Significance and Use
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.
1. Scope
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.
2. Referenced Documents
ISO Standard
NIST Standard
C602 Testing of Glass Volumetric Apparatus
ASTM Standards
D1972 Practice for Generic Marking of Plastic Products
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and the Calculation of Dynamic Viscosity)
D446 Specification for Operating Instructions for Glass Capillary Kinematic Viscometers
D5225 Test Method for Measuring Solution Viscosity of Polymers with a Differential Viscometer
E1 Specification for ASTM Thermometers
E380 Practice for Use of the International System of Units (SI)
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
Index Terms
glass capillary viscometer; inherent viscosity; poly-(ethylene terephthalate); PET; solution viscosity; ICS Number Code 83.080.20 (Thermoplastic materials)
DOI: 10.1520/D4603-03
ASTM International is a member of CrossRef.
Citing ASTM Standards
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