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Significance and Use
The logarithmic viscosity number provides information on the effect of compounding or processing of PVC.
Exposure of PVC compositions to shear or to high temperatures can result in a change in the logarithmic viscosity number of the resin.
1.1 This test method covers the determination of the logarithmic viscosity number of poly(vinyl chloride) (PVC) homopolymers after compounding or processing.
1.2 It is the basic assumption of this technique that the formulation of the compounded resin is known and that any additives present can be separated from the resin by extraction with diethyl ether. This is necessary to permit adjustment of the amount of sample used in the test to give a resin concentration in cyclohexanone of 0.2 ± 0.002 g/100 mL.
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 precautionary statements are given in 7.3 and 8.4.1. Note 1—This test method and ISO 1628-2 are not equivalent.
Note 1—This test method and ISO 1628-2 are not equivalent.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D446 Specifications and Operating Instructions for Glass Capillary Kinematic Viscometers
D1243 Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers
D2124 Test Method for Analysis of Components in Poly(Vinyl Chloride) Compounds Using an Infrared Spectrophotometric Technique
E1 Specification for ASTM Liquid-in-Glass Thermometers
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ISO Standard1628-2 Plastics--Determination of Viscosity Number and Limiting Viscosity Number--Part 2: Poly (Vinyl Chloride) Resins Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
ICS Number Code 83.080.20 (Thermoplastic materials)
UNSPSC Code 13102030(Polyvinyl Chloride PVC)