1、Designation: F913 02 (Reapproved 2014) An American National StandardStandard Specification forThermoplastic Elastomeric Seals (Gaskets) for JoiningPlastic Pipe1This standard is issued under the fixed designation F913; the number immediately following the designation indicates the year of originalado
2、ption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers thermoplastic elastomericseals (gaskets) used to
3、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 for thermoplastic elastomers.1.3 The values stated in inch-pound
4、 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.1.4 The following precautionary caveat pertains only to thetest methods portion, Section 8, of this specification: Thiss
5、tandard 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. Referenced Documents2.1
6、ASTM Standards:3D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD1149 Test Methods for Rubber DeteriorationCracking inan Ozone Controlled EnvironmentD1414 Test Metho
7、ds for Rubber O-RingsD1566 Terminology Relating to RubberD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2240 Test Method for Rubber PropertyDurometer Hard-nessD6147 Test Method for Vulcanized Rubber and Thermoplas-tic ElastomerDetermination of Force Decay (StressRelaxation) in Compress
8、ionF412 Terminology Relating to Plastic Piping SystemsF118 Definitions of Terms Relating to Gaskets3. Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Terminology F412,and abbreviations are in accordance with Terminology D1600,unless otherwise specified.3.1.2 Terms relating to rub
9、ber or elastomer shall be asdefined in Terminology D1566 and Definitions F118.3.2 Definitions of Terms Specific to This Standard:3.2.1 gravity and low pressure applications, npressurebelow 150 kPa (21 psi) or (50-ft) head of water.4. Materials and Manufacture4.1 The gasket shall be fabricated from a
10、 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, pits, or blisters incontact with the pla
11、stic pipe. Staining of the plastic pipe in thearea of gasket contact is acceptable. Test in accordance with8.8 to qualify thermoplastic elastomers for pipe made from theplastic polymer in question.4.4 Where the particular joint design utilizing a TPELgasket dictates the use of lubricant to facilitat
12、e assembly, thelubricant shall be of such composition that will in no waydamage the gasket or pipe due to prolonged exposure and shallnot adversely affect the sealing capability of the gasket.NOTE 1By agreement between the purchaser and the manufacturer,chemical analysis may be required and limits e
13、stablished for elements orcompounds not specified.1This 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 April 1, 2014. Published May 2014. Originallypublished as approve
14、d in 1986. Last previous edition approved in 2008 asF913 02(2008). DOI: 10.1520/F0913-02R14.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F17-1035.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
15、 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 States15. Physical Requirements5.
16、1 The sealing portion of the gasket shall comply 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 f
17、eature, or both. These materials do not alter 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 sea
18、ling surfaces of the gasket, and havephysical 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 p
19、ortion of multi-durometergaskets shall not be 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 D6147, the remaining stress shall be a minimum of40 % of the initial stress. Testing sh
20、all be done at 70 6 2C(158 6 4F) for a minimum 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
21、. The minimum stretch compatible with the proper 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,
22、 and 6 1 % on all diametricaldimensions unless 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. Workmanshi
23、p, Finish, and Appearance7.1 All gaskets shall 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 gaske
24、t shall withstand 100 %elongation over the part 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
25、of the splice shall becapable of passing a bend 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
26、the gasket.8. Test Methods8.1 Perform laboratory 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
27、 compound, and in accordance with theappropriate ASTM standard.8.2 Tensile Strength and ElongationDetermine tensilestrength and elongation in accordance with Test Methods D412or Test Methods D1414 for O-rings.8.3 HardnessDetermine the durometer, Type A, in accor-dance with Test Method D2240 or Test
28、Methods D1414 forO-rings. Readings shall be taken after a 5-s delay.8.4 Low-Temperature HardnessMeasure the durometer,Type A, in accordance with Test Method D2240 or TestMethods D1414 for O-rings after conditioning for 22 h at 106 2C (+14 6 4F) to determine the change in hardness.Readings shall be t
29、aken after a 5-s delay.8.5 Accelerated AgingConditioning of samples for thedetermination of accelerated aging shall be in accordance withTest Method D573.TABLE 1 Physical Property Requirements for Seals Made from Thermoplastic Elastomers (TPEL)Properties Condition Test Method Minimum RequirementsTen
30、sile strength unaged D412A2 MPa (300 psi) minimumafter oven aging for 96 h at70Cmaximum change of 15%Elongation unaged D412A350 % minimumafter oven aging for 96 h at70Cmaximum change of 20 %Hardness unaged D2240A40 durometer A minimumafter oven aging for 96 h at70Cmaximum change of 8 unitsLow temper
31、ature hardness type A or D durometer10CD2240Amaximum increase of 15 unitsOzone resistance 70 h at 50 pphm ozone at40C at 20 %extensionD1149 No cracksWater immersion after 48 h at 70C D471A5 % maximum change in volumeForce Decay after 168 h at 70C D6147 40 % minimum remainingAFor O-rings refer to Tes
32、t Method D1414F913 02 (2014)28.5.1 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 D471 or Test Methods D1414 forO-rings.8.6.1 The temperature shall be 70 6 2C (158 6 4F), andthe immersion period shall be 48 h.
33、8.6.2 Immediately after removal from the water, blot thespecimens, weigh, and calculate the volume increase in accor-dance with Test Method D471.8.7 Ozone ResistanceDetermine the gaskets resistance toozone in accordance with Test Method D1149.8.7.1 Conduct test for 70 h in 50 pphm concentration at 4
34、06 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 rubber
35、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 compound
36、 forcracks, craze marks, pits, or blister (4.3).8.9 Force Decay (Stress Relaxation)Determine force de-cay in accordance with Test Method D6147.8.9.1 Conduct test for 168 h at 70C with specimensstressed to 25 % compression.9. Inspection9.1 Inspection of the material shall be agreed upon betweenthe pu
37、rchaser 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 the resu
38、lts 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, thepurch
39、aser 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 The mark
40、ings 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 validi
41、ty 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 subjec
42、t 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 Headquarte
43、rs. 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 standard
44、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F913 02 (2014)3
