1、Designation: D 6070 02An American National StandardStandard Test Methods forPhysical Properties of Smooth-Wall, Coilable, Polyethylene(PE) Conduit (Duct) for Preassembled Wire and Cable1This standard is issued under the fixed designation D 6070; the number immediately following the designation indic
2、ates 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover procedures for de
3、terminingthe environmental performance properties of smooth-wall,coilable, medium-density and high-density polyethylene(MDPE and HDPE) conduit (duct) for preassembled wire andcable.1.2 Whenever two sets of values are presented, in differentunits, the values in the first set are the standrd, while th
4、ose inparentheses are for information only.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 regulato
5、ry limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 2444 Test Method for Determination of the ImpactResistance of Thermoplastic Pipe and Fittings by Means ofa Tup (Falling Weight)23. Significance and Use3.1 Environmental performance test values for smooth-wall,coilable, medium de
6、nsity and high density polyethylene(MDPE and HDPE) conduit (duct) for preassembled wire andcable may provide data for research and development, engi-neering design, quality control, and acceptance or rejectionunder specifications.4. Procedure4.1 Performance TestsRemove electrical wire or cables,or b
7、oth, from the duct before performing the following tests.4.2 Compression and RecoveryFlatten three specimens ofduct 6 in. (150 mm) long, that have been conditioned at 23 62C (73 6 4F) and 50 6 5 % relative humidity for not lessthan 48 h, between parallel plates at a rate of 0.5 in./min (13mm/min) in
8、 a suitable press until the distance between theparallel plates has been decreased by 50 % of the originalinside diameter of the duct. Be sure the specimens, the testapparatus, and the surrounding air are in thermal equilibriumwith one another at a temperature of 23 6 2C during the test.The minimum
9、force required to compress the specimens to the50 % deflection is shown in Table 1. Within 10 min afterremoval of the force, the specimens shall recover as specifiedin the individual product specification.4.3 Impact Test:4.3.1 Room-Temperature TestCut ten 6-in. (150-mm)specimens, from finished lengt
10、hs of each size of coilable PEduct to be tested. The surfaces shall not have cracks, tears, orother imperfections. The specimens, the test apparatus, and thesurrounding air are to be in thermal equilibrium with oneanother at a temperature of 23 6 2C (73 6 4F) during thetest. Use the test apparatus a
11、nd method described in 4.3.3.4.3.2 Low-Temperature TestCut ten 6-in. (150-mm) speci-mens, from finished lengths of each size of coilable PE duct tobe tested. The surfaces shall not have cracks, tears, or otherimperfections. Condition the specimens at a temperature of20 6 2C (4 6 4F) for 5 h. Conditi
12、on the test apparatus ata temperate of 23 6 2C (73 6 4F). The test apparatus andmethod are described in 4.3.3. Remove the samples from thecold chamber and complete the impact test within 30 s.4.3.3 Test Method Test each specimen separately while itis resting on a solid, flat steel plate that has a n
13、ominal thicknessof at least 0.5 in. (12.5 mm) and that is firmly anchored with itsupper surface horizontal. It is recommended that a protectivecage surround the plates and specimens to prevent injury frompieces of broken duct in the event that the duct shatters. Allowa 20-lb (9-kg) Type B tup as des
14、cribed in Test Method D 2444to fall freely through a vertical guide from the heights indicatedin Table 2. Allow the face of the tup to strike the center of thespecimen once (provide for preventing the tup from striking the1These test methods are under the jurisdiction of ASTM Committee F17 onPlastic
15、 Piping Systems and are the direct responsibility of Subcommittee F17.40 onTest Methods.Current edition approved Sept. 10, 2002. Published October 2002. Originallypublished as D 6070-96. Last previous edition D 6070-98.2Annual Book of ASTM Standards, Vol 08.04.1Copyright ASTM International, 100 Barr
16、 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.specimen more than once).Acrack or tear longer than 0.031 in.(0.8 mm) is considered a failure.5. Precision and Bias5.1 PrecisionThese test methods have been in use formany years, but no statements of precision have been made
17、 andno activity is planned to develop such a statement.5.2 BiasA statement of bias is not possible due to a lackof a standard reference material.6. Keywords6.1 compression and recovery; conduit; duct; high-densitypolyethylene; impact test; medium-density polyethyleneASTM International takes no posit
18、ion 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 rights, and the riskof infringement of such rights, are entirely their own responsibilit
19、y.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 revision of this standard or for additional standardsand should be addressed to ASTM
20、 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 you shouldmake your views known to the ASTM Committee on Standards, at the address s
21、hown 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 be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-8
22、32-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Minimum Load for Compression and Recovery TestNominal Inside Diameter,in. (mm)Type II Medium Density Type III High Densitylb/ft kN/m lb/ft kN/m12 (12.7) 250 3.6 300 4.434 (19.3) 250 3.6 300 4.41 (25.4) 275
23、4.0 350 5.1114 (31.8) 300 4.4 375 5.5112 (38.1) 375 5.5 475 6.92 (50.8) 500 7.3 600 8.8212 (63.5) 700 10.2 700 10.23 (76.2) 700 10.2 700 10.2TABLE 2 Height for Dropping TupNominal Inside Diameter,in. (mm)Type II Medium Density Type III High Densityft m ft m12 (12.7) 4 1.2 2.5 0.834 (19.3) 4 1.2 4 1.21 (25.4) 5 1.5 5 1.5114 (31.8) 6 1.8 6 1.8112 (38.1) 7.5 2.3 7.5 2.32 (50.8) 9.5 2.9 9.5 2.9212 (63.5) 10.5 3.2 10.5 3.23 (76.2) 11 3.4 11 3.4D 6070 022
