1、Designation: D 3350 08Standard Specification forPolyethylene Plastics Pipe and Fittings Materials1This standard is issued under the fixed designation D 3350; 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 (e) 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 classi
3、fication 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 rec
4、yclable (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 D 5033 f
5、or information and definitions related torecycled plastics.1.31.4 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-priate safety and health practices and determine the applica
6、-bility of regulatory limitations prior to use.NOTE 3There is no similar or equivalent ISO standard.1.5 For information regarding molding and extrusion mate-rials see Specification D 4976. For information regarding wireand cable materials see Specification D 1248.2. Referenced Documents2.1 ASTM Stan
7、dards:2D 618 Practice for Conditioning Plastics for TestingD 638 Test Method for Tensile Properties of PlasticsD 746 Test Method for Brittleness Temperature of Plasticsand Elastomers by ImpactD 790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating
8、MaterialsD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 883 Terminology Relating to PlasticsD 1238 Test Method for Melt Flow Rates of Thermoplasticsby Extrusion PlastometerD 1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire
9、 and CableD 1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD 1603 Test Method for Carbon Black Content in OlefinPlasticsD 1693 Test Method for Environmental Stress-Cracking ofEthylene PlasticsD 1898 Practice for Sampling of Plastics3D 2837 Test Method for Obtaining Hydrost
10、atic DesignBasis for Thermoplastic Pipe Materials or Pressure DesignBasis for Thermoplastic Pipe ProductsD 2839 Practice for Use of a Melt Index Strand for Deter-mining Density of PolyethyleneD 3892 Practice for Packaging/Packing of PlasticsD 4218 Test Method for Determination of Carbon BlackContent
11、 in Polyethylene Compounds By the Muffle-Furnace TechniqueD 4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens, Plaques, or SheetsD 4883 Test Method for Density of Polyethylene by theUltrasound TechniqueD 4976 Specification for Polyethylene Plastics Molding andExtrusion
12、 MaterialsD 5033 Guide for Development of ASTM Standards Relat-ing to Recycling and Use of Recycled Plastics3F 1473 Test Method for Notch Tensile Test to Measure theResistance to Slow Crack Growth of Polyethylene Pipesand Resins2.2 ISO Standard:ISO 12162 Thermoplastic Materials for Pipes and Fitting
13、sfor Pressure ApplicationsClassification andDesignationOverall Service (Design) Coefficient3. Terminology3.1 DefinitionsTerms as described in Terminology D 883shall apply in this specification.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibi
14、lity of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved April 1, 2008. Published May 2008. Originallyapproved in 1974. Last previous edition approved in 2006 as D 3350 - 06.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at
15、 serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.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
16、 19428-2959, United States.3.1.1 polyethylene plasticsas defined by this specification,plastics or resins prepared by the polymerization of no less than85 % ethylene and no less than 95 % of total olefins withadditional compounding ingredients.3.2 Definitions of Terms Specific to This Standard:3.2.1
17、 materialspolyethylene (PE) resins with the addedcompounding ingredients.3.2.2 PE compoundshas the same meaning as PE plasticsmaterials, compounds, and plastics.3.3 Historical usage and user group conventions have re-sulted in inconsistent terminology used to categorize anddescribe polyethylene resi
18、ns and compounds. The followingterminology is in use in ASTM specifications pertaining topolyethylene:3.3.1 Specification D 1248:3.3.1.1 Type (0, I, II, III, IV) = density ranges (same,respectively, as Class in Specification D 4976).3.3.1.2 Class (A, B, C, D) = composition and use.3.3.1.3 Category (
19、1, 2, 3, 4, 5) = melt index ranges (same asGrade in Specification D 4976).3.3.1.4 Grade (E, J, D, or W followed by one or two digits)= specific requirements from tables.3.3.2 Specification D 3350:3.3.2.1 Type (I, II, III) = density ranges (same as Types I, II,and III in Specification D 1248 and Clas
20、ses 1, 2, and 3 inSpecification D 4976).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, E) denoting color and UV stabilizer.3.3.2.3 Grade = simplified line callout system using “PE”followed by density and slow crack growth c
21、ell numbers fromTable 1.3.3.3 Specification D 4976:3.3.3.1 Group (1, 2) = branched or linear polyethylene.3.3.3.2 Class (0, 1, 2, 3, 4) = density ranges (same,respectively, as Type in Specification D 1248).3.3.3.3 Grade (1, 2, 3, 4, 5) = melt index ranges (same asCategory in Specification D 1248).4.
22、 Classification4.1 Polyethylene plastic pipe and fittings compounds areclassified in accordance with density, melt index, flexuralmodulus, tensile strength at yield, slow crack growth resis-tance, and hydrostatic strength classification in Table 1.NOTE 4It has been a long-standing practice to use th
23、e 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 DensityNOTE 5The manner in which materials are identified in the cellclassification is illustrated for Class PE233424B as follows (refer
24、 also toTable 1 and 6.2):TABLE 1 Primary PropertiesACell Classification LimitsProperty Test Method 0 1 2 3 4 5 6 7 81. Density, g/cm3D 1505 Unspecified 0.925 orlower0.925-0.9400.940-0.9470.947-0.9550.955 . . . SpecifyValue2. Melt index D 1238 Unspecified 1.0 1.0 to0.41103(160 000)SpecifyValue4. Tens
25、ile strengthat yield, MPa (psi)D 638 Unspecified 28(4000)SpecifyValue5. Slow CrackGrowth ResistanceI. ESCR D 1693 Unspecifieda. Test condition(100% Igepal.)A B C C . . . . . . . . . SpecifyValueb. Test duration, h 48 24 192 600c. Failure, max, % Unspecified 50 50 20 20II. PENT (hours) F 1473Molded p
26、laque,80C, 2.4 MPaUnspecified . . . . . . . . . 10 30 100 500 SpecifyValueNotch depth,F 1473, Table 1Unspecified6. Hydrostatic StrengthClassificationI. Hydrostatic designbasis, MPa (psi), (23C)D 2837 NPRC5.52(800)6.89(1000)8.62(1250)11.03(1600). .II. Minimum requiredstrength, MPa (psi), (20C)ISO 121
27、62 . . . . . 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 at yield, and elongation at break.BRe
28、fer to 10.1.4.1.CNPR = Not Pressure Rated.D 3350 0824.2 Materials used in polyethylene plastic pipe and fittingsshall use a cell-type format for the identification, close char-acterization, and specification of material properties. Theinformation from the format is to be used alone or incombination.
29、NOTE 6This type format, however, is subject to possible misapplica-tion since unobtainable property combinations can be selected if the useris not familiar with commercially available materials. The manufacturershould be consulted. Additionally, the appropriate ASTM standard speci-fication should be
30、 reviewed to assure materials utilized will meet all thematerial and piping requirements as specified in the standard.4.3 GradeA code for polyethylene pipe and fittings ma-terials that consists of the two letter abbreviation for polyeth-ylene (PE) followed by two numbers that designate the densityce
31、ll (Property 1) and the slow crack growth resistance cell(Property 5), as defined by either Test Method F 1473 or TestMethod D 1693, of the thermoplastic, as specified in Table 1.For the requirements of Property 5 (slow crack growth resis-tance), consult the materials section of the appropriate ASTM
32、standard specification for the end-use application.NOTE 7Grade designations were adapted from SpecificationD 1248 - 84 prior to the removal of pipe material from D 1248 - 84.Former Specification D 1248 - 84 grades for PE pipe materials were P14,P23, P24, P33, and P34. Equivalent Specification D 3350
33、 grade designa-tions for these materials are PE11, PE20, PE23, PE30, and PE33,respectively.5. Materials and Manufacture5.1 The molding and extrusion material shall be polyethyl-ene plastic in the form of powder, granules, or pellets.5.2 The molding and extrusion materials shall be as uniformin compo
34、sition and size and as free of contamination as isachieved by good manufacturing practice. If necessary, thelevel of contamination may be agreed upon between themanufacturer and the purchaser.5.3 When specified, the color and translucence of molded orextruded pieces formed, under the conditions spec
35、ified by themanufacturer of the materials, shall be comparable withincommercial match tolerances to the color and translucence ofstandard samples supplied in advance by the manufacturer ofthe material.6. Physical Properties6.1 Cell ClassificationTest values for specimens of the PEmaterial prepared a
36、s specified in Section 9 and tested inaccordance with Section 10 shall conform to the requirementsgiven in Table 1. A typical property value for a PE material isto be the average value from testing numerous lots or batchesand determines the cell number. When, due to manufacturingtolerances and testi
37、ng bias, individual lot or batch values fallinto the adjoining cell, the individual value shall not beconsidered acceptable unless the user, or both the user and theproducer, determine that the individual lot or batch is suitablefor its intended purpose.6.2 Color and Ultraviolet (UV) StabilizerThe c
38、olor andUV stabilization shall be indicated at the end of the cellclassification by means of a letter designation in accordancewith the following code:Code Letter Color and UV StabilizerA NaturalB ColoredC Black with 2 % minimum carbon blackD Natural with UV stabilizerE Colored with UV stabilizer6.3
39、 Thermal StabilityThe PE material shall contain suffi-cient antioxidant so that the minimum induction temperatureshall be 220C when tested in accordance with 10.1.9.6.4 Brittleness TemperatureThe brittleness temperatureshall not be warmer than 60C when tested in accordancewith Test Method D 746.6.5
40、DensityThe density used to classify the material shallbe the density of the PE base resin (uncolored PE) determinedin accordance with 10.1.3. When the average density of any lotor shipment falls within 60.002 g/cm3of the nominal value, itshall be considered as conforming to the nominal value and toa
41、ll classifications based on the nominal value.6.5.1 For black compounds, containing carbon black, deter-mine the density, Dp, and calculate the resin density, Dr,asfollows:Dr5Dp20.0044Cwhere:C = weight percent of carbon black.6.5.2 For colored compounds, the nominal density of thebase resin shall be
42、 provided by the manufacturer, on request.6.6 Tensile Strength at YieldThe tensile strength at yieldused to classify the material shall be the tensile strength at yieldof the PE resin determined in accordance with 10.1.6. Whenthe average tensile strength at yield of any lot or shipment fallswithin 6
43、3.45 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 accordance with10.1.6, all pressure rated materials shall have a minimumextension at break of 500 % as determine
44、d by grip separation.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 upon between the manufacturerand the purchaser, the material shall be sampled i
45、n accordancewith the procedure described in Sections 9 through 12 ofPractice D 1898. Adequate statistical sampling prior to pack-aging shall be considered an acceptable alternative.D 3350 083NOTE 8A sample taken from finished product may not necessarilyrepresent the original batch or lot.8. Number o
46、f 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 material to thesatisfaction of the purchaser shall be required. On
47、e 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 Section 10, the test speci-mens shall be molded in accordance with P
48、rocedure C ofAnnex A1 of Practice D 4703.9.2 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 enumerated in this specification shall bedetermined in accordance wit
49、h 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 of Practice D 618.10.1.2 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 D 1505 or alternative meth-ods referenced in 2.1 (see D 792, D 2839, and D 4883)providing equivalent accur
