ASTM C870热绝缘材料调整标准规范

ASTM C870 Standard Practice for Conditioning of Thermal Insulating Materials
ASTM C870 热绝缘材料调整标准规范

The conditioning prescribed in this recommended practice is designed to obtain reproducible test results on thermal insulating materials. Results of tests obtained on these materials under uncontrolled atmospheric conditions are not comparable with each other. Some of the physical properties of thermal insulating materials are influenced by relative humidity and temperature in a manner that affects the results of tests. In this regard, such information is provided in pertinent material specifications and test methods by stating the physical properties relative to the specific ambient or test conditions.
Note 1—In some cases (for example, dimensionally unstable materials), the dry mass cannot easily be established and original mass has to be used.

1. Scope
1.1 This practice covers the conditioning of thermal insulating materials for tests. Since prior exposure of insulating materials to high or low humidity will affect the equilibrium moisture content, a procedure is also given for preconditioning the materials.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 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)
ASTM Standards
ASTM C168 Terminology Relating to Thermal Insulation
ASTM E41 Terminology Relating To Conditioning
ASTM E171 Specification for Atmospheres for Conditioning and Testing Flexible Barrier Materials
ASTM E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
ISO Standard
ISO544 Standard Atmospheres for Conditioning and/or Testing
Index Terms
conditioning; preconditioning; thermal insulating materials; Cellular thermal insulation; Conditioning; Insulating materials; Mineral fiber insulation; Preconditioning; Thermal insulating materials;

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 來源：防火網　發布時間：12/25/2013 點擊次數：1323