ISO 1833-21-2019 PDF

Full title and description

Textiles — Quantitative chemical analysis — Part 21: Mixtures of chlorofibres, certain modacrylics, certain elastanes, acetates, triacetates with certain other fibres (method using cyclohexanone). This part of ISO 1833 specifies a chemical dissolution method (cyclohexanone) to determine the mass percentage of the listed thermoplastic and semi‑synthetic fibres in mixed textile constructions after removal of non‑fibrous matter.

Abstract

This document specifies a method, using cyclohexanone, to determine the mass percentage of chlorofibre, modacrylic, elastane, acetate and triacetate after removal of non‑fibrous matter in textiles made of mixtures of acetate, triacetate, chlorofibre, certain modacrylics and certain elastanes with wool, animal hair, silk, cotton, cupro, modal, viscose, lyocell, polyamide, acrylic, melamine, polyacrylate and glass fibres. It notes that mixtures containing chlorofibres can alternatively be analysed by ISO 1833‑13 or ISO 1833‑17 where appropriate.

General information

• Status: Published (Edition 2) — confirmed as current following ISO review.
• Publication date: 12 April 2019.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.060.01 (Textile fibres in general).
• Edition / version: Edition 2 (2019).
• Number of pages: 5.

Key bibliographic and status details above are based on the ISO record for ISO 1833‑21:2019.

Scope

Provides a procedure using cyclohexanone to dissolve and quantify specific fibre types (chlorofibres, certain modacrylics, certain elastanes, acetate and triacetate) in textile mixtures with a wide range of other fibres (natural, regenerated and synthetic). The method requires removal of non‑fibrous matter prior to analysis and includes guidance on preliminary tests (for example to verify complete solubility of some modacrylics and elastanes) and on when alternative ISO 1833 parts (notably ISO 1833‑13 and ISO 1833‑17) are applicable.

Key topics and requirements

• Selective dissolution using cyclohexanone as the reagent to separate target fibres from mixtures.
• Determination of mass percentage of chlorofibre, modacrylic, elastane, acetate and triacetate after removal of non‑fibrous matter.
• Sample pre‑treatment and removal of oils, waxes and water‑soluble matters prior to analysis (per general ISO 1833 principles).
• Requirement for preliminary solubility checks when modacrylics or elastanes are present to ensure complete dissolution.
• Guidance on applicability limits and cross‑references to other ISO 1833 parts for certain mixtures (e.g., ISO 1833‑13 and ISO 1833‑17 for chlorofibres).
• Designed for both binary and appropriate multi‑component mixtures when used with other ISO 1833 methods.

Typical use and users

Used by textile testing laboratories, quality control teams in fibre and textile manufacturing, import/export compliance and labelling authorities, forensic laboratories investigating fibre composition, and research groups studying fibre blends and recycling feedstock composition. It is applied where accurate quantitative composition of mixed textiles is required for specification, conformity, or material identification.

Related standards

Part of the ISO 1833 series (Quantitative chemical analysis). Key related items include ISO 1833‑1 (general principles of testing), ISO 1833‑13 and ISO 1833‑17 (alternative procedures for certain chlorofibre mixtures), and other numbered parts of ISO 1833 that address specific fibre combinations and methods. Regional/adopted versions exist as EN/ISO adoptions (e.g., EN ISO 1833‑21).

Keywords

ISO 1833‑21, textiles, quantitative chemical analysis, cyclohexanone, chlorofibre, modacrylic, elastane, acetate, triacetate, fibre composition, textile testing, ISO 1833 series.

FAQ

Q: What is this standard?

A: ISO 1833‑21:2019 is an international standard that specifies a cyclohexanone‑based chemical method for determining the mass percentage of certain synthetic and semi‑synthetic fibres in mixed textile materials.

Q: What does it cover?

A: It covers sample pre‑treatment (removal of non‑fibrous matter), selective dissolution of target fibres with cyclohexanone, and calculation of mass percentages for chlorofibres, selected modacrylics, certain elastanes, acetate and triacetate in mixtures with a broad range of other fibres. It also indicates when other ISO 1833 parts should be used.

Q: Who typically uses it?

A: Accredited textile testing laboratories, manufacturers for quality control, regulators and customs for compliance and labelling, forensic analysts, and researchers working on textile composition and recycling.

Q: Is it current or superseded?

A: ISO 1833‑21:2019 (Edition 2) is the current version; the 2006 edition was withdrawn and replaced by the 2019 edition. The ISO record shows the 2019 edition as published and subsequently reviewed/confirmed.

Q: Is it part of a series?

A: Yes — it is one part of the ISO 1833 series (Textiles — Quantitative chemical analysis). Part 1 provides general principles and other numbered parts address specific fibre combinations and methods (for example ISO 1833‑1:2020 for general principles).

Q: What are the key keywords?

A: cyclohexanone, quantitative chemical analysis, chlorofibre, modacrylic, elastane, acetate, triacetate, textile composition, ISO 1833.