ASTM_C_1795_-_17.pdf

Designation:C179517Standard Test Methods forHigh-Temperature Characterization of Gypsum Boards andPanels1This standard is issued under the fixed designation C1795;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods describe three bench top test meth-ods for measuring the thermophysical responses of gypsumboards and panels when exposed to high temperatures.The testmethods are:1.1.1 High-temperature Core CohesionThis test methodevaluates the ability of the test specimen to withstand aspecified mechanical strain while exposed to elevated tempera-ture.1.1.2 High-temperature ShrinkageThis test method evalu-ates dimensional changes in the test specimen when exposed toelevated temperatures.1.1.3 High-temperature Thermal InsulationThis testmethod evaluates the rate of heat transfer through the thicknessof the test specimen by measuring the length of time requiredto heat the center of the test specimen over a specifiedtemperature rise when exposed to prescribed furnace condi-tions.1.2 The test methods appear in the following order:Test MethodSectionHigh-temperature Core Cohesion4High-temperature Shrinkage5High-temperature Thermal Insulation61.3 UnitsThe values stated in either inch-pound units orSI units(given in parenthesis)are to be regarded separately asstandard.The values stated in each system may not be exactequivalents;therefore,each system shall be used independentlyof the other.Combining values from the two systems mayresult in non-conformance with the standard.1.4 While these tests are useful for evaluating fire propertiesof gypsum boards and panels,they are not suitable forpredicting the Test Methods E119 fire resistance performanceof a specific gypsum protected assembly that has not previ-ously been tested in accordance with Test Methods E119 andcorrelated to these tests.21.5 This standard is used to measure and describe theresponse of materials,products,or assemblies to heat andflame under controlled conditions,but does not by itselfincorporate all factors required for fire hazard or fire riskassessment of the materials,products,or assemblies underactual fire conditions.1.6 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.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsE119 Test Methods for Fire Tests of Building Constructionand MaterialsE631 Terminology of Building Constructions2.2 Other Standards:EN 520 Gypsum PlasterboardsDefinitions,Requirementsand Test Methods3.Terminology3.1 GeneralRefer to Terminologies C11 and E631 forstandard terminology on gypsum and related buildingmaterials,systems and building construction.3.2 Definitions of Terms Specific to This Standard:1This test method is under the jurisdiction ofASTM Committee C11 on Gypsumand Related Building Materials and Systems and is the direct responsibility ofSubcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved June 1,2017.Published June 2017.Originallyapproved in 2005.Last previous edition approved in 2015 as C1795 15.DOI:10.1520/C1795-17.2Shipp,P.H.,and Yu,Q.,“Thermophysical Characterization of Type X SpecialFire Resistant Gypsum Board,”Proceedings of the Fire and Materials 2011Conference,San Francisco,Jan.1,2011 Feb.2,2011,Interscience Communica-tions Ltd.,London,UK,pp 417-426.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.1 Thermal Insulation Index(TI),na single value indexthat denotes the rate of heating at the center of the ThermalInsulation Test specimen as determined by the elapsed time tothe nearest minute for the temperature to rise from 104 to392F(40 to 200C).4.High-temperature Core Cohesion4.1 Summary of Test MethodThe high-temperature corecohesion of gypsum panel products is evaluated by applying ashear force and bending moment to a cantilev