ASTM_D_2444_-_99_2010.pdf

Designation:D244499(Reapproved 2010)Standard Test Method forDetermination of the Impact Resistance of ThermoplasticPipe and Fittings by Means of a Tup(Falling Weight)1This standard is issued under the fixed designation D2444;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of the impactresistance of thermoplastic pipe and fittings under specifiedconditions of impact by means of a tup(falling weight).Threeinterchangeable striking noses are used on the tup,differing ingeometrical configuration.Two specimen holders are de-scribed.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and Fittings3.Significance and Use3.1 The impact resistance of thermoplastic pipe and fittingsrelates to suitability for service and to quality of processing.Impact resistance may also provide a relative measure of amaterials resistance to breakage during handling and installa-tion and,for non-buried applications,to in-service breakage.See Appendix X4 for guidelines for selecting testing combi-nations.3.2 Results obtained by use of this test method can be usedin three ways:3.2.1 As the basis for establishing impact test requirementsin product standards,3.2.2 To measure the effect of changes in materials orprocessing,and3.2.3 To measure the effect of the environment.4.Apparatus4.1 GeneralOne type of impact tester is illustrated in Fig.1.4.2 Tup:4.2.1 The tup nose shall be as shown in Fig.2.When usedwith the 0.50-in.(12.7-mm)radius nose,it is designated as TupA.When used with the 2.00-in.(51-mm)radius nose,it isdesignated as Tup B.When used with the 0.25-in.(6.3-mm)radius nose,it is designated as Tup C.NOTE1It is suggested that tups be made of scratch-resistant steel toreduce damage to the nose.Badly scarred noses may affect test results.4.2.2 The mass of the tup shall be 6,12,20,or 30 lb(2.7,5.4,9.1,or 13.6 kg).4.3 Drop Tube:4.3.1 The drop tube shall be of sufficient length(approxi-mately 12 ft(3.7 m)to provide for a fall of at least 10 ft(3.0m)and shall be mounted so that the lengthwise direction isvertical as measured with a plumb bob or a spirit level at least2 ft(610 mm)in length.4.3.2 Care must be taken to ensure that the tup falls freely;it must not“chatter”down the tube.NOTE2No material for the drop tube is specified.However,acolddrawn seamless steel tubing with an inside diameter of 2.563 6 0.003in.(65.10 6 0.08 mm),or acrylonitrile-butadiene-styrene(ABS)orpoly(vinyl chloride)(PVC)plastic pipe,212in.nominal pipe size,with astandard dimension ratio(SDR)of 21,have been found to be satisfactory.NOTE3Provided equivalent results are obtained,the tup may bedropped without a drop tube or guided by other means.The drop tube isused to reduce the hazard to operators and property that may occur whenthe tup rebounds.It also helps guide and center the tup so that it will bemore likely to strike the top of the test specimen.It may also be necessaryto provide a protective barrier around the specimen,particularly for largersizes of pipe and fittings,to protect the operator from flying broken pieces.NOTE4The tup may not fall freely if the clearance between the tup1This test method is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved Aug.1,2010.Published November 2010.Originallyapproved in 1965.Last previous edition approved in 2005 as D2444 99(2005).DOI:10.1520/D2444-99R10.2For 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 States1 and tube is too large or too small,or if it is restrained by a partial vacuumabove the tup,such as can be caused by the hold and release device.4.3.3 Means shall be provided(1)to hold the tup at steps of2 in.(50.8 mm)for a distance of 2 to 10 ft(610 mm to