1、Designation: D 4990 97a (Reapproved 2005)e1Standard Specification forCoal Tar Glass Felt Used in Roofing and Waterproofing1This standard is issued under the fixed designation D 4990; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEEditorially switched from English dominant to SI dominant in March 2005.1. Scope1.1 This specification covers g
3、lass felt impregnated withcoal tar intended to be used with coal tar pitch conforming tothe appropriate requirements of Specification D 450 in 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 value
4、s 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 user
5、of this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D 146 Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven Fabrics for Roofing and Wa-terproofing
6、D 450 Specification for Coal-Tar Pitch Used in Roofing,Dampproofing, and WaterproofingD 1079 Terminology Relating to Roofing, Waterproofing,and Bituminous Materials3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminology D 1079.3.2 Definitions of Terms
7、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
8、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 manufac
9、ture, 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 materia
10、l 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 a
11、nd 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 After extraction of the coal-tar in accordance withSection 16 of Test Methods D 146, the desaturated felt shallremain flat and unb
12、uckled, 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 1C (77 6 2F) for at least 1 h and tested in a roommaintained at the same temperature (immersion in water notrequired). Otherwise
13、, follow Test Methods D 146, 14.1 insection on Pliability.7. Workmanship, Finish, and Appearance7.1 The finished material shall be uniformly impregnatedwith coal tar of uniform thickness, and shall be free of visibledefects such as ragged or untrue edges, breaks, cracks, tears1This specification is
14、under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.04on Felts and Fabrics.Current edition approved March 1, 2005. Published March 2005. Originallyapproved in 1989. Last previous edition approved in 1997 as D 4990 97a.2For ref
15、erenced 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, We
16、st Conshohocken, PA 19428-2959, United States.and 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 bepermitted, provided that no more than five such holes are foundin
17、 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 MethodsD 146, except for the net dry mass of coal tar impregnatedglass felt.8.2 Net Dry Mass of Coal Tar Coated Glass FeltsCut arepresen
18、tative sample from the full width of each sample roll asdescribed in Section 10 of Test Methods D 146. Suspend thesamples 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 Tes
19、t Methods D 146. Then weigh each sample offelt and calculate the individual and average net dry mass perunit area.8.3 AshDetermine ash by ignition at 538 6 14C (1000 625F) for not less than 10 min.9. Inspection9.1 InspectionInspection shall be in accordance with therequirements of this specification
20、.9.2 Inspection AlternativesAlternative inspection require-ments shall be determined by and as agreed upon between thepurchaser and the supplier.10. Rejection and Resubmittal10.1 Failure to ConformFailure to conform to any of therequirements as stated in this specification constitutes groundsfor rej
21、ection.10.2 Rejection RedressThe supplier shall have the right toinspect the rejected materials. The supplier and the purchasershall 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 Packag
22、e Marking11.1 Unless otherwise agreed upon between the supplier andpurchaser, each product package shall be plainly marked 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 ba
23、nded in amanner that completely encircles the roll and will preventslipping or unrolling.11.3 No roll shall contain more than 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
24、 built-up roofs; coal tar; glass felt; waterproofingASTM International takes no position respecting the validity of any patent 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 rig
25、hts, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision 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
26、 revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments 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
27、 you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted 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
28、 be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Physical Properties of Coal Tar Glass FeltBreaking Strength,Amin, kN/M (lbf/in.) Type 1Longitudinal (with the fiber grain
29、) 7.7 (44)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
30、faces of the machine.TABLE 2 Dimensions and Masses of Coal Tar Glass FeltType 1Width of roll, mm (in.), or as agreed betweenpurchaser and supplier914 (36) 6 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 f
31、t2), minAverage 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.D 4990 97a (2005)e12
