Historical
ISO 1628-3:2001
Plastics -- Determination of the viscosity of polymers in dilute solution using capillary viscometers -- Part 3: Polyethylenes and polypropylenes
This part of ISO 1628 defines particular conditions for determining the reduced viscosity (also known as viscosity number) and intrinsic viscosity of polyethylenes and polypropylenes at 135 °C in dilute solution. It is applicable to low, medium and high-density polyethylenes and to a wide range of polypropylenes, including pure isotactic, stereoblock and atactic polymers.
The viscosity of polymer solutions may be affected by additives present in the sample. The value of a reduced viscosity determined by this method may therefore be unreliable if the sample contains fillers or other additives.
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International Organization for Standardization [iso]
International Organization for Standardization [iso]
