1、AMERICAN NATIONAL WBSTANDARDMV ANSI/ASTM D 250-IT Standard Specification for ASPHALT-SATURATED ASBESTOS FELT USED IN ROOFING AND WATERPROOFING1 This Standard is issued under the fixed designation D 250;the number immediately following the designation inriicates the year of original adoption or,in th
2、e case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.NOTE 1The title was editorially changed in February 1978.NOTE 2Table 1 was corrected editorially in January 1979.1.Scope 1.1 This specification covers asphalt-satu-rated asbestos felts,with or
3、without perfora-tions,for use with asphalts conforming to the requirements of Specification D 312 in the construction of built-up roofs,and with as-phalts conforming to the requirements of Specification D 449 in the membrane system of waterproofing.NOTE The values stated in SI units are to be regard
4、ed as the standard.2.Applicable Documents 2.1 ASTM Standards:D146 Sampling and Testing Bitumen-Satu-rated Felts and Fabrics Used in Roofing and Waterproofing2 D312 Specification for Asphalt Used in Roofing2 D449 Specification for Asphalt Used in Dampproofing and Waterproofing2 D 1079 Definitions of
5、Terms Relating to Roofing,Waterproofing,and Bituminous Materials2 2.2 Federal Standard:Fed.Std.No.123 Marking for Domestic Shipment(Civilian Agencies)3 2.3 Military Standards:*MIL-R-3423 Packaging of Roofing Felt in Rolls MIL-STD-129 Marking for Shipment and Storage 2.4 American Trucking Association
6、,Inc.:National Motor Freight Classification5 2.5 Uniform Classification Committee:Uniform Freight Classification6 3.Classification 3.1 Asphalt-saturated asbestos felts cov-ered by this specification are of two types:3.1.1 Type/-Nominal 730 g/m2(15 lb/square),plain or perforated.3.1.2 Type/-Nominal 1
7、460 g/m2(30 lb/square),plain only.4.Definitions 4.1 For definitions of terms such as felt,built-up roofing,and square,see Defini-tions D 1079.4.2 For the purpose of sampling,a lot shall consist of the same type and size of roofing felt offered for delivery at one time.5.Ordering Information 5.1 Orde
8、rs for material purchased under this specification shall include the following:5.1.1 Designation of this specification,5.1.2 Type of material(3.1),and whether plain or perforated,1 This specification is under the jurisdiction of ASTM Committee D-8 on Roofing,Waterproofing,and Bituminous Materials.Cu
9、rrent edition approved July 1,1977.Published Sep-tember 1977.Originally published as D 250-26 T.Last previous edition D 250-70.2 Annual Book of ASTM Standards,Part 15.3 Available from General Services Administration,Washington,D.C.20402.4 Available from Naval Publications and Forms Center,5801 Tabor
10、 Ave.,Philadelphia,Pa.19120.5 Available from American Trucking Association,Inc.,1616 P St.N.W.,Washington,D.C.20036.6 Available from Uniform Classification Committee,212 Union Station,Chicago,111.60606.263 NOTICE:This standard has either been superseded and replaced by a new version or withdrawnCont
11、act ASTM International(www.astm.org)for the lastest informationD250 5.1.3 Quantity of rolls,5.1.4 Special sampling,inspection,and certification procedures,if required,and 5.1.5 Special packaging,packing,and marking procedures(13.3 and 13.5),if re-quired.6.Materials and Manufacture 6.1 The felt shall
12、 be produced from at least 85%by mass of asbestos fiber.The surface of the felt shall be uniform and relatively smooth.Upon splitting or tearing on the bias,the felt shall appear reasonably free of lumps.6.2 In the process of manufacture,a single thickness of asbestos felt shall be saturated with an
13、 asphaltic saturant.7.Physical Requirements 7.1 Asphalt-saturated asbestos felt shall neither crack nor be so sticky as to cause tearing or other damage upon being unrolled at ambient temperatures above 10C(50F).7.2 The material shall conform to the phys-ical requirements prescribed in Table 1 and t
14、he dimensions and masses prescribed in Ta-ble 2.7.3 Plain and perforated felts shall con-form to the same requirements as the imper-forate(plain)type except that the perfora-tions shall be uniformly spaced.8.Workmanship,Finish,and Appearance 8.1 The felt shall be thoroughly and uni-formly saturated,
15、and shall show no unsatu-rated spots at any point upon cutting 50-mm(2-in.)wide strips at random across the entire sheet and splitting them open for their full length.8.2 The surface of the felt shall not be coated or covered with talc or other substance that would tend to interfere with adhesion be
16、tween the felt and plying cement.8.3 The finished material shall be free of visible external defects,such as holes,ragged or untrue edges,breaks,cracks,tears,protu-berances and indentations,except for inten-tionally provided perforations and the associ-ated protuberances.9.Sampling and Test Methods 9.1 Sample the material and determine the properties enumerated in this specification in accordance with Methods D 146.9.2 Determine the openness of the perfo-rations in saturated felts by the followi
