MaTestLab > Test Standards > ASTM D4603 Determination of Inherent Viscosity of Poly(Ethylene Terephthalate) (PET) by Glass Capillary Viscometer 

ASTM D4603 Determination of Inherent Viscosity of Poly(Ethylene Terephthalate) (PET) by Glass Capillary Viscometer 

ASTM D4603 is a standardized test method used to determine the inherent viscosity of polyethylene terephthalate (PET) providing information about the molecular weight and polymer chain length of PET, which are crucial factors in assessing its processability and performance in various applications. The inherent viscosity of a polyester resin is relatable to its composition and molecular weight. PET samples soluble at 0.50 % concentration in a 60/40 phenol/1,1,2,2-tetrachloroethane solution are evaluated by ASTM D4603 test method by means of a glass capillary viscometer.

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Introduction to ASTM D4603

ASTM D4603 outlines a consistent and reliable procedure for evaluating the inherent viscosity of PET using a glass capillary viscometer. The test involves dissolving PET in a suitable solvent and measuring the flow time of the solution through a capillary under controlled conditions. Inherent viscosity assesses the mechanical, thermal, and barrier properties of PET ensuring its consistency for use in bottles, fibers, films, and other products 

ASTM D4603 test method is useful 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. The inherent viscosity value obtained through ASTM D4603 test method allows researchers and manufacturers to monitor the quality of PET and optimize its processing parameters for specific applications.

ASTM D4603 Test Method

The ASTM D4603 test method involves dissolving PET in a specified solvent and measuring its flow time through a glass capillary viscometer. The test is conducted as follows:

Solution PreparationA suitable solvent is chosen and the PET specimens are dissolved in the selected solvent to form a solution with a specified concentration. The solution is poured into a glass capillary viscometer, and the flow time is measured under controlled temperature and pressure conditions. 
Inherent Viscosity CalculationThe inherent viscosity of PET is calculated using the flow time data and the specifications of the glass capillary viscometer by comparing the flow time of the PET solution with that of the solvent alone.

ASTM D4603 Specimens

Specimen detailsASTM D4603 specimens are in the form of pellets or granules.
Specimen dimensionsThe dimensions and shape of the specimen are defined in the standard to ensure compatibility with the testing equipment.
Specimen preparationSpecimens are injection molded, machine operated, or cut from materials in sheet, plate, slab, or similar form.

ASTM D4603 Results

The results of the ASTM D4603 test provide the inherent viscosity value of the PET sample which directly influences its physical and mechanical properties. Higher inherent viscosity values typically correspond to higher molecular weight and longer polymer chains, resulting in improved strength and performance characteristics in PET-based products.

Tests Related to ASTM D4603
ASTM D1505 that provides guidelines for the determination of inherent viscosity of PET by solution viscosity is a related standard. The inherent viscosity values obtained by this test method are comparable with those obtained using differential viscometry described in Test Method ASTM D5225.

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The required number of samples or specimens should comply with the procedure given in the astm d4603 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

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Where can I get the astm d4603 tested?

You can share your astm d4603 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d4603 test to various testing techniques.

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