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ASTM

D2857-16

Standard Practice for Dilute Solution Viscosity of Polymers

2016

6

ASTM Vol.08.01 (2022)

This practice covers the determination of the dilute solution viscosity of polymers. There are several ASTM standards (Test Methods D789D1243D1601, and D4603, and Practice D3591) that describe dilute solution viscosity procedures for specific polymers, such as nylon, poly(vinyl chloride), polyethylene, and poly(ethylene terephthalate). This practice is written to augment these standards when problems arise with which the specific procedure is not concerned, or when no standard is available for the polymer under investigation. This practice is applicable to all polymers that dissolve completely without chemical reaction or degradation to form solutions that are stable with time at a temperature between ambient and 150°C. Results are usually expressed as relative viscosity (viscosity ratio), inherent viscosity (logarithmic viscosity number), or intrinsic viscosity (limiting viscosity number) (see 3.1). For polyamides, relative viscosity values by this procedure are not equivalent to those determined by Test Methods D789.

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