ISO 3219-2-2021 PDF

Full title and description

Rheology — Part 2: General principles of rotational and oscillatory rheometry. This International Standard gives the general principles and foundational requirements for performing rotational and oscillatory rheometry measurements used to characterise the flow and viscoelastic behaviour of materials.

Abstract

This document specifies the general principles of rotational and oscillatory rheometry, including measurement modes, basic instrument considerations and the interpretation of common rheological quantities. Informative Annex A provides additional detail and examples; further technical requirements and methods are covered in other parts of the ISO 3219 series.

General information

• Status: Published.
• Publication date: May 2021 (ISO edition 1 — publication effective May 2021, often cited as 13 May 2021).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.080.01 (Plastics; rheology-related classification).
• Edition / version: Edition 1 (2021).
• Number of pages: 45 pages (official ISO PDF); note that national adoptions/publications may show slightly different page counts in their formatted publications.

Scope

The standard establishes the general principles for rotational and oscillatory rheometry: definitions of basic measurement modes, instrument and geometry considerations, control and measurement of shear and deformation, data acquisition and reporting of primary rheological quantities (e.g., shear stress, shear rate, complex modulus, storage and loss moduli). Detailed explanatory material is given in Annex A, and additional procedural parts of the ISO 3219 series provide specific test methods.

Key topics and requirements

• Definitions and terminology for rotational and oscillatory measurements (baseline vocabulary referenced in Part 1 of the series).
• General measurement modes: steady shear (rotational), small-amplitude oscillatory shear (SAOS) and related controlled-stress/controlled-rate modes.
• Instrument and geometry considerations: rotor/stator geometries, gap control, alignment, torque and angular displacement measurement requirements.
• Calibration and verification recommendations for torque, angular displacement and temperature control.
• Sample preparation, conditioning and reporting of test conditions (temperature, pre-shear, history effects).
• Primary data reporting: shear stress, shear rate, viscosity, complex viscosity, storage (G') and loss (G'') moduli, phase angle, and derived quantities.
• Guidance on data interpretation, limits of linear viscoelastic regime and common artefacts (edge effects, inertia, instrument compliance).
• Informative Annex A with expanded examples and illustrative discussions.

Typical use and users

This standard is used by rheologists, materials scientists, quality-control laboratories, R&D teams in polymers, paints, coatings, adhesives and other complex fluids and soft solids, and by instrument manufacturers and test-lab accreditors to ensure consistent measurement principles and reporting. It serves as a foundational reference when developing or adopting specific rheological test methods.

Related standards

ISO 3219 is a multi-part series. Relevant related documents include ISO 3219-1 (Vocabulary and symbols for rotational and oscillatory rheometry) and the withdrawn ISO 3219:1993 (replaced by the current series). National adoptions (EN/ISO, BS EN, DIN EN ISO, etc.) align this Part 2 text with regional publication formats.

Keywords

rheology; rotational rheometry; oscillatory rheometry; viscosity; viscoelasticity; shear rate; complex modulus; storage modulus; loss modulus; rheometer; measurement principles.

FAQ

Q: What is this standard?

A: ISO 3219-2:2021 is the International Standard that specifies the general principles for performing rotational and oscillatory rheometry measurements.

Q: What does it cover?

A: It covers fundamental measurement modes, instrument and geometry considerations, calibration and verification guidance, sample conditioning and primary data reporting and interpretation; Annex A provides additional explanatory material.

Q: Who typically uses it?

A: Laboratory scientists, technicians, instrument manufacturers, R&D and quality-control personnel in industries working with polymers, paints, coatings, adhesives, food and other complex fluids and soft solids.

Q: Is it current or superseded?

A: It is current (published in 2021) and replaces the earlier ISO 3219:1993; it is the active Part 2 text for general rheometry principles.

Q: Is it part of a series?

A: Yes — ISO 3219 is a multi-part series. Part 1 covers vocabulary and symbols; additional parts provide more specific methods and background.

Q: What are the key keywords?

A: Rheology; rotational/oscillatory rheometry; viscosity; viscoelasticity; complex modulus; storage modulus (G'); loss modulus (G'').