ASTM_F_955_-_15.pdf

Designation:F95515Standard Test Method forEvaluating Heat Transfer through Materials for ProtectiveClothing Upon Contact with Molten Substances1This standard is issued under the fixed designation F955;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the evaluation of materialsthermal resistance to heat transfer when exposed to a moltensubstance pour.1.1.1 This test method was validated using molten sub-stances of aluminum,brass,and iron.The test shall bepermitted to be adapted for use with other substances.1.2 This test method is applicable to materials from whichfinished primary protective apparel articles are made.1.3 This test method does not measure the flammability ofmaterials,nor is it intended for use in evaluating materialsexposed to any other thermal exposure.1.4 Use this test method to measure and describe theproperties of materials,products,or assemblies in response tomolten substance pour under controlled laboratory conditionsand shall not be used to describe or appraise the thermal hazardor fire risk of materials,products,or assemblies under actualconditions.However,it is acceptable to use results of this testas elements of a thermal risk assessment which takes intoaccount all the factors that are pertinent to an assessment of thethermal hazard of a particular end use.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in Section 8.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesE457 Test Method for Measuring Heat-Transfer Rate Usinga Thermal Capacitance(Slug)CalorimeterF1002 Performance Specification for Protective Clothingand Materials for Use by Workers Exposed to SpecificMolten Substances and Related Thermal HazardsF1494 Terminology Relating to Protective Clothing3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 break-openin testing thermal protective material,aresponse evidenced by the formation of a hole in the materialwhich allows the molten substance to pass through the mate-rial.3.1.2 charringthe formation of carbonaceous residue asthe result of pyrolysis or incomplete combustion.3.1.3 drippinga material response evidenced by flowingof the polymer.3.1.4 embrittlementthe formation of a brittle residue asthe result of pyrolysis or incomplete combustion.3.1.5 heat fluxthe thermal intensity indicated by theamount of energy transmitted divided by area and time,W/m2(cal/cm2s).3.1.6 human tissue burn tolerance(heat tolerance)in thetesting of thermal protective materials,the amount of thermalenergy predicted to cause a second-degree burn injury inhuman tissue.3.1.7 ignitionthe initiation of combustion.3.1.8 meltinga material response evidenced by softeningof the polymer.3.1.9 primary protective clothingprotective clothing de-signed to be worn for work activities during which significantexposure to molten substance splash,radiant heat,and flame islikely to occur.3.1.9.1 DiscussionPrimary protective clothing is used inwork activities that include charging,tapping,and pouring,during which work is carried out in close proximity to moltensubstances and hot surfaces where contact with either is likely.3.1.10 response to molten substance pourin testing ther-mal protective material,the observed effect of molten sub-stance contact on textile properties or deterioration of thematerial.1This test method is under the jurisdiction ofASTM Committee F23 on PersonalProtective Clothing and Equipment and is the direct responsibility of SubcommitteeF23.80 on Flame and Thermal.Current edition approved July 1,2015.Published July 2015.Originally approvedin 1985.Last previous edition approved in 2007 as F955 07.DOI:10.1520/F0955-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.11 shrinkagea decrease in one or more dimensions ofan object or material.3.1.12 thermal end pointin the testing of thermal protec-tive materials,the point where the copper slug calorimetersensor response(heat energy measured)intersects with apredicted skin burn injury model.3.2 For definitions of other textile terms used in this testmethod,refer to Terminology D123.4.Summary of Test Method4.1 Amaterial specimen is mounted on a vertical incline andis exposed to a mo