ASTM F955-15 (R2021) pdf free download.Standard Test Method for Evaluating Heat Transfer Through Materials for Protective Clothing Upon Contact with Molten Substances.
1.1 This test method covers the evaluation of materials’ thermal resistance to heat transfer when exposed to a molten substance pour.
1.1.1 This test method was validated using molten substances of aluminum, brass, and iron. The test shall be permitted to be adapted for use with other substances.
1 .2 This test method is applicable to materials from which finished primary protective apparel articles are made.
1.3 This test method does not measure the flammability of materials, nor is it intended for use in evaluating materials exposed to any other thermal exposure.
1.4 Use this test method to measure and describe the properties of materials, products, or assemblies in response to molten substance pour under controlled laboratory conditions and shall not be used to describe or appraise the thermal hazard or fire risk of materials, products, or assemblies under actual conditions. However, it is acceptable to use results of this test as elements of a thermal risk assessment which takes into account all the factors that are pertinent to an assessment of the thermal hazard of a particular end use.
1 .5 This standard does 1101 purport to address all of the safety concerns, if any, associated with if 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.
Specific hazard statements are given in Section 8.
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 break-open—in testing thermal protective material, a response evidenced by the formation of a hole in the material which allows the molten substance to pass through the male-
3.1.2 charring—the formation of carbonaceous residue as the result of pyrolysis or incomplete combustion.
3.1.3 dripping—a material response evidenced by flowing of the polymer.
3.1.4 emhrittlement—the formation of a brittle residue as the result of pyrolysis or incomplete combustion.
3.1 .5 hecit flux—the thermal intensity indicated by the amount of energy transmitted divided by area and time, W/m2 .
3. 1 .6 human tissue burn tolerance (heat tolerance)—in the testing of thermal protective materials, the amount of thermal energy predicted to cause a second-degree burn injury in human tissue.ASTM F955 pdf download.