1、Designation: D3350 12Standard Specification forPolyethylene Plastics Pipe and Fittings Materials1This standard is issued under the fixed designation D3350; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers the identification of polyeth-ylene plastic pipe and fittings materials in accordance with acell classific
3、ation system. It is not the function of this specifi-cation to provide specific engineering data for design purposes,to specify manufacturing tolerances, or to determine suitabilityfor use for a specific application.1.2 Polyethylene plastic materials, being thermoplastic, arereprocessable and recycl
4、able (Note 2). This specification al-lows for the use of those polyethylene materials, provided thatall specific requirements of this specification are met.NOTE 1The notes in this specification are for information only andshall not be considered part of this specification.NOTE 2See Guide D5033 for i
5、nformation and definitions related torecycled plastics.1.3 The values stated in SI units are to be regarded asstandard.1.4 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-pri
6、ate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 3There is no known ISO equivalent to this standard.1.5 For information regarding molding and extrusion mate-rials see Specification D4976. For information regarding wireand cable materials se
7、e Specification D1248.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD746 Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD790 Test Methods for Flexural Properties of Unreinfo
8、rcedand Reinforced Plastics and Electrical Insulating MaterialsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1238 Test Method for Melt Flow Rates of Thermoplasticsby Extrusion PlastometerD1248 Specification for
9、 Polyethylene Plastics ExtrusionMaterials for Wire and CableD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD1603 Test Method for Carbon Black Content in OlefinPlasticsD1693 Test Method for Environmental Stress-Cracking ofEthylene PlasticsD1898 Practice for Sampling of Pla
10、stics3D2837 Test Method for Obtaining Hydrostatic Design Basisfor Thermoplastic Pipe Materials or Pressure Design Basisfor Thermoplastic Pipe ProductsD2839 Practice for Use of a Melt Index Strand for Deter-mining Density of PolyethyleneD3892 Practice for Packaging/Packing of PlasticsD4218 Test Metho
11、d for Determination of Carbon BlackContent in Polyethylene Compounds By the Muffle-Furnace TechniqueD4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens, Plaques, or SheetsD4883 Test Method for Density of Polyethylene by theUltrasound TechniqueD4976 Specification for Pol
12、yethylene Plastics Molding andExtrusion MaterialsD5033 Guide for Development of ASTM Standards Relat-ing to Recycling and Use of Recycled Plastics3F1473 Test Method for Notch Tensile Test to Measure theResistance to Slow Crack Growth of Polyethylene Pipesand Resins2.2 ISO Standard:ISO 12162 Thermopl
13、astic Materials for Pipes and Fittingsfor Pressure ApplicationsClassification and1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved April 1, 2012. Published May 2012
14、. Originallyapproved in 1974. Last previous edition approved in 2010 as D3350 - 10A. DOI:10.1520/D3350-12.2For 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 standa
15、rds Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428
16、-2959, United States.DesignationOverall Service (Design) Coefficient3. Terminology3.1 DefinitionsTerms as described in Terminology D883shall apply in this specification.3.1.1 polyethylene plasticsas defined by this specification,plastics or resins prepared by the polymerization of no less than85 % e
17、thylene and no less than 95 % of total olefins withadditional compounding ingredients.3.2 Definitions of Terms Specific to This Standard:3.2.1 materialspolyethylene (PE) resins with the addedcompounding ingredients.3.2.2 PE compoundshas the same meaning as PE plasticsmaterials, compounds, and plasti
18、cs.3.3 Historical usage and user group conventions have re-sulted in inconsistent terminology used to categorize anddescribe polyethylene resins and compounds. The followingterminology is in use in ASTM specifications pertaining topolyethylene:3.3.1 Specification D1248:3.3.1.1 Type (0, I, II, III, I
19、V) = density ranges (same,respectively, as Class in Specification D4976).3.3.1.2 Class (A, B, C, D) = composition and use.3.3.1.3 Category (1, 2, 3, 4, 5) = melt index ranges (same asGrade in Specification D4976).3.3.1.4 Grade (E, J, D, or W followed by one or two digits)= specific requirements from
20、 tables.3.3.2 Specification D3350:3.3.2.1 Type (I, II, III) = density ranges (same as Types I, II,and III in Specification D1248 and Classes 1, 2, and 3 inSpecification D4976).3.3.2.2 Class = a line callout system consisting of “PE”followed by six cell numbers from Table 1 plus a letter (A, B,C, D,
21、E) denoting color and UV stabilizer.3.3.2.3 Grade = simplified line callout system using “PE”followed by density and slow crack growth cell numbers fromTable 1.3.3.3 Specification D4976:3.3.3.1 Group (1, 2) = branched or linear polyethylene.3.3.3.2 Class (0, 1, 2, 3, 4) = density ranges (same,respec
22、tively, as Type in Specification D1248).3.3.3.3 Grade (1, 2, 3, 4, 5) = melt index ranges (same asCategory in Specification D1248).4. Classification4.1 Polyethylene plastic pipe and fittings compounds areclassified in accordance with density, melt index, flexuralmodulus, tensile strength at yield, s
23、low crack growth resis-tance, and hydrostatic strength classification in Table 1.NOTE 4It has been a long-standing practice to use the following termsin describing polyethylene plastics:Type I (0.910 to 0.925) = Low DensityType II (0.926 to 0.940) = Medium DensityType III (0.941 to 0.965) = High Den
24、sityNOTE 5The manner in which materials are identified in the cellclassification is illustrated for Class PE233424B as follows (refer also toTable 1 and 6.2):Class233424BDensity (0.9260.940 g/cm3)Melt Index (0.925-0.9400.940-0.9470.947-0.9550.955 . . . SpecifyValue2. Melt index D1238 Unspecified 1.0
25、 1.0 to0.41103(160 000)SpecifyValue4. Tensile strengthat yield, MPa (psi)D638 Unspecified 28(4000)SpecifyValue5. Slow CrackGrowth ResistanceI. ESCR D1693 Unspecifieda. Test condition(100% Igepal.)DA B C C . . . . . . . . . SpecifyValueb. Test duration, h 48 24 192 600c. Failure, max, % Unspecified 5
26、0 50 20 20II. PENT (hours) F1473Molded plaque,80C, 2.4 MPaUnspecified . . . . . . . . . 10 30 100 500 SpecifyValueNotch depth,F1473, Table 1Unspecified6. Hydrostatic StrengthClassificationI. Hydrostatic designbasis, MPa (psi), (23C)D2837 NPRE5.52(800)6.89(1000)8.62(1250)11.03(1600). .II. Minimum req
27、uiredstrength, MPa (psi), (20C)ISO 12162 . . . . . 8(1160)10(1450)ACompliance with physical properties in accordance with Section 8 is required including requirements for cell classification, color, and ultraviolet (UV) stabilizer, thermalstability, brittleness temperature, density, tensile strength
28、 at yield, and elongation at break.BRefer to 10.1.4.1.CRefer to 10.1.4.2.DThere are environmental concerns regarding the disposal of Nonylphenoxy poly(ethyleneoxy) ethanol (CAS 68412-54-4) for example, Igepal CO-630. Users areadvised to consult their supplier or local environmental office and follow
29、 the guidelines provided for the proper disposal of this chemical.ENPR = Not Pressure Rated.D3350 123within 63.45 MPa (6500 psi) of the nominal value, it shall beconsidered as conforming to the nominal value and to allclassifications based on the nominal value.6.7 Elongation at BreakAs tested in acc
30、ordance with10.1.6, all pressure rated materials shall have a minimumextension at break of 400 %.7. Sampling7.1 A batch or lot shall be considered as a unit of manufac-ture and shall consist of one production run or as a blend of twoor more production runs of material.7.2 Unless otherwise agreed upo
31、n between the manufacturerand the purchaser, the material shall be sampled in accordancewith the procedure described in Sections 9 through 12 ofPractice D1898. Adequate statistical sampling prior to packag-ing shall be considered an acceptable alternative.NOTE 8A sample taken from finished product m
32、ay not necessarilyrepresent the original batch or lot.8. Number of Tests8.1 The requirements identified by the material designationand otherwise specified in the purchase order shall be verifiedby tests made in accordance with 11.1. For routine inspection,only those tests necessary to identify the m
33、aterial to thesatisfaction of the purchaser shall be required. One sampleshall be sufficient for testing each batch or lot provided that theaverage values for all of the tests made on that batch or lotcomply with the specified requirements.9. Specimen Preparation9.1 Unless otherwise specified in Sec
34、tion 10, the test speci-mens shall be molded in accordance with Procedure C ofAnnex A1 of Practice D4703.9.2 When pipe or fitting test specimens are required, theyshall be extruded or molded in accordance with the specifica-tions of the material manufacturer.10. Test Methods10.1 The properties enume
35、rated in this specification shall bedetermined in accordance with the following test methods:10.1.1 ConditioningUnless otherwise specified in the testmethods or in this specification, for those tests where condi-tioning is required, condition the molded test specimens inaccordance with Procedure A o
36、f Practice D618.10.1.2 Test ConditionsUnless otherwise specified in thetest methods or in this specification, conduct tests at thestandard laboratory temperature of 23 6 2C (73.4 6 3.6F).10.1.3 DensityTest Method D1505 or alternative methodsreferenced in 2.1 (see D792, D2839, and D4883) providingequ
37、ivalent accuracy. Make duplicate determinations using twoseparate portions of the same molding or from two moldings.FIG. 1 Mounting Film Specimen in CupD3350 124The molded specimen thickness portions shall be 1.9 6 0.2mm (0.075 6 0.008 in.). Calculate the average value.10.1.4 Melt IndexTest Method D
38、1238, using Condition190/2.16. Make duplicate determinations on the material in theform of powder, granules, or pellets, and calculate the average;no conditioning is required.10.1.4.1 For materials having a melt index less than 0.15(Cell 4), the manufacturer shall report a flow rate not greaterthan
39、20 g/10 min and not less than 4.0 g/10 min when tested inaccordance with Test Method D1238, Condition 190/21.6.10.1.4.2 Classify materials having a melt index less than0.15 (Cell 4) as Cell 5 only if they have a flow rate not greaterthan 4.0 g/10 min when tested in accordance with Test MethodD1238,
40、Condition 190/21.6.NOTE 9For materials having a melt index less than 0.40 to 0.15 g/10min (Cell 3), the manufacturer may report a flow rate value when testedin accordance with Test Method D1238, Condition 190/21.6.NOTE 10Flow rate is the general term used for all results obtainedwith Test Method D12
41、38. Although the flow rate of polyethylene plasticsmay be measured under any of the conditions listed for it under 7.2 of TestMethod D1238, only measurements made at Condition 190/2.16 may beidentified as “Melt Index.”10.1.5 Flexural ModulusTest Methods D790, usingMethod 1, Procedure B, and a 50-mm
42、(2-in.) test span.Test fivespecimens, each 3.2 by 12.7 mm (18 by12 in.) flatwise at acrosshead speed of 12.7 mm/min (0.5 in./min) and the averagevalue of the secant modulus calculated at 2 % strain in theouter fibers.10.1.5.1 The deflection of the test specimen correspondingto 2 % strain (0.02 mm/mm
43、 or in./in.) is calculated as follows:D5rL2/6dwhere:D = deflection of the center of the beam test specimen at2 % strain, in.,r = strain in the outer fibers = 0.02 mm/mm (0.02 in./in.),L = test span = 50 mm (2 in.), andd = specimen depth = 3.2 mm (18 in.).10.1.5.2 The stress corresponding to 2 % stra
44、in is calculatedas follows:S53 PL/2 bd2where:S = stress in the outer fiber at 2 % strain,P = load corresponding to 2 % strain, N (lbf),L = test span = 50 mm (2 in.),d = specimen depth = 3.2 mm (18 in.), andb = specimen width = 12.7 mm (12 in.).The secant modulus at 2 % strain is the ratio of stress
45、tostrain or S/0.02.FIG. 2 Typical DSC PlotsD3350 12510.1.6 Tensile Strength at YieldThe tensile strength atyield and elongation at break shall be determined in accordancewith Test Method D638. The speed of testing shall be 500mm/min (20 in./min for materials in the density range from0.910 to 0.925 g
46、/cm3) and 50 mm/min (2 in./min for all others).Specimens shall conform to the dimensions given for Type IVin Test Method D638 with a thickness of 1.9 6 0.2 mm(0.075 6 0.008 in.). Specimen shall be either die cut ormachined.10.1.7 Slow Crack Growth ResistanceOne method shallbe used to classify this m
47、aterial property.10.1.7.1 Slow Crack Growth ResistanceThe materialsresistance shall meet the minimum requirement shown for theappropriate cell classification when tested in accordance withTest Method D1693.10.1.7.2 Slow Crack Growth ResistanceThe average fail-ure time from two test specimens shall m
48、eet the minimumrequirement shown for the appropriate cell classification whentested in accordance with Test Method F1473. Test at least fourspecimens in case of a dispute.10.1.8 Hydrostatic Strength ClassificationOne methodshall be used to classify this material property.10.1.8.1 Hydrostatic Design
49、BasisDetermine the hydro-static design basis in accordance with Test Method D2837,onpipe extruded from three different lots of material. Subjectspecimens from one lot for at least 10 000 h. Terminate thetests on the two additional lots after 2000 h. The results fromeach of the three lots shall be within the same or next highercell limits.NOTE 11For pressure application at elevated temperatures, the hydro-static design basis should be determined at that temperature in accordancewith Test Method D2837. The 100 000-h intercept should be categori
