ASTM D750-12 (R2021) pdf free download.Standard Practice for Rubber Deterioration Using Artificial Weathering Apparatus.
1.1 This practice covers specific variations in the test conditions and procedures that shall he applicable when Practice G 151 plus either Practice G 152, G 153, G 154, or G 155 are employed for exposure of vulcanized rubber compounds. It also covers the preparation of test specimens and the evaluation of results.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3 This standard does not puiport 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.
1 .4 This international standard was developed in accordance with internationally recognized principles on standardizat ion established in the Decision on Principles for the Dei’elopmnemit of International Standards, Guides and Recoinmendalions issued by the World Trade Organ izatiomi Technical Barriers to Trade (TBT,) Committee.
3. Significance and Use
3.1 This practice describes procedures to use in determining the effects of an open-flame carbon-arc light source, an enclosed carbon-arc light source, a xenon-arc light source, or a fluorescent UV source along with heat and moisture on rubber specimens held in a jig or holder with or without a specified strain. The purpose is to attempt to accelerate the effects produced by light, heat, and moisture in the natural environment Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. The Significance and Use section in Practice G 151 and the standard for the appropriate apparatus, that is, Practices G 152, G 153, G 154, or G155 should be consulted for additional information on significance and use of the exposure tests.
3.2 The primary criterion used in estimating resistance to weathering is the percentage decrease in tensile strength and in elongation at break. A supplementary criterion for estimating resistance to weathering is the observed extent of surface crazing and cracking.
3.3 Results obtained by use of these test procedures should not be represented as equivalent to those of any natural exposure test until the degree of quantitative correlation has been established for the material in question.
3.4 Because of differences in the spectral power distribulions of the CXOSUC SOUfCCS as well as the other conditions in the different types of laboratory weathering tests, the different procedures may not result in the same performance rankings or types of failure modes of the materials.ASTM D750 pdf download.