Name: ISO 1628-1:2024 — Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers — Part 1: General principles
SKU: ISO 1628-1:2024
Price: 25 EUR
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Overview

ISO 1628-1:2024 defines the general principles for determining the viscosity of organic polymers in dilute solution using capillary viscometers. The standard covers measurement and reporting of reduced viscosity, intrinsic viscosity and K‑value, and specifies the standard parameters, apparatus and procedural conditions to obtain reproducible viscosity data. It applies both to development of polymer-specific measurement standards and to routine viscosity reporting when no dedicated standard exists.

Keywords: ISO 1628-1, viscosity of polymers, capillary viscometers, intrinsic viscosity, reduced viscosity, K-value.

Key Topics

Measurement methods
- Method A - Efflux time method: uses a capillary-tube viscometer to compare efflux times of solvent and polymer solution. The standard notes the Poiseuille/Hagenbach relation and treats kinetic-energy corrections as negligible when below 3% of solvent viscosity.
- Method B - Differential pressure method: a two-capillary relative viscometer measures differential pressures for solvent and solution under forced flow; designed for easier automation and reduced solvent use.
Apparatus and preparation
- Specifications for viscometers and supporting instrumentation for both efflux-time and differential-pressure approaches.
- Guidance on solution preparation and recommended concentration ranges for dilute-solution measurements.
Measurement conditions
- Controlled temperature of measurement, attention to solvent and solution densities (document notes limits such as density differences

ISO 1628-1:2024 PDF

Abstract

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