ISO 2475-2025 PDF

Full title and description

Chloroprene rubber (CR) — General-purpose types — Evaluation procedure. This International Standard specifies the physical and chemical tests, standard materials and formulations, equipment and processing methods used to evaluate the vulcanization characteristics and quality of general-purpose chloroprene rubbers (CRs).

Abstract

This document defines a harmonized evaluation procedure for general-purpose chloroprene rubber (CR), covering required tests on raw rubber, the use of specified standard materials and test formulations, and methods for assessing vulcanization behaviour (including cure characteristics). It provides requirements for the test equipment and processing conditions to ensure comparable test results across laboratories.

General information

• Status: Published (International Standard).
• Publication date: January 2025.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 83.060 (Rubber).
• Edition / version: Edition 6 (2025).
• Number of pages: 13 pages.

Technical committee: ISO/TC 45/SC 3. This edition replaces ISO 2475:2011.

Scope

Applies to general-purpose chloroprene rubbers (CR) and specifies the evaluation procedure used by manufacturers and testing laboratories to characterise raw CR and its vulcanization behaviour. The standard sets out the physical and chemical tests to be performed on raw rubber, prescribes standard materials and test formulations, and describes the equipment and processing methods required for consistent assessment of cure characteristics.

Key topics and requirements

• Definition of general-purpose chloroprene rubber (CR) types and intended evaluation context.
• Required physical and chemical tests on raw CR (composition checks, basic property measurements).
• Specification of standard materials and standard test formulations to be used for comparative evaluations.
• Procedures for preparing test compounds and vulcanization (mixing and processing conditions).
• Methods for measuring and reporting vulcanization/cure characteristics (curemeters, torque/viscosity measures, cure times and cure rates).
• Requirements for test equipment, calibration and laboratory reporting to ensure inter-laboratory comparability.

Key test-method references used in conjunction with this standard include curemeter and Mooney-viscosity techniques and standard procedures for test-mix preparation.

Typical use and users

Manufacturers of chloroprene rubber, compounders, quality-control and R&D laboratories, material specification writers, procurement and conformity assessment bodies use this standard to evaluate raw CR batches and to ensure consistent cure behaviour in formulation development and production acceptance testing. Test laboratories use the prescribed formulations and equipment settings to produce comparable cure-characteristic data for batch acceptance, supplier comparison and specification compliance.

Related standards

Standards commonly used alongside ISO 2475:2025 include ISO 2393 (rubber test mixes — preparation, mixing and vulcanization — equipment and procedures), standards for measurement of vulcanization characteristics using curemeters (ISO 6502 series / previously ISO 3417), Mooney-viscosity methods (ISO 289 series), and tensile/physical property tests (ISO 37). These related documents provide the specific test-method details and test-mix preparation procedures referenced by ISO 2475 for a complete test programme.

Keywords

Chloroprene rubber; CR; vulcanization; cure characteristics; curemeter; Mooney viscosity; test formulations; rubber test mixes; ISO/TC 45; rubber testing.

FAQ

Q: What is this standard?

A: ISO 2475:2025 is an International Standard titled "Chloroprene rubber (CR) — General-purpose types — Evaluation procedure" that defines the procedures, test formulations and equipment requirements used to evaluate general-purpose CR, with an emphasis on vulcanization behaviour and comparability of laboratory results.

Q: What does it cover?

A: It covers physical and chemical tests on raw chloroprene rubber, specification of standard materials and test formulations, preparation and processing methods, and measurement/reporting of vulcanization (cure) characteristics to support consistent evaluation across laboratories.

Q: Who typically uses it?

A: Rubber and elastomer manufacturers, compounders, quality and R&D laboratories, standards/specification authors, and testing/inspection bodies that need reproducible, comparable evaluation data for chloroprene rubber batches and formulations.

Q: Is it current or superseded?

A: It is current—published in January 2025—and replaces the previous edition ISO 2475:2011. Users should adopt the 2025 edition for the latest prescribed procedures.

Q: Is it part of a series?

A: ISO 2475:2025 sits within the suite of ISO standards for rubber testing (ICS 83.060) and is intended to be used together with related test-method standards (for example, standards covering curemeter methods, Mooney measurements and test-mix preparation). It is coordinated with other ISO technical work under ISO/TC 45.

Q: What are the key keywords?

A: Chloroprene rubber, CR, evaluation procedure, vulcanization, cure characteristics, curemeter, Mooney viscosity, rubber test mixes, ISO 2475:2025.