EN ISO 1833-18:2020

Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk with wool or other animal hair (method using sulfuric acid) (ISO 1833-18:2020)

This document specifies a method, using sulfuric acid, to determine the mass percentage of silk, after removal of non-fibrous matter, in textiles made of mixtures of
—          silk
with
—     wool or other animal hair.

Textilien - Quantitative chemische Analysen - Teil 18: Mischungen aus Seide mit Wolle oder anderen Tierhaaren (Verfahren mit Schwefelsäure) (ISO 1833 18:2020)

Dieses Dokument legt ein Schwefelsäure Verfahren fest zur Bestimmung des prozentualen Massenanteils an Seide, nach dem Abtrennen der nichtfaserigen Begleitstoffe, in Textilien aus Mischungen aus
- Seide
mit
- Wolle oder anderen Tierhaaren.

Textiles - Analyse chimique quantitative - Partie 18: Mélanges de soie avec de la laine ou d'autres poils animaux (méthode à l'acide sulfurique) (ISO 1833-18:2020)

Le présent document spécifie une méthode de détermination, à l'acide sulfurique, de la masse exprimée en pourcentage de soie, après élimination des matières non fibreuses, dans les textiles composés de mélanges de :
—          soie ;
avec
—          laine ou autres poils animaux.

Tekstilije - Kvantitativna kemična analiza - 18. del: Mešanica svile z volno ali drugimi živalskimi vlakni (metoda z uporabo žveplene kisline) (ISO 1833-18:2020)

General Information

• Status: Published
• Publication Date: 20-Oct-2020
• Withdrawal Date: 29-Apr-2021
• ICS: 59.060.01 - Textile fibres in general
• Technical Committee: CEN/TC 248 - Textiles and textile products
• Drafting Committee: CEN/TC 248/WG 30 - Quantitative analysis of fibre mixtures
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 21-Oct-2020
• Completion Date: 21-Oct-2020
• 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 1833-18:2020 - Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk with wool or other animal hair (method using sulfuric acid) (ISO 1833-18:2020)

Relations

• Replaces: EN ISO 1833-18:2019 - Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk with other protein fibres (method using sulfuric acid) (ISO 1833-18:2019)
• Effective Date: 12-Feb-2020
• Refers: ISO 1833-1:2020 - Textiles — Quantitative chemical analysis — Part 1: General principles of testing
• Effective Date: 09-Feb-2026
• Consolidated By: ISO 1833-18:2020 - Textiles — Quantitative chemical analysis — Part 18: Mixtures of silk with wool or other animal hair (method using sulfuric acid)
• Effective Date: 12-Feb-2026

Overview

EN ISO 1833-18:2020 is an internationally recognized standard developed by CEN (European Committee for Standardization) and ISO. Its focus is the quantitative chemical analysis of textiles, specifically for determining the percentage composition of silk in blends with wool or other animal hair, using a sulfuric acid method. This standard enables accurate, repeatable results for manufacturers, laboratories, and quality assurance professionals working with natural fibre textile blends. The standard supports transparency in textile supply chains, ensures quality, and aids compliance with international regulations.

Key Topics

• Chemical Analysis of Textile Fibres: The standard details procedures to chemically separate and quantify silk content in textile mixtures containing animal fibres, such as wool or other animal hair.
• Sulfuric Acid Method: It prescribes the use of 75% sulfuric acid to selectively dissolve the silk component, leaving wool or animal hair as residue. This residue is then analyzed to determine the blend’s composition.
• Precision and Reliability: The standard specifies that the confidence limits of results obtained are not greater than ±1 percentage point at the 95% confidence level, ensuring high reliability in percentage determination.
• Removal of Non-Fibrous Matter: The process requires preliminary removal of non-fibrous substances from the material, ensuring that only the fibre content is analyzed.
• Test Procedure and Calculation: Detailed procedural steps are provided, including sample preparation, correct acid concentration ranges, washing, drying, and accurately calculating the silk content as a percentage of the total dry mass.

Applications

EN ISO 1833-18:2020 has broad application across the textile industry, research, and regulatory sectors:

• Textile Manufacturing: Assists manufacturers in verifying the fibre composition of finished products, ensuring correct labelling and compliance with customer and legal requirements.
• Quality Control Laboratories: Used for routine analysis to confirm blend ratios and to detect adulteration or mislabelling of luxury or specialty fibre products.
• Textile Imports and Exports: Facilitates objective verification of fibre content for international trade and customs declarations.
• Product Development and Research: Provides a scientific basis for developing new blends and understanding the behavior of fibre combinations under chemical treatment.
• Consumer Protection and Transparency: Supports accurate product descriptions, enhancing consumer trust and enabling informed purchasing decisions for textile goods containing silk, wool, or other animal hair.

Related Standards

EN ISO 1833-18:2020 is part of a broader framework of standards pertaining to textile fibre analysis:

• EN ISO 1833-1: Textiles - Quantitative Chemical Analysis - Part 1: General Principles of Testing
  • Lays out the overarching methodology and calculation principles referenced by all parts of the EN ISO 1833 series.
• ISO 1833-4: Textiles - Quantitative Chemical Analysis - Part 4: Mixtures of Certain Protein Fibres with Other Fibres (Hypochlorite Method)
  • Provides alternative chemical analysis methods for other types of fibre mixtures.
• Other Parts of the EN ISO 1833 Series
  • Address chemical analysis for various combinations of textile fibres.

Keywords: EN ISO 1833-18:2020, textile fibre analysis, quantitative chemical analysis, silk blends, wool, animal hair, sulfuric acid method, fibre composition testing, textile standards, CEN, ISO, textile quality control, textile manufacturing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN ISO 1833-18:2019
Tekstilije - Kvantitativna kemična analiza - 18. del: Mešanica svile z volno ali
drugimi živalskimi vlakni (metoda z uporabo žveplene kisline) (ISO 1833-18:2020)
Textiles - Quantitative chemical analysis - Part 18: Mixtures of silk with wool or other
animal hair (method using sulfuric acid) (ISO 1833-18:2020)
Textilien - Quantitative chemische Analysen - Teil 18: Mischungen aus Seide mit Wolle
oder anderen Tierhaaren (Verfahren mit Schwefelsäure) (ISO 1833 18:2020)
Textiles - Analyse chimique quantitative - Partie 18: Mélanges de soie avec de la laine ou
d'autres poils animaux (méthode à l'acide sulfurique) (ISO 1833-18:2020)
Ta slovenski standard je istoveten z: EN ISO 1833-18:2020
ICS:
59.060.10 Naravna vlakna Natural fibres
71.040.40 Kemijska analiza Chemical analysis
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 1833-18
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2020
EUROPÄISCHE NORM
ICS 59.060.01 Supersedes EN ISO 1833-18:2019
English Version
Textiles - Quantitative chemical analysis - Part 18:
Mixtures of silk with wool or other animal hair (method
using sulfuric acid) (ISO 1833-18:2020)
Textiles - Analyse chimique quantitative - Partie 18: Textilien - Quantitative chemische Analysen - Teil 18:
Mélanges de soie avec de la laine ou d'autres poils Mischungen aus Seide mit Wolle oder anderen
animaux (méthode à l'acide sulfurique) (ISO 1833- Tierhaaren (Verfahren mit Schwefelsäure) (ISO 1833
18:2020) 18:2020)
This European Standard was approved by CEN on 19 October 2020.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 1833-18:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 1833-18:2020) 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 April 2021, and conflicting national standards shall be
withdrawn at the latest by April 2021.
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 1833-18:2019.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 1833-18:2020 has been approved by CEN as EN ISO 1833-18:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 1833-18
Third edition
2020-10
Textiles — Quantitative chemical
analysis —
Part 18:
Mixtures of silk with wool or other
animal hair (method using sulfuric
acid)
Textiles — Analyse chimique quantitative —
Partie 18: Mélanges de soie avec de la laine ou d'autres poils animaux
(méthode à l'acide sulfurique)
Reference number
ISO 1833-18:2020(E)
©
ISO 2020
ISO 1833-18:2020(E)
© ISO 2020
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
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CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 1833-18:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Test procedure .
...