ISO 1833-6:2018
(Main)Textiles - Quantitative chemical analysis - Part 6: Mixtures of viscose, certain types of cupro, modal or lyocell with certain other fibres (method using formic acid and zinc chloride)
Textiles - Quantitative chemical analysis - Part 6: Mixtures of viscose, certain types of cupro, modal or lyocell with certain other fibres (method using formic acid and zinc chloride)
This document specifies a method, using a mixture of formic acid and zinc chloride, to determine the mass percentage of viscose, certain types of cupro, modal or lyocell, after removal of nonfibrous matter, in textiles made of mixtures of - viscose, certain types of cupro, modal or lyocell, with - cotton. This document has been initially specifically established for mixtures of viscose, certain types of cupro, modal or lyocell with cotton, it is also applicable to mixtures with polypropylene, elastolefin and melamine. IMPORTANT - If a cupro or modal or lyocell fibre is found to be present, a preliminary test is carried out to see whether it is soluble in the reagent. The method is not applicable to mixtures in which the cotton has suffered extensive chemical degradation. It is not applicable when the viscose, cupro, modal or lyocell fibre is rendered incompletely soluble by the presence of certain permanent finishes or reactive dyes that cannot be removed completely.
Textiles — Analyse chimique quantitative — Partie 6: Mélanges de viscose, certains types de cupro, modal ou lyocell avec certaines autres fibres (méthode à l'acide formique et au chlorure de zinc)
Le présent document spécifie une méthode de détermination, à l'aide d'un mélange d'acide formique et de chlorure de zinc, de la masse exprimée en pourcentage de la viscose, ou de certains types de cupro, modal ou lyocell, après élimination des matières non fibreuses, dans les textiles composés de mélanges de: — viscose, certains types de cupro, modal ou lyocell; avec — coton. Initialement, le présent document a été spécifiquement élaboré pour les mélanges de viscose, certains types de cupro, modal ou lyocell avec du coton. Il est également applicable aux mélanges avec du polypropylène, de l'élastoléfine et de la mélamine. IMPORTANT — Si la présence de fibres de cupro, de modal ou de lyocell est constatée, un essai préliminaire est effectué pour déterminer si celles-ci sont solubles dans le réactif. Cette méthode n'est pas applicable aux mélanges dans lesquels le coton a subi une dégradation chimique importante. Elle n'est pas applicable lorsque la présence de certains produits d'apprêt permanents ou de colorants réactifs qui ne peuvent être éliminés complètement empêche la dissolution complète des fibres de viscose, de cupro, de modal ou de lyocell.
General Information
- Status
- Published
- Publication Date
- 17-Oct-2018
- Technical Committee
- ISO/TC 38 - Textiles
- Drafting Committee
- ISO/TC 38/WG 22 - Composition and chemical testing
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 20-Jun-2024
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 06-Jun-2022
- Effective Date
- 09-Apr-2016
Overview
ISO 1833-6:2018 specifies a precise chemical analysis method for determining the mass percentage of specific regenerated cellulose fibres-namely viscose, certain types of cupro, modal, or lyocell-in textile mixtures. Utilizing a reagent solution composed of formic acid and zinc chloride, this standard is primarily designed for mixtures involving these fibres combined with cotton. Additionally, it applies to blends with polypropylene, elastolefin, and melamine.
The method involves dissolving the target regenerated cellulose fibres from a known dry mass of a textile mixture, filtering, washing, drying, and weighing the residual fibres. This process enables accurate quantitative measurement of the fibre content after the removal of nonfibrous matter.
ISO 1833-6:2018 offers textile manufacturers, quality control laboratories, and materials researchers a reproducible, standardized procedure for assessing blended textiles with complex fibre compositions.
Key Topics
Scope and Applicability
- Quantitative chemical analysis of viscose, certain types of cupro, modal, and lyocell fibres mixed predominantly with cotton.
- Also applicable to mixtures with polypropylene, elastolefin, and melamine fibres.
- Not suitable for cotton that has undergone extensive chemical degradation or where permanent finishes/reactive dyes hinder fibre solubility.
Chemical Reagents
- Main reagent: a mixture of formic acid and anhydrous zinc chloride (minimum 98% assay).
- Ammonia dilute solution used for neutralisation and residue treatment after fibre dissolution.
Testing Procedure
- Preheating samples and reagents to 70 °C to optimize fibre solubility.
- Shaking and incubating textile specimens with the reagent to dissolve targeted fibres.
- Filtration and thorough washing to isolate residues corresponding to non-dissolved constituents.
- Neutralisation of residue with cold ammonia solution, followed by drying and precise weighing.
Calculation and Results
- Mass percentage of viscose, cupro, modal, or lyocell is determined by difference relative to the original dry sample mass.
- Correction factors applied for certain fibres (e.g., cotton d-factor = 1.03, melamine d-factor = 1.01).
- Method precision validated with confidence limits within ±2 percentage points at 95% confidence level.
Limitations and Preliminary Testing
- Prior solubility tests recommended if cupro, modal, or lyocell fibres are present to ensure reagent effectiveness.
- Not applicable when permanent finishes or dyes prevent complete fibre dissolution.
Applications
Textile Quality Control
Ensures accurate fibre content labelling and compliance with fabric composition claims, essential for consumer transparency and regulatory adherence.Material Research and Development
Facilitates the development of novel textile blends by allowing precise quantification of regenerated cellulose fibres in combination with cotton and synthetic fibres.Authentication and Inspection
Useful in verifying textile fibre content in imported or exported goods, aiding customs and trade monitoring to prevent misclassification or fraud.Process Optimization in Textile Manufacturing
Enables manufacturers to monitor fibre mixtures during production, optimizing blending processes for consistent fabric quality.
Related Standards
ISO 1833-1: Textiles - Quantitative chemical analysis - Part 1: General principles of testing
Provides foundational principles and general procedures referenced by ISO 1833-6 for sample preparation, reagent handling, and calculation methods.Other ISO 1833 Series Parts
Covers chemical analysis methods for different fibre mixture types and compositions, offering a comprehensive framework for textile quantitative analysis.ISO/IEC Directives, Part 1 & 2
Governs rules for development and maintenance of ISO standards, ensuring consistency and global applicability across technical fields.
Keywords: ISO 1833-6, textile chemical analysis, viscose quantification, cupro fibre analysis, modal fibre testing, lyocell fibre measurement, formic acid zinc chloride method, fibre blend testing, cotton fibre mixtures, quantitative textile testing, regenerated cellulose fibres.
ISO 1833-6:2018 - Textiles — Quantitative chemical analysis — Part 6: Mixtures of viscose, certain types of cupro, modal or lyocell with certain other fibres (method using formic acid and zinc chloride) Released:18. 10. 2018
ISO 1833-6:2018 - Textiles — Analyse chimique quantitative — Partie 6: Mélanges de viscose, certains types de cupro, modal ou lyocell avec certaines autres fibres (méthode à l'acide formique et au chlorure de zinc) Released:18. 10. 2018
Frequently Asked Questions
ISO 1833-6:2018 is a standard published by the International Organization for Standardization (ISO). Its full title is "Textiles - Quantitative chemical analysis - Part 6: Mixtures of viscose, certain types of cupro, modal or lyocell with certain other fibres (method using formic acid and zinc chloride)". This standard covers: This document specifies a method, using a mixture of formic acid and zinc chloride, to determine the mass percentage of viscose, certain types of cupro, modal or lyocell, after removal of nonfibrous matter, in textiles made of mixtures of - viscose, certain types of cupro, modal or lyocell, with - cotton. This document has been initially specifically established for mixtures of viscose, certain types of cupro, modal or lyocell with cotton, it is also applicable to mixtures with polypropylene, elastolefin and melamine. IMPORTANT - If a cupro or modal or lyocell fibre is found to be present, a preliminary test is carried out to see whether it is soluble in the reagent. The method is not applicable to mixtures in which the cotton has suffered extensive chemical degradation. It is not applicable when the viscose, cupro, modal or lyocell fibre is rendered incompletely soluble by the presence of certain permanent finishes or reactive dyes that cannot be removed completely.
This document specifies a method, using a mixture of formic acid and zinc chloride, to determine the mass percentage of viscose, certain types of cupro, modal or lyocell, after removal of nonfibrous matter, in textiles made of mixtures of - viscose, certain types of cupro, modal or lyocell, with - cotton. This document has been initially specifically established for mixtures of viscose, certain types of cupro, modal or lyocell with cotton, it is also applicable to mixtures with polypropylene, elastolefin and melamine. IMPORTANT - If a cupro or modal or lyocell fibre is found to be present, a preliminary test is carried out to see whether it is soluble in the reagent. The method is not applicable to mixtures in which the cotton has suffered extensive chemical degradation. It is not applicable when the viscose, cupro, modal or lyocell fibre is rendered incompletely soluble by the presence of certain permanent finishes or reactive dyes that cannot be removed completely.
ISO 1833-6:2018 is classified under the following ICS (International Classification for Standards) categories: 59.060.01 - Textile fibres in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 1833-6:2018 has the following relationships with other standards: It is inter standard links to ISO 18473-2:2015, ISO 1833-6:2007. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 1833-6:2018 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 1833-6
Second edition
2018-10
Textiles — Quantitative chemical
analysis —
Part 6:
Mixtures of viscose, certain types of
cupro, modal or lyocell with certain
other fibres (method using formic acid
and zinc chloride)
Textiles — Analyse chimique quantitative —
Partie 6: Mélanges de viscose, certains types de cupro, modal ou
lyocell avec certaines autres fibres (méthode à l'acide formique et au
chlorure de zinc)
Reference number
©
ISO 2018
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
6 Apparatus . 2
7 Test procedure . 2
8 Calculation and expression of results . 3
9 Precision . 3
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 38, Textiles.
This second edition cancels and replaces the first edition (ISO 1833-6:2007), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the title has been changed from “Mixtures of viscose or certain types of cupro or modal or lyocell
and cotton fibres.” to “Mixtures of viscose, certain types of cupro, modal or lyocell with certain
other fibres.”;
— in Clause 1, the list of fibres has been updated;
— Clause 3 (Terms and definitions) has been added;
— in 5.1, additional instruction in case of the u
...
NORME ISO
INTERNATIONALE 1833-6
Deuxième édition
2018-10
Textiles — Analyse chimique
quantitative —
Partie 6:
Mélanges de viscose, certains types de
cupro, modal ou lyocell avec certaines
autres fibres (méthode à l'acide
formique et au chlorure de zinc)
Textiles — Quantitative chemical analysis —
Part 6: Mixtures of viscose, certain types of cupro, modal or lyocell
with certain other fibres (method using formic acid and zinc chloride)
Numéro de référence
©
ISO 2018
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2018
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
Fax: +41 22 749 09 47
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii © ISO 2018 – Tous droits réservés
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Principe . 2
5 Réactifs . 2
6 Appareillage . 2
7 Mode opératoire d’essai. 2
8 Calcul et expression des résultats . 3
9 Fidélité . 3
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes
nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est
en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.
L'ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www
.iso .org/directives).
L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de
droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de
brevets reçues par l'ISO (voir www .iso .org/brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion
de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles
techniques au commerce (OTC), voir www .iso .org/avant -propos.
Le présent document a été élaboré par le comité technique ISO/TC 38, Textiles.
Cette deuxième édition annule et remplace la première (ISO 1833-6:2007), qui a fait l’objet d’une
révision technique. Les principales modifications par rapport à l’édition précédente sont les suivantes:
— le titre a été modifié, de «Mélanges de viscose ou de certains types de cupro, modal ou lyocell et de
fibres de coton.» en «Mélanges de viscose, certains types de cupro, modal ou lyocell avec certaines
autres fibres.»;
— dans l’Article 1, la liste des fibres a été mise à jour;
— l’Article 3 (Termes et définitions) a été ajouté;
— en 5.1, une instruction additionnelle en cas d’utilisation de chlorure de zinc autre que du chlorure
de zinc anhydre fondu a été ajoutée;
— dans l’Article 7, la température d’essai de 40 °C a été supprimée et remplacée par 70 °C, et l’étape de
neutralisation a été détaillée;
— dans l’Article 8, un facteur d spécifique p
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