seals)