Plastics; determination of vicosity number and limiting viscosity number; part 3: polyethylenes and polypropylenes

This document establishes a standardized methodology for determining the viscosity and intrinsic viscosity of thermoplastic materials, specifically focusing on polyethylene and polypropylene. It outlines the precise experimental procedures required to measure these critical rheological properties, which are essential for characterizing polymer molecular weight and flow behavior. The scope covers the preparation of polymer solutions, the selection of appropriate viscometers, and the calculation of viscosity values based on flow time measurements. By adhering to the specified protocols, laboratories can ensure consistency and comparability of test results across different facilities and regions. The methodology addresses various concentration levels to facilitate the extrapolation to intrinsic viscosity, providing a reliable basis for quality control and material specification in the plastics industry. This technical specification serves as a reference for testing protocols without including commentary on its necessity or significance, focusing solely on the operational steps and measurement principles required for accurate data generation in polymer analysis.