1、Designation:D743612Standard Classification System forUnfilled Polyethylene Plastics Molding and ExtrusionMaterials with a Fractional Melt Index Using ISO Protocoland Methodology1This standard is issued under the fixed designation D7436;the number immediately following the designation indicates the y
2、ear 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()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThis material specification is intended to provide a callou
3、t system for polyethylene utilizingspecimen preparation procedures and test methods based primarily on ISO standards.1.Scope*1.1 This classification system provides for the identificationof unfilled polyethylene plastics molding and extrusionmaterials,with a melt index of 7to#11 melt flow rate(190C/
4、21.6Kg).NOTE4It is recognized that some high-density polyethylene plasticsof very high molecular weight may have densities slightly less than 0.960,yet in all other respects they are characteristic of Class 4 materials.Similarly,there are other polyethylene plastics of very high molecularweight havi
5、ng densities less than 0.941 that,in all other aspects,are morecharacteristic of Class 2 than of Class 3 materials.NOTE5Use the following terms in describing polyethylene plastics:Class 1(0.910 to 0.925)=low densityClass 2(0.925 to 0.940)=medium densityClass 3(0.940 to 0.960)=high density-low rangeC
6、lass 4(0.960)=high density-high range4.1.1 Specific requirements for variations of polyethylenematerials shall be indicated by a six-character designator.Thedesignation will consist of the letter“A”and the five digitscomprising the cell numbers for the property requirements inthe order as they appea
7、r in Table A.4.1.2 Although the values listed are necessary to include therange of properties available in the existing materials,usersshall not assume that every combination of properties areattainable or exist.4.1.3 When the cell designation is not known or is notrequired,the use of a“0”designatio
8、n shall be used(see Note6).NOTE6An example of a high density polyethylene material of thisclassification system is as follows.The designation D7436 PE230A34350would indicate the following material requirements from Table A:PE230=High Density Polyethylene,from Table PE of this standard,A=Table A for
9、property requirements,3=tensile strength,12 MPa,min,4=tensile break elongation,400%,min,3=tensile modulus,200 MPa,min,5=environmental stress-crack resistance,336 F50hours,min0=unspecifiedIf no properties are specified,the designation would be D7436PE230A00000.D7436 122 TABLE PE Basic Requirement of
10、Polyethylene PlasticsGroupDescriptionClassDescriptionGradeMeltFlowRateAMeltFlowRateBTensileStress atYield,CMPa,minNominalStrain atBreak,C%,minTensileModulus,DMPa,min1Branched1LowDensity1#7.0.910#0.92527#1131140.1#0.49.540050.4#19.530002MediumDensity1#70.925#0.94027#1131140.1#0.41140050.4#11120000oth
11、er02Linear1LowDensity1#70.910#0.92527#1131140.1#0.41150050.4#11140020002MediumDensity1#70.925#0.94027#1131140.1#0.41640060050.4#11620050003HighDensity1#7207000.940#0.96027#11239003112390040.1#0.424600100050.4#125400110004HighDensity1#70.96027#1131140.1#0.42840050.4#128300120000other000Other0other0AI
12、SO 1133 melt flow rate=g/10 min at 190C/21.6 Kg.BISO 1133 melt flow rate=g/10 min at 190C/2.16 Kg.CISO 3167,Type 1B tensile bars,HDPE and MDPE tested at 50 mm/min.For densities#0.925 test at 500 mm/min.DISO 527-1 and ISO 527-2 at 1 mm/min strain rate,chord modulus between 0.05%and 0.25%strain.D7436
13、123 TABLE ADetail RequirementsAfor Polyethylene PlasticsDesignation orOrder No.Property01234567891Tensile stress at yield,BMPa ISO 527-1 and ISO 527-2,minunspecified481216213035specify valueC2Nominal strain at break,B%,ISO 527-1 and ISO 527-2,minunspecified25502004006008001000specify valueC3Tensile
14、Modulus,DMPa,ISO 527-1 and ISO 527-2,minunspecified501002004006008001000specify valueC4FEnvironmental stress-crack resistance,hrs,min F50,ETest Method D1693unspecified2448961683366721008specify valueC5To be determinedunspecifiedspecify valueCAIt is recognized that detailed test values may not predic
15、t nor even correlate with performance of parts molded of these materials.BISO 3167,Type 1B tensile bars,HDPE and MDPE tested at 50 mm/min.For densities 0.925 test at 500 mm/min.CIf a specific value is required,it must appear on the drawing or contract,or both.DISO 527-1 and ISO 527-2 at 1 mm/min str
16、ain rate,chord modulus between 0.05%and 0.25%strain.EF50is the time required for failure of 50%of the samples tested in accordance with Test Method D1693 using undiluted Igepal CO-630.Mold samples in accordancewith Procedure C of Practice D4703,Annex A1.FThere are environmental concerns regarding the disposal of Polyoxyethylated Nonylphenol(Nonylphenoxy poly(ethyleneoxy)ethanol(CAS 68412-54-4)e.g.IgepalCO-630).Users are advised to consult their supplier or local environmental office and follow t
