高低温试验箱ASTM D1149-07标准来源：本站 发布时间：2018-11-02 18:20:00 阅读：170
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ASTM D1149是关于橡胶暴露在一定的程度的含氧环境下，静态或者动态表面拉伸情况下的性能变化的标准，标准后续所带的数字为标准新修改被采用的年份。出于版权保护原因，本文仅摘抄部分ASTM D1149-07英文标准，如需完整ASTM D1149-07内容请购买请垂询客服人员。
1.1 These test methods are used to estimate the effect of exposure, under surface tensile strain conditions, either dynamic or static, in an atmosphere containing specified levels of ozone concentration, expressed as partial pressure (refer to Note 1), on vulcanized rubber, rubber compounds, molded or extruded soft rubber, and other specified materials, or as may be determined empirically. The effect of naturally occurring sunlight or light from artificial sources is excluded.
1.2 Previously published ASTM documents Test Method D 518 and Test Methods D 3395 have been included in these test methods, D 1149, in 2007. Please refer to Note 2.
1.2.1 Test Method D 518 and Test Methods D 3395 have henceforth been withdrawn and superseded by Test Methods D 1149. When Test Methods D 1149 is cited, or otherwise referenced, a notation shall be included to this effect. Please refer to section for the appropriate references.
1.3 The specified conditions of exposure to ozone in the controlled environments are accelerated in comparison to outdoor exposure. These accelerated ozone test methods may not give results which correlate with outdoor exposure tests or service performance.
1.4 All materials, instruments, or equipment used for the determination of mass, force, dimension, ozone concentration, partial pressure, temperature, velocity, and gas exchange rate shall have direct traceability to the National Institute for Standards and Technology, or other internationally recognized organization parallel in nature.
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. Many of the stated SI units are direct conversions from the U.S. Customary System to accommodate the instrumentation, practices, and procedures that existed prior to the Metric Conversion Act of 1975.
This standard involves hazardous materials, specifically ozone. It may also involve hazardous operations and equipment. 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.
A discussion and explanation regarding the measurement of ozone concentrations based upon parts of ozone per unit of air versus partial pressure is provided in Test Methods D 4575, specifically Appendices X1 and X2. Test Methods D 4575 is also recommended as a source of background information regarding standards involving materials exposed to ozone.
2. Referenced Documents
D518 Test Method for Rubber Deterioration--Surface Cracking
D1171 Test Method for Rubber DeteriorationSurface Ozone Cracking Outdoors (Triangular Specimens)
D1349 Practice for Rubber--Standard Conditions for Testing
D3182 Practice for RubberMaterials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
D3395 Test Methods for Rubber Deterioration--Dynamic Ozone Cracking in a Chamber
D4482 Test Method for Rubber Property--Extension Cycling Fatigue
D4575 Test Methods for Rubber DeteriorationReference and Alternative Method(s) for Determining Ozone Level in Laboratory Test Chambers
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