1、Designation: F 913 02e1An American National StandardStandard Specification forThermoplastic Elastomeric Seals (Gaskets) for JoiningPlastic Pipe1This standard is issued under the fixed designation F 913; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e case of revision, 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.e1NOTESection 8.7 and Table 1 were editorially revised in September 2006.1. Scope1.1 This specifi
3、cation covers thermoplastic elastomericseals (gaskets) used to seal the joints of plastic pipe and fittingsused for gravity and low-pressure applications.2This specifi-cation refers to push-on joints that require no internal orexternal pressure to effect the initial seal.1.2 Requirements are given f
4、or thermoplastic elastomers.1.3 The values in SI units are to be regarded as standard.The values given in parentheses are mathimatical conversionsto inch-pound units which are provided for information onlyand are not considered the standard.1.4 The following precautionary caveat pertains only to the
5、test 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 and healthpractices and determine the applicability of reg
6、ulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:3D 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 471 Test Method for Rubber PropertyEffect of LiquidsD 573 Test Method for RubberDeterioration in an AirOvenD 1149 Test Method for Rubber Deterio
7、rationSurfaceOzone Cracking in a ChamberD 1414 Test Methods for Rubber O-RingsD 1566 Terminology Relating to RubberD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 2240 Test Method for Rubber PropertyDurometerHardnessD 6147 Test Method for Vulcanized Rubber and Thermo-plastic ElastomerD
8、etermination of Force Decay (StressRelaxation) in CompressionF 412 Terminology Relating to Plastic Piping SystemsF118 Definitions of Terms Relating to Gaskets3. Terminology3.1 Definitionsare in accordance with Terminology F 412,and abbreviations are in accordance with Terminology D 1600,unless other
9、wise specified.3.2 Terms relating to rubber or elastomer shall be as definedin Terminology D 1566 and Definitions F118.3.3 Definitions of Terms Specific to This Standard:3.3.1 gravity and low pressure applications, npressurebelow 150 kPa (21 psi) or (50-ft) head of water.4. Materials and Manufacture
10、4.1 The gasket shall be fabricated from a high-grade ther-moplastic elastomer meeting the requirements in Table 1.4.2 The gasket shall meet the force decay (stress relaxation)requirements of 5.1.3.4.3 The thermoplastic elastomer used must be noncrazing topipe. The gasket shall not cause craze marks,
11、 pits, or blisters incontact with the plastic pipe. Staining of the plastic pipe in the1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.20 on Joining.Current edition approved Sept. 10, 2002. Published Oc
12、tober 2002. Originallypublished as F 913 86. Last previous edition F 913 01.2Supporting data are available at ASTM Headquarters. Request RR:F17-1035.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStanda
13、rds volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.area of gasket contact is acceptable. Test in accordance with8.8 to qualify thermoplastic elastom
14、ers for pipe made from theplastic polymer in question.4.4 Where the particular joint design utilizing a TPELgasket dictates the use of lubricant to facilitate assembly, thelubricant shall be of such composition that will in no waydamage the gasket or pipe due to prolonged exposure and shallnot adver
15、sely affect the sealing capability of the gasket.NOTE 1By agreement between the purchaser and the manufacturer,chemical analysis may be required and limits established for elements orcompounds not specified.5. Physical Requirements Physical Requirements5.1 The sealing portion of the gasket shall com
16、ply with thephysical requirements listed in Table 1 when tested in accor-dance with the methods in Section 8.NOTE 2Some gasket incorporated a high durometer elastomeric ornonelastomeric, that is, metal or plastic material, as a reinforcement orretaining feature, or both. These materials do not alter
17、 the physicalproperties of the sealing portion of the gasket and should not be tested assuch, or expected to meet the material requirements listed in Table 1.NOTE 3The materials used for retaining or reinforcement, or both,should not encroach upon the sealing surfaces of the gasket, and havephysical
18、 properties which are adequate for the anticipated usage of thegasket.5.1.1 HardnessA variation of 6 5 points of Type Adurometer from the manufacturers specified hardness shall beallowed when tested in accordance with 8.3.5.1.2 Elongation for the harder portion of multi-durometergaskets shall not be
19、 less than 100 %. The elongation for thesofter portion of the gasket shall meet the requirements ofTable 1.5.1.3 Force Decay (Stress Relaxation)Using the proce-dure in D 6147, the remaining stress shall be a minimum of40 % of the initial stress. Testing shall be done at 70 6 2C(158 6 4F) for a minim
20、um of 168 h. (Method B)6. Dimensions, Mass, and Permissible Variations6.1 When in its final assembled position, the gasket shall notbe stretched more than 30 % of its original circumference.NOTE 4Excessive stretch may have deleterious effect on TPELgaskets. The minimum stretch compatible with the pr
21、oper performance ofthe gasket should be used at all times.6.2 The gaskets shall conform to the dimensions specifiedby the manufacturer of the pipe or fittings with which thegaskets are to be used, with a tolerance of 6 3 % on allcross-sectional dimensions, and 6 1 % on all diametricaldimensions unle
22、ss otherwise agreed upon by the pipe or fittingmanufacturer and the purchaser.6.3 For molded gaskets or gasket material, the permissibleflash shall be a maximum of + 0.80mm (0.032 in.). Maximummold mismatch shall not exceed 0.25 mm (0.010 in).7. Workmanship, Finish, and Appearance7.1 All gaskets sha
23、ll be extruded or molded in such amanner that any cross section will be dense, homogeneous, andfree of porosity, blisters, pitting, or other imperfections.7.2 Where a splice is used in the manufacture of the gasket,the strength shall be such that the gasket shall withstand 100 %elongation over the p
24、art of the gasket that includes the splicewith no visible separation of the splice. (While in a stretchedposition the gasket shall be rotated in the spliced area aminimum of 180 in each direction in order to inspect forseparation. In addition, any portion of the splice shall becapable of passing a b
25、end test without visible separation.) Thebend test for circular gaskets is defined as wrapping the portionof the unstretched gasket containing the splice a minimum of180 and a maximum of 270 around a rod of a diameter equalto the cross-section diameter of the gasket.8. Test Methods8.1 Perform labora
26、tory tests to determine the physical prop-erties of the gaskets to be furnished under this specification on:(1) the finished product as supplied, (2) test specimens takenfrom the finished product, or (3) from specimens of fabricationof the same elastomeric compound, and in accordance with theappropr
27、iate ASTM standard.8.2 Tensile Strength and ElongationDetermine tensilestrength and elongation in accordance with Test MethodsD 412 or Test Methods D 1414 for O-rings.TABLE 1 Physical Property Requirements for Seals Made from Thermoplastic Elastomers (TPEL)Properties Condition TestMethodMinimum Requ
28、irementsTensile strength unaged D 412A2 MPa (300 psi) minimumafter oven aging for 96 h at70Cmaximum change of 15%Elongation unaged D 412A350 % minimumafter oven aging for 96 h at70Cmaximum change of 20 %Hardness unaged D 2240A40 durometer A minimumafter oven aging for 96 h at70Cmaximum change of 8 u
29、nitsLow temperature hardness type A or D durometer10CD 2240Amaximum increase of 15 unitsOzone resistance 70 h at 50 pphmozone at40C at 20 %extensionD 1149 No cracksWater immersion after 48 h at 70C D 471A5 % maximum change in volumeForce Decay after 168 h at 70C D 6147 40 % minimum remainingAFor O-r
30、ings refer to Test Method D 1414.Editorially revised in September 2006.F91302e128.3 HardnessDetermine the durometer, Type A, in accor-dance with Test Method D 2240 or Test Methods D 1414 forO-rings. Readings shall be taken after a 5-s delay.8.4 Low-Temperature HardnessMeasure the durometer,Type A, i
31、n accordance with Test Method D 2240 or TestMethods D 1414 for O-rings after conditioning for 22 h at 106 2C (+14 6 4F) to determine the change in hardness.Readings shall be taken after a 5-s delay.8.5 Accelerated AgingConditioning of samples for thedetermination of accelerated aging shall be in acc
32、ordance withTest Method D 573.8.5.1 Age physical test specimens for 96 h at 70 6 2C (1586 4F).8.6 Water ImmersionDetermine the change in volume inaccordance with Test Method D 471 or Test Methods D 1414for O-rings.8.6.1 The temperature shall be 70 6 2C (158 6 4F), andthe immersion period shall be 48
33、 h.8.6.2 Immediately after removal from the water, blot thespecimens, weigh, and calculate the volume increase in accor-dance with Test Method D 471.8.7 Ozone ResistanceDetermine the gaskets resistance toozone in accordance with Test Method D 1149.8.7.1 Conduct test for 70 h in 50 pphm concentration
34、 at 406 2C (104 6 4F) with specimens stressed to 20 % extension.8.8 Determine elastomer compound effect on pipe (4.3)bythe following procedure:8.8.1 The fixture for the test shall provide for direct contactbetween the plastic and the TPE gasket specimens and shallallow for 25 % compression of the ru
35、bber gasket.8.8.2 Age the specimens under load with compression of theTPE at 25 % for 96 h at 70 6 2C (158 6 4F).8.8.3 Let the specimens cool in the fixture for 24 h at 21 to25C (70 to 77F).8.8.4 Upon release, inspect the plastic bearing plate surfacethat has been in contact with the elastomeric com
36、pound forcracks, craze marks, pits, or blister (4.3).8.9 Force Decay (Stress Relaxation)Determine force de-cay in accordance with Test Method D 6147.8.9.1 Conduct test for 168 h at 70C with specimensstressed to 25 % compression.9. Inspection9.1 Inspection of the material shall be agreed upon between
37、the purchaser and the supplier as part of the purchase contract.10. Rejection and Rehearing10.1 Material that fails to conform to the requirements ofthis specification shall be rejected. Rejection shall be reportedto the producer or supplier promptly and in writing. In case ofdissatisfaction with th
38、e results of the test, the producer orsupplier may make claim for a rehearing.10.2 The TPEL gaskets shall be subject to rejection when-ever they show surface checking, weathering, or other deterio-ration prior to installation.11. Certification11.1 When specified in the purchase order or contract, th
39、epurchaser shall be furnished certification that samples repre-senting each lot have been either tested or inspected as directedin this specification and the requirements have been met. Whenspecified in the purchase order or contract, a report of the testresults shall be furnished.12. Marking12.1 Th
40、e markings shall include the gasket manufacturersname or symbol, gasket size, and manufacturers code.13. Storage13.1 The TPEL gaskets should be stored in a cool, clean,shaded place.14. Keywords14.1 elastomeric; joining; piping; seals; thermoplasticASTM International takes no position respecting the
41、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 rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is
42、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 revision of this standard or for additional standardsand should be addressed to ASTM International Head
43、quarters. 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 you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This sta
44、ndard 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 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).F91302e13
