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Historical Revision

ASTM D6248-98(2012)e1

Standard Test Method for Vinyl and Trans Unsaturation in Polyethylene by Infrared Spectrophotometry
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1.1 This test method covers most types of polyethylene, those ethylene plastics consisting of ethylene and α-olefin comonomers longer than propylene, and blends of the above in any ratio.

1.2 The values stated in SI units are to be regarded as the standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 8.

Note 1—There is no known ISO equivalent for this standard.

1.1Thistestmethodcoversmosttypesofpolyethylene,thoseethyleneplasticsconsistingofethyleneandα-olefincomonomerslongerthanpropylene,andblendsoftheaboveinanyratio.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardsstatementsaregiveninSection8.Note1—ThereisnoknownISOequivalentforthisstandard.

Therearethreetypesofolefinicgroupspresentinsufficientconcentrationstowarrantconsideration,oneormoreofthatcannormallybefoundinanypolyethylene.Thethreetypesaretrans-vinylene,R-CH=CH-R′,sometimesreferredtoastrans-internalunsaturation;vinylideneorpendentmethylene,RR′C-CH2;andvinylunsaturation,R-CH=CH2,alsoreferredtoasterminalunsaturation.

Thetypeandquantityofthesegroupscaninfluencethechemicalandphysicalpropertiesoftheresin.Informationconcerningtheirpresencecanalsobeusedtocharacterizeoridentifyunknownresinsorblendsofresins.

Additivescaninterferewithunsaturationmeasurements.Theuseiscautionedtodeterminewhichadditivesarepresentandifthereanyabsorbancebandscausedbyadditivepresencethatoverlaporinterferewithunsaturationabsorbancebandsusedinthistestmethodintherangeof1050to850cm–1.Ifoverlappingbandsoccur,themethodisnotapplicable.

Interferencefringesresultingfromsmoothsamplesurfacescancausemeasurementerrors.Thistestmethodrequirestheuseofaluminumfoilinthecompressionmoldingofsamplestoprovideanadequatelyroughsurfacetominimizeinterferencefringes.

SDO ASTM: ASTM International
Document Number D6248
Publication Date May 1, 2012
Language en - English
Page Count 3
Revision Level 98(2012)e1
Supercedes
Committee D20.70
Publish Date Document Id Type View
Nov. 15, 2021 D6248-21 Revision
May 1, 2012 D6248-98R12E01 Revision
July 1, 2004 D6248-98R04 Revision
April 10, 1998 D6248-98 Revision