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ASTM D4603-03

Historical Revision

Standard Test Method for Determining Inherent Viscosity of Poly(Ethylene Terephthalate) (PET) by Glass Capillary Viscometer

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1.1 This test method is for the determination of the inherent viscosity of poly(ethylene terephthalate) (PET) soluble at 0.50 % concentration in a 60/40 phenol/1,1,2,2-tetrachloroethane solution by means of a glass capillary viscometer. Highly crystalline forms of PET that are not soluble in this solvent mixture will require a different procedure.

1.2 The inherent viscosity values obtained by this test method are comparable with those obtained using differential viscometry described in Test Method D 5225.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 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.


The inherent viscosity is relatable to the composition and molecular weight of a polyester resin. It must be controlled so that the processability and end properties of the resin remain in a desired range.

SDO ASTM: ASTM International
Document Number D4603
Publication Date March 10, 2003
Language en - English
Page Count 4
Revision Level 03
Supercedes
Committee D20.70
Publish Date Document Id Type View
May 1, 2018 D4603-18 Revision
Nov. 15, 2011 D4603-03R11E01 Revision
March 10, 2003 D4603-03 Revision
Nov. 10, 1996 D4603-96 Revision