BS EN ISO 1628-3:2010

This standard BS EN ISO 1628-3:2010 Plastics. Determination of the viscosity of polymers in dilute solution using capillary viscometers is classified in these ICS categories:

• 83.080.20 Thermoplastic materials

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.

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.

NOTE Reduced viscosity is also known as the Staudinger function (J_v) and intrinsic viscosity as the Staudinger index (J_g).