ASTM_D_4990_-_97a_2020.pdf

Designation:D499097a(Reapproved 2020)Standard Specification forCoal-Tar Glass Felt Used in Roofing and Waterproofing1This standard is issued under the fixed designation D4990;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 This specification covers glass felt impregnated withcoal-tar intended to be used with coal-tar pitch conforming tothe appropriate requirements of Specification D450/D450M inconstruction of built-up roofs and in the construction ofwaterproofing systems.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 The following safety hazards caveat pertains only to theTest Methods portion,Section 8,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.4 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:2D146/D146M Test Methods for Sampling and TestingBitumen-Saturated Felts and Woven Fabrics for Roofingand WaterproofingD450/D450M Specification for Coal-Tar Pitch Used inRoofing,Dampproofing,and WaterproofingD1079 Terminology Relating to Roofing and Waterproofing3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1079.3.2 Definitions of Terms Specific to This Standard:3.2.1 net dry massthe mass of the coal-tar-impregnatedglass felt exclusive of wrapping and packing material,afterdrying to constant weight and after removing all detachedcomminuted surfacing material as described in 8.2.4.Classification4.1 Coal-tar-impregnated glass felt covered by this specifi-cation is of one type.5.Materials and Manufacture5.1 The felt shall be a thin,porous sheet of uniformlydistributed glass fibers,with or without the addition of rein-forcing stranded glass yarns,and bonded with a water-resistantresinous binder.5.2 In the process of manufacture,the felt shall be impreg-nated with coal-tar which shall be permitted to contain amineral stabilizer so that the individual glass fibers are coatedand the coal-tar is evenly distributed throughout.5.3 The impregnated glass felt shall be surfaced lightly witha suitable finely comminuted material to prevent sticking in theroll.The nature and quantity of the surfacing material shall notinterfere with adhesion between the plies of a membrane.6.Physical Properties,Dimensions,and Masses6.1 The material shall conform to the physical properties,dimensions,and masses prescribed in Tables 1 and 2.6.2 The finished product shall not crack nor be so sticky asto cause tearing or other damage upon being unrolled attemperatures between 10 and 60 C(50 and 140 F).6.3 After extraction of the coal-tar in accordance withSection 16 of Test Methods D146/D146M,the desaturated feltshall remain flat and unbuckled,shall retain its original shapeand dimensions,and individual fibers shall remain firmly set inplace.6.4 The pliability specimen shall be conditioned in air at 256 1 C(77 6 2 F)for at least 1 h and tested in a roommaintained at the same temperature(immersion in water not1This specification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.04on Felts,Fabrics and Bituminous Sheet Materials.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 1989.Last previous edition approved in 2013 as D4990 97a(2013).DOI:10.1520/D4990-97AR20.2For 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 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.required).Otherwise,follow Test Methods D146/D146M,14.1in section on Pliability.7.Workmanship,Finish,and Appearance7.1 The finished material shall be uniformly impregnatedwith coal-tar of uniform th