EN ISO 1833-6:2019

• Abstract:

  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.

• Status: Published
• Publication Date: 26-Mar-2019
• Withdrawal Date: 29-Sep-2019
• ICS: 59.060.01 - Textile fibres in general
• Technical Committee: CEN/TC 248 - Textiles and textile products
• Drafting Committee: CEN/TC 248 - Textiles and textile products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 27-Mar-2019
• Completion Date: 27-Mar-2019
• Directive: Not Harmonized1007/2011 - Regulation (EU) No 1007/2011 of the European Parliament and of the Council of 27 September 2011 on textile fibre names and related labelling and marking of the fibre composition of textile products and repealing Council Directive 73/44/EEC and Directives 96/73/EC and 2008/121/EC of the European Parliament and of the Council
• Mandate: M/532 - [C(2015)1385] Standardisation request to the European Committee for Standardisation as regards methods for quantitative analysis of textile products composed of certain binary and ternary textile fibre mixtures
• Ref Project: SIST EN ISO 1833-6:2019 - 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) (ISO 1833-6:2018)

• Replaces: EN ISO 1833-6:2010 - Textiles - Quantitative chemical analysis - Part 6: Mixtures of viscose or certain types of cupro or modal or lyocell and cotton fibres (method using formic acid and zinc chloride) (ISO 1833-6:2007)
• Effective Date: 03-Apr-2019
• Refers: ISO 1833-1:2006 - Textiles — Quantitative chemical analysis — Part 1: General principles of testing
• Effective Date: 25-Aug-2026
• Consolidated By: 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)
• Effective Date: 12-Feb-2026

Overview

EN ISO 1833-6:2019 (ISO 1833-6:2018) defines a quantitative chemical method for determining the mass percentage of viscose, certain types of cupro, modal or lyocell in textile mixtures after removal of non‑fibrous matter. The test uses a formic acid / zinc chloride reagent to dissolve the cellulosic-type fibres and is primarily intended for mixtures of those regenerated cellulosic fibres with cotton, but is also applicable to mixtures containing polypropylene, elastolefin and melamine.

Key topics and technical requirements

• Scope & limits
  • Applicable to mixtures of viscose, certain cupro, modal or lyocell with cotton; also usable with polypropylene, elastolefin and melamine.
  • Not applicable where cotton has suffered extensive chemical degradation or where viscose/cupro/modal/lyocell is rendered incompletely soluble by permanent finishes or reactive dyes.
  • Preliminary solubility test required if cupro, modal or lyocell is present.
• Reagent composition
  • Formic acid / zinc chloride reagent: 20 g anhydrous ZnCl2 + 68 g anhydrous formic acid, made up to 100 g with water. If non‑fused zinc chloride is used, fibre solubility must be checked.
  • Dilute ammonia solution: 20 ml concentrated ammonia diluted to 1 L.
• Test conditions
  • Specimen in preheated conical flask (min. 200 ml) at 70 ± 2 °C.
  • Add 100 ml reagent per gram of specimen (preheated to 70 °C), stoppered and shaken; hold at 70 °C for 20 min with shaking at ~5 and ~15 min.
  • Filter, wash at 70 °C, then immerse residue in cold ammonia solution (~10 min) to neutralize, rinse, dry and weigh.
• Calculations & precision
  • Results calculated following ISO 1833‑1 general instructions.
  • Density (d) factors: d = 1.00 generally; cotton = 1.03, melamine = 1.01.
  • Precision: confidence limits not greater than ±2 percentage points at 95% confidence.

Applications and users

• Quality control and composition verification in textile manufacturing and finishing.
• Laboratory testing for fibre content declarations, regulatory compliance and product labelling.
• Textile research, forensic fibre analysis and certification bodies needing a standardized quantitative method.
• Useful to fiber analysts, testing laboratories, garment manufacturers and procurement teams verifying blends containing viscose/modal/lyocell and cotton or synthetic partners.

Related standards

• ISO 1833-1 - Textiles - Quantitative chemical analysis - Part 1: General principles of testing (normative reference for procedure, calculations and general requirements).

Keywords: EN ISO 1833-6:2019, ISO 1833-6, textile analysis, quantitative chemical analysis, viscose, cupro, modal, lyocell, formic acid, zinc chloride, fibre composition, cotton testing.

SLOVENSKI STANDARD
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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) (ISO 1833-6:2018)
Textilien - Quantitative chemische Analysen - Teil 6: Mischungen aus Viskose oder
bestimmten Cupro-, Modal- oder Lyocellfasern und Baumwollfasern (Ameisensäure
-/Zinkchlorid-Verfahren) (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) (ISO 1833-6:2018)
Ta slovenski standard je istoveten z: EN ISO 1833-6:2019
ICS:
59.060.01 Tekstilna vlakna na splošno Textile fibres in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 1833-6
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2019
EUROPÄISCHE NORM
ICS 59.060.01 Supersedes EN ISO 1833-6:2010
English Version
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) (ISO 1833-6:2018)
Textiles - Analyse chimique quantitative - Partie 6: Textilien - Quantitative chemische Analysen - Teil 6:
Mélanges de viscose, certains types de cupro, modal ou Mischungen aus Viskose oder bestimmten Cupro-,
lyocell avec certaines autres fibres (méthode à l'acide Modal- oder Lyocellfasern und Baumwollfasern
formique et au chlorure de zinc) (ISO 1833-6:2018) (Ameisensäure-/Zinkchlorid-Verfahren) (ISO 1833-
6:2018)
This European Standard was approved by CEN on 22 October 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 1833-6:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 1833-6:2019) has been prepared by Technical Committee ISO/TC 38 "Textiles"
in collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of
which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2019, and conflicting national standards
shall be withdrawn at the latest by September 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 1833-6:2010.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 1833-6:2018 has been approved by CEN as EN ISO 1833-6:2019 without any
modification.
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 1833-6:2018(E)
©
ISO 2018
ISO 1833-6:2018(E)
© ISO 2018
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ii © ISO 2018 – All rights reserved

ISO 1833-6:2018(E)
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 .
...