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Standard Practice for Rubber Deterioration Using Artificial Weathering Apparatus
NORMA vydaná dňa 1.5.2021
Označenie normy: ASTM D750-12(2021)
Dátum vydania normy: 1.5.2021
Kód tovaru: NS-1028664
Počet strán: 4
Približná hmotnosť: 12 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
enclosed carbon arc, filtered open flame carbon arc, filtered xenon arc, rubber products, ultraviolet and ultraviolet/visible light aging, weathering,, ICS Number Code 83.060 (Rubber)
|Significance and Use|
3.1This 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 and the standard for the appropriate apparatus, that is, Practices , , , or should be consulted for additional information on significance and use of the exposure tests.
3.2The 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.
3.3Results 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.
3.4Because of differences in the spectral power distributions of the exposure sources 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. Comparisons shall not be made of relative stabilities of materials exposed in different types of apparatus.
3.5When conducting exposures in devices that use laboratory light sources, it is important to consider how well the artificial weathering conditions will reproduce property changes and failure modes caused by end-use environments on the materials being tested.
3.6Practices , , , , and recommend that a similar material of known performance (a control) be exposed simultaneously with the test specimen to provide a standard for comparative purposes. Preferably, a control material known to have poor durability as well as one that has good durability should be used. The reason for using a control is that reproducibility in ranking stabilities is usually better than reproducibility of absolute changes. Therefore, the use of controls is particularly important when test materials are not being compared with one another.
1.1This practice covers specific variations in the test conditions and procedures that shall be applicable when Practice plus either Practice , , , or are employed for exposure of vulcanized rubber compounds. It also covers the preparation of test specimens and the evaluation of results.
1.2The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3This 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.
1.4This 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|
Posledná aktualizácia: 2022-07-01 (Počet položiek: 2 574 846)
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