1、Designation: D4990 97a (Reapproved 2013)Standard Specification forCoal Tar Glass Felt Used in Roofing and Waterproofing11. 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 in
2、 con-struction of built-up roofs and in the construction waterproof-ing 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
3、 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 and healthpractices and determine the applicability of regulatory limita-tions prior to use.2
4、. Referenced Documents2.1 ASTM Standards:2D146 Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing andWaterproofingD450 Specification for Coal-Tar Pitch Used in Roofing,Dampproofing, and WaterproofingD1079 Terminology Relating to Roofing and Waterproofing3. Te
5、rminology3.1 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 af
6、ter 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 t
7、he 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
8、 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,
9、 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 60C (50 and 140F).6.3 Af
10、ter extraction of the coal-tar in accordance withSection 16 of Test Methods D146, the desaturated felt shallremain flat and unbuckled, shall retain its original shape anddimensions, and individual fibers shall remain firmly set inplace.6.4 The pliability specimen shall be conditioned in air at 256 1
11、C (77 6 2F) for at least 1 h and tested in a roommaintained at the same temperature (immersion in water notrequired). Otherwise, follow Test Methods D146, 14.1 insection on Pliability.7. Workmanship, Finish, and Appearance7.1 The finished material shall be uniformly impregnatedwith coal tar of unifo
12、rm thickness, and shall be free of visibledefects such as ragged or untrue edges, breaks, cracks, tearsand protuberances. It shall contain closely spaced pinholes notover 0.8 mm (132 in.) in diameter over the entire area of thefelt. Individual holes up to 6.3 mm (14 in.) in diameter shall bepermitte
13、d, provided that no more than five such holes are foundin any 1 m2(1 yd2) of felt.8. Sampling and Test Methods8.1 Sample the material and determine the properties enu-merated in this specification in accordance with Test MethodsD146, except for the net dry mass of coal tar impregnated glassfelt.1Thi
14、s 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 15, 2013. Published May 2013. Originallyapproved in 1989. Last previous edi
15、tion approved in 2005 as D4990 97a (2005)1.DOI: 10.1520/D4990-97AR13.2For 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
16、website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18.2 Net Dry Mass of Coal Tar Coated Glass FeltsCut arepresentative sample from the full width of each sample roll asdescribed in Section 10 of Test Methods D146. Suspend thesampl
17、es vertically and allow them to dry to a constant weightin a laboratory atmosphere of 23 6 2C (73.4 6 3.6F).Remove the detached comminuted surfacing as described inSection 11 of Test Methods D146. Then weigh each sample offelt and calculate the individual and average net dry mass perunit area.8.3 As
18、hDetermine ash by ignition at 538614C (1000625F) for not less than 10 min.9. Inspection9.1 InspectionInspection shall be in accordance with therequirements of this specification.9.2 Inspection AlternativesAlternative inspection require-ments shall be determined by and as agreed upon between thepurch
19、aser and the supplier.10. Rejection and Resubmittal10.1 Failure to ConformFailure to conform to any of therequirements as stated in this specification constitutes groundsfor rejection.10.2 Rejection RedressThe supplier shall have the right toinspect the rejected materials. The supplier and the purch
20、asershall agree to the quantity of rolls deemed unacceptable. Thesupplier shall then have the right to submit the same number ofnew rolls as replacement.11. Packaging and Package Marking11.1 Unless otherwise agreed upon between the supplier andpurchaser, each product package shall be plainly marked
21、withthe suppliers name, the product brand, the ASTM designation,and type of bitumen if not evident in the label name of theproduct.11.2 The rolls shall be securely wrapped or banded in amanner that completely encircles the roll and will preventslipping or unrolling.11.3 No roll shall contain more th
22、an two pieces, and nomore than 3 % of the rolls in any lot shall contain two pieces.If a roll contains a manufacturing splice, the splice shall beclearly marked.12. Keywords12.1 built-up roofs; coal tar; glass felt; waterproofingASTM International takes no position respecting the validity of any pat
23、ent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision
24、 at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comm
25、ents will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighte
26、d by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-m
27、ail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Physical Properties of Coal Tar Glass FeltBreaking Strength,Amin, kN/M (lbf/in.) Type 1Longitudinal (with the fiber grain) 7.7 (44)
28、Transverse (across the fiber grain) 7.7 (44)Pliability 13-mm (12-in.) radius bend no failuresATo prevent the coal tarimpregnated glass felt from slipping from between thejaws of the tension testing machine, insert a thin strip of soft gasket rubberbetween the felt and each of the four jaw faces of t
29、he machine.TABLE 2 Dimensions and Masses of Coal Tar Glass FeltType 1Width of roll, mm (in.), or as agreed betweenpurchaser and supplier914 (36) 0.7 %Area of roll, m2(ft2), min, or as agreed betweenpurchaser and supplier50.17 (540)Net dry mass of coal tar coated glass felt, g/m2(lb/100 ft2), minAver
30、age of all rolls 342 (7.0)Individual rolls 293 (6.0)Parting agent and stabilizer, g/m2(lb/100 ft2),max146 (3.0)Moisture at point of manufacture, max, %A1.0Mass of desaturated glass felt, g/m2(lb/100 ft2),min83 (1.7)Bituminous saturant (coal tar), g/m2(lb/100 ft2),min146 (3.0)Ash, % 70 to 88AAt time of manufacture products with higher moisture content at time ofinstallation may cause hot materials to foam, creating interply voids that may resultin blisters.D4990 97a (2013)2
