1、Designation: F2262 09 An American National StandardStandard Specification forCrosslinked Polyethylene/Aluminum/CrosslinkedPolyethylene Tubing OD Controlled SDR91This standard is issued under the fixed designation F2262; the number immediately following the designation indicates the year oforiginal a
2、doption 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.1. Scope1.1 This specification covers establishes requirements forcoextruded cros
3、slinked polyethylene multi-layer pressure tub-ing with a continuously welded aluminum tube constructionbetween inner and outer layers of plastic. The inner and outercrosslinked polyethylene layers are bonded to the aluminum bya melt adhesive. The tubing is outside diameter controlled andmade in one
4、standard dimension ratio, SDR9 and is intended tobe used for hot and cold water conveyance in applications upto 180F (82.2C). Included in this specification is a system ofnomenclature for crosslinked polyethylene-aluminum-crosslinked polyethylene (PEX-AL-PEX) tubes, and the re-quirements and test me
5、thods for materials, dimensions ofcomponent layers and the finished tubing, layer adhesion test,weld strength, short-term burst pressure, long-term sustainedpressure and marking requirements. The tubing covered by thisspecification is intended for use in potable water distributionsystems for residen
6、tial and commercial applications, waterservice, hydronic radiant heating (HRH), radiant panel heating,baseboard, and snow melt systems.1.2 This specification covers only plastic-metal-plasticmulti-layer tubes incorporating a continuous welded aluminumtube. Tubing consisting of metallic layers not we
7、lded togetheris outside the scope of this specification.1.3 UnitsThe values stated in inch-pound units are to beregarded as standard. The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.4 Specifications for c
8、onnectors for use with pipe meetingthe requirements of this specification are given in Annex A1.1.5 The following precautionary caveat pertains only to thetest method portion, Section 9, of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated wit
9、h its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory require-ments prior to use.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology
10、Relating to PlasticsD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe, Tubing, and FittingsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2122 Test Method for Determining
11、 Dimensions of Ther-moplastic Pipe and FittingsD2765 Test Methods for Determination of Gel Content andSwell Ratio of Crosslinked Ethylene PlasticsD3350 Specification for Polyethylene Plastics Pipe and Fit-tings MaterialsF412 Terminology Relating to Plastic Piping Systems2.2 NSF International Standar
12、ds:NSF/ANSI 14 for Plastic Piping Components and RelatedMaterials3NSF/ANSI 61 for Drinking Water System Components-Health Effects32.3 Federal Standard:Fed. Std. No. 123 Marking for Shipments (Civil Agencies)42.4 Military Standard:MIL-STD-129 Marking for Shipment and Storage42.5 Uniform Classificatio
13、n and Committee Standard:Uniform Freight Classification51This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.11 onComposite.Current edition approved May 1, 2009. Published May 2009. Originallyapproved in 200
14、3. Last previous edition approved in 2005 as F2262 05. DOI:10.1520/F2262-09.2For 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 onth
15、e ASTM website.3Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140, http:/www.nsf.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.5Available from
16、the Uniform Classification Committee, Suite 1106, 222 SouthRiverside Plaza, Chicago, IL 60606.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized princ
17、iples on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.12.6 National Motor Freight Traffc Association Standard:National Motor Freig
18、ht Classification63. Terminology3.1 Definitions are in accordance with Terminology F412and abbreviations are in accordance with Terminology D1600,unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 tubing, PEX-AL-PEX , nmulti-layer tubing pro-duced by coextrusion or e
19、xtrusion of layers of polyethylene/aluminum/ polyethylene bonded together with a melt adhesiveand crosslinked by irradiation or chemical means in combina-tion with applied heat and moisture, or any combinationthereof.3.2.2 tubing hoop stress, n a value of hoop stress based onthe assumption of a homo
20、geneous wall cross-section.3.2.2.1 DiscussionThick walled plastic tubes producedfrom one material have hoop stresses that vary through the wallthickness, and are usually described by the Lame Theory. Themulti-layer nature of PEX-AL-PEX tubing, composed ofmaterials with very different Youngs Modulus
21、values, will, onpressurization, not have uniform stress distribution through thethickness of the wall of the tube. PEX-AL-PEX tubes have ahoop stress distribution that differs substantially from boththick and thin walled tubing cases.3.2.3 unaided eye, nobservable without visual enhance-ment beyond
22、correction for normal vision.4. Classification4.1 GeneralThis specification covers one type of PEX-AL-PEX tubing with outside diameters corresponding to theoutside diameter of the same nominal size as copper tubing(CTS).4.2 Tubing Outside DiameterThe PEX-AL-PEX tubesspecified in this standard are cl
23、assified by the outside diameterin one standard dimension ratio, SDR9.5. Materials5.1 GeneralPEX-AL-PEX tubing is comprised of onemetallic layer, two layers of polymeric adhesive and two-layersof crosslinked polyethylene. For tubing made to thisspecification, the constituent materials shall meet the
24、 respec-tive requirements of 5.2 5.5.5.2 AluminumThe aluminum shall have a minimum thick-ness as specified in Table 1. The material shall have a minimumelongation and tensile strength of 20 % and 13 000 psi (90MPa), respectively. The tests for these properties shall beconducted in accordance with AS
25、TM E8.5.3 Crosslinked Polyethylene:5.3.1 Polyethylene plastics used to make the PEX layers ofthe PEX-AL-PEX tubing shall be virgin resin having a mini-mum density of 0.941 g/cm3. The outer layer of polyethyleneshall be of color code B, C, or E in accordance withSpecification D3350. Color code B comp
26、ounds shall havesufficient ultraviolet (UV) stabilization to protect the tubingfrom deleterious effects due to outdoor exposure during storageand shipping. The inner layer of polyethylene shall be of colorcode A, B, or C.5.3.2 The polyethylene, in the final finished state in thetubing, shall be cros
27、slinked as defined in Terminology D883.The polyethylene layers may be crosslinked by peroxides, Azocompounds, or silane compounds in extrusion, or by electronbeam irradiation after extrusion, or by other means such thatthe tubing meets the performance requirements of Section 6.5.4 Melt AdhesiveThe m
28、aterial shall have a density cell of1, 2, or 3; a melt index cell of 1, 2, or 3; and a color code ofA or B, in accordance with Specification D3350.5.5 Rework MaterialThe use of reclaimed, recycled, orre-work plastics is not permitted.6. Requirements6.1 GeneralThe requirements and test methods in thi
29、sspecification cover PEX-AL-PEX tubing. Tests on the indi-vidual layers that comprise the final multi-layer tubing areoutside the scope of this specification. The raw materials used,however, shall conform to the requirements of Section 5.6.2 Dimensions and Tolerances:6.2.1 The dimensions of the tubi
30、ng and layers shall be inaccordance with Tables 1 and 2 when measured in accordancewith 9.1.6.2.1.1 Out-of-RoundnessMaximum out-of-roundness tol-erances apply only to measurements made on pipe prior tocoiling.6Available from National Motor Freight Traffic Association (NMFTA), 1001 N.Fairfax St., Ale
31、xandria, VA 22314, http:/www.nmfta.org.TABLE 1 Outside Diameters, Tolerances, and Aluminum Thickness for PEX-AL-PEXNominal TubingSize, in.Average OutsideDiameter, in. (mm)Tolerance on Avg,in. (mm)Maximum Out-of-Roundness,in. (mm)Aluminum Thickness Minimum,in. (mm)12 0.625 (15.88) 0.004 (0.10) 0.010
32、(0.25) 0.0095 (0.24 )34 0.875 (22.22) 0.004 (0.10) 0.010 (0.25) 0.0115 (0.29)1 1.125 (28.58) 0.005 (0.12) 0.010 (0.25) 0.0115 (0.29)TABLE 2 Wall Thickness for PEX-AL-PEXNominal TubingSize, in.Total Wall Thickness,min, in. (mm)Tolerance on Total Wall,in. (mm)Outer PEX Layer Thicknessmin, in. (mm)Inne
33、r PEX Layer Thicknessmin, in. (mm)12 0.070 (1.78) + 0.010 (0.25) 0.010 (0.25) 0.043 (1.09)34 0.097 (2.47) + 0.010 (0.25) 0.010 (0.25) 0.069 (1.75)1 0.125 (3.18) + 0.013 (0.33) 0.010 (0.25) 0.097 (2.46)F2262 0926.2.1.2 Pipe Wall ThicknessThe minimum wall thicknessat any point of measurement around th
34、e pipe circumferenceshall not be less than the value specified in Table 2.6.2.1.3 Outer and Inner PEX Layer ThicknessThe thick-ness of the PEX layers shall have a minimum value andtolerance as specified in Table 2, except for the polyethylenematerial overlaying the weld, which shall allow half themi
35、nimum specified in Table 2.6.3 AdhesionThere shall be no visible delamination orseparation of the PEX and aluminum layers, either on the boreside or the outside (see Fig. 1), when examined with theunaided eye in accordance with 9.2.6.4 Burst PressureTubing shall meet or exceed the mini-mum burst pre
36、ssure requirements shown in Table 3 when testedin accordance with 9.3.NOTE 1Burst pressure testing, is intended to be a test which can detectmechanical and material flaws from the construction of the tube. Mini-mum Burst pressure requirments are generally selected based upon themechanical strength p
37、roperties of the materials of construction at thespecific temperatures to be tested without regard to the ductile character-istics of the polymer.6.5 Sustained PressureTubing shall not fail, balloon,burst, or weep, as defined in Test Method D1598 when testedfor 1000 h at the temperature and pressure
38、 listed in Table 3when tested in accordance with 9.4.NOTE 2Sustained pressure testing, in thermoplastic pipe and tubingstandards relates generally to a short-term validation of the long-termhydrostatic properties that have been previously determined by a mini-mum of 10 000 h of hydrostatic testing.
39、Generally the sustained hydro-static pressure selected for the shorter term testing is based upon a lowerhoop stress selection than one which would otherwise be expected togenerate a rupture failure.6.6 Gel ContentThe inner and outer layers of crosslinkedpolyethylene, when tested in accordance with
40、9.5, shall bewithin the range from 65 to 89 % inclusive. Depending on theprocess used, the following minimum percentage crosslinkingvalues shall be achieved: 70 % by peroxides, 65 % by Azocompounds, 65 % by electron beam, or 65 % by silane com-pounds.6.7 Apparent Ring Tensile StrengthThe pipe rings,
41、 whentested in accordance with 9.6, shall meet the minimum strengthspecifications defined in Table 4.7. Workmanship, Finish, and Appearance7.1 The tubing shall be free of visible cracks, blisters, holes,foreign inclusions and other known injurious defects. The(a) Good pipe showing no delamination.(b
42、) Delamination between the inner layer and the aluminum.(c) Delamination between the outer layer and the aluminum.FIG. 1 Detection of DelaminationF2262 093tubing shall be as uniform as practical in color, opacity, densityand other physical properties.8. Sampling and Conditioning8.1 SamplingCollect a
43、 sample of the PEX-AL-PEX tub-ing sufficient to determine conformance with this specification.8.2 Conditioning:8.2.1 For referee purposes, condition the specimens at 73.46 3.6F (23 6 2C) and 50 6 5 % relative humidity for notless than 40 h prior to testing in accordance with Procedure Aof Practice D
44、618, for those tests where conditioning is re-quired. In cases of disagreement, the tolerances shall be 61.8F (6 1C) and 6 2 % relative humidity.8.2.2 For routine quality control testing, condition the speci-mens at the temperature and humidity of the manufacturerstesting facility for not less than1
45、horuntil the specimens areat the room temperature.8.3 Test Conditions:8.3.1 For referee purposes, conduct the tests in the standardlaboratory atmosphere of 73.4 6 3.6F (23 6 2C) and 50 65 % relative humidity, unless otherwise specified. In cases ofdisagreement, the tolerances shall be 6 1.8F (6 1C)
46、and 62 % relative humidity.8.3.2 For routine control testing, conduct tests at the roomtemperature and humidity of the manufacturers testing area.9. Test Methods9.1 Dimensions:9.1.1 Any length of tubing selected at random is suitable todetermine dimensions.9.1.2 Outside DiameterMeasure the outside d
47、iameter oftubing in accordance with Test Method D2122.9.1.3 Total Wall ThicknessMake measurements of thetotal wall thickness in accordance with Test Method D2122.Measure the total wall thickness at each end of the sample tothe nearest 0.001 in (0.02 mm).9.1.4 Inner and Outer Crosslinked Polyethylene
48、 LayerThickness:9.1.4.1 Sample PreparationCut the tubing with a suitablesharp cutter ensuring that the tubing at the point of the cut andafter cutting is no more than 10 % out-of-round.9.1.4.2 Thickness DeterminationUsing a visual magnify-ing instrument with sufficient magnification to render a mea-
49、suring resolution of 0.001 in. (0.02 mm) with a graduatedreticle, measure the thickness of both inner and outer layers atsix equally spaced points around the circumference.9.2 Adhesion Examination:9.2.1 Cutting the SpiralMount a Stanley 1991 or similarlysharp but rigid, razor-like blade within a protective housing andangle to cut a 45 6 5 spiral in a pipe sample (see Fig. 2).Choose a PEX-AL-PEX tubing sample at random and insertinto the housing and rotate to form the spiral cut. The cut goesthrough the complete wall on one si
