prEN ISO 1833-1

SLOVENSKI STANDARD
01-december-2025
Tekstilije - Kvantitativna kemijska analiza - 1. del: Splošna načela preskušanja
(ISO/DIS 1833-1:2025)
Textiles - Quantitative chemical analysis - Part 1: General principles of testing (ISO/DIS
1833-1:2025)
Textilien - Quantitative chemische Analysen - Teil 1: Allgemeine Grundlagen der Prüfung
(ISO/DIS 1833-1:2025)
Textiles - Analyse chimique quantitative - Partie 1: Principes généraux pour effectuer les
essais (ISO/DIS 1833-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 1833-1
ICS:
59.080.01 Tekstilije na splošno Textiles in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 1833-1
ISO/TC 38
Textiles — Quantitative chemical
Secretariat: JISC
analysis —
Voting begins on:
Part 1: 2025-09-16
General principles of testing
Voting terminates on:
2025-12-09
Textiles — Analyse chimique quantitative —
Partie 1: Principes généraux des essais
ICS: 59.060.01
THIS DOCUMENT IS A DRAFT CIRCULATED
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Reference number
ISO/DIS 1833-1:2025(en)
DRAFT
ISO/DIS 1833-1:2025(en)
International
Standard
ISO/DIS 1833-1
ISO/TC 38
Textiles — Quantitative chemical
Secretariat: JISC
analysis —
Voting begins on:
Part 1:
General principles of testing
Voting terminates on:
Textiles — Analyse chimique quantitative —
Partie 1: Principes généraux des essais
ICS: 59.060.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 1833-1:2025(en)
ii
ISO/DIS 1833-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Conditioning and testing atmosphere. 2
8 Sampling and pre-treatment of laboratory test sample . 2
8.1 Sampling .2
8.2 Pre-treatment of laboratory test sample .2
9 Procedure . 3
9.1 General instructions .3
9.1.1 Handling .3
9.1.2 Drying .3
9.1.3 Drying of test specimens.3
9.1.4 Drying of crucible and residue .3
9.1.5 Cooling .3
9.1.6 Weighing .3
9.2 Testing execution .3
10 Calculation and Expression of results . 4
11 Precision of the methods . 5
12 Test report . 5
Annex A (normative) Methods for the removal of non-fibrous matter . 6
Annex B (normative) Method of quantitative analysis by manual separation .15
Annex C (normative) General calculation of the mass percentage of each component .18
Annex D (informative) Examples of ternary component fibre mixtures .22
Annex E (informative) Examples of four component fibre mixtures .26
Annex F (informative) Examples of five component fibre mixtures .32
Annex G (informative) Examples of six component fibre mixtures .35
Bibliography .38

iii
ISO/DIS 1833-1:2025(en)
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, in collaboration with the European
Committee for Standardization (CEN] Technical Committee CEN/TC 248, Textiles and textile products, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 1833-1:2020), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Annex C for general calculation of the mass percentage of each component has been added.
— Annex D, Annex E, Annex F and Annex G have been added for examples of ternary fibre mixtures, four
component fibre mixtures, five component fibre mixtures, and six component fibre mixtures, respectively.
A list of all parts in the ISO 1833 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 1833-1:2025(en)
Introduction
Methods for the quantitative analysis of fibre mixtures are based on two main processes, the manual
separation and the chemical separation of fibres.
It is preferable to use the method of manual separation, which is given in Annex B, whenever possible since
it generally gives more accurate results than the chemical method. It can be used for all textiles whose
component fibres do not form an intimate mixture, for example in the case of yarns composed of several
elements each of which is made up of only one type of fibre, or woven fabrics in which the fibre of the warp
is of a different kind to that of the weft, or knitted fabrics capable of being unravelled made up of yarns of
different types.
In general, the methods described in the different parts of ISO 1833 are based on the selective dissolution
of an individual component. After the removal of a component, the insoluble residue is weighed, and the
proportion of soluble component is calculated from the loss in mass. This document gives the information
which is common to the analyses, by this method, of all fibre mixtures, whatever their composition. This
information is intended to be used in conjunction with the other parts of ISO 1833; these parts contain the
detailed procedures applicable to particular fibre mixtures. Where, occasionally, an analysis is based on a
principle other than selective dissolution, full details are given in the appropriate part.
Mixtures of fibres obtained during processing and, to a lesser extent, in finished textiles can contain non-
fibrous matter, such as fats, waxes or dressings, or water-soluble matter, either occurring naturally or added
to facilitate processing. Non-fibrous matters are removed before analysis.
A method of pre-treatment for removing oils, fats, waxes and water-soluble matter is given in Annex A.
Dye in dyed fibres is considered to be an integral part of the fibre and is not removed.
In addition, textiles can contain resins or other matter added to bond the fibres together or to confer special
properties, such as water-repellence or crease-resistance. Such matter, including dyestuffs in exceptional
cases, can interfere with the action of the reagent on the soluble component and/or it can be partially or
completely removed by the reagent. This type of added matter can also cause errors and are removed before
the sample is analysed. If it is impossible to remove such added matter, the methods of analysis are no longer
applicable.
Most textile fibres contain water, the amount depending on the type of fibre and on the relative humidity of
the surrounding air. Analyses are conducted on the basis of dry mass, and a procedure for determining the
dry mass of test specimens and residues is given in this document.
The result is therefore obtained on the basis of clean, dry fibres.
Provision is made for recalculating the result on the basis of
a) agreed moisture regain
NOTE The agreed moisture regain of each fibre is specified in some regional legislation or after agreement
between interested parties.
b) agreed moisture regain and also for
1) fibrous matter removed in the pre-treatment, and
2) non-fibrous matter (for example, fibre dressing, processing oil, or size) that can be properly
regarded as part of the fibre as an article of commerce.
In some methods, the insoluble component of a mixture can be partially dissolved in the reagent used to
dissolve the soluble component. Where possible, the reagents that have been chosen are those that have
little or no effect on the insoluble fibres. If loss in mass is known to occur during the analysis, the result is
corrected; correction factors for this purpose are given. These correction factors have been determined in
several laboratories by treating, in the appropriate reagent as specified in the method of analysis, fibres
cleaned by the pre-treatment.
v
ISO/DIS 1833-1:2025(en)
These correction factors apply only to undegraded fibres, and different correction factors might be necessary
if the fibres have been degraded during processing.
The procedures given apply to single determinations; at least two determinations on separate test specimens
are made, both in the case of manual separation and in the case of chemical separation, but more may be
carried out if desired.
Before proceeding with any quantitative analysis, it is assumed that all the fibres present in the mixture
have been identified. For this purpose, ISO/TR 11827 may be used.
For confirmation, unless it is technically impossible, it is recommended that use be made of alternative
procedures whereby the component that would be the residue in the standard method is dissolved out first.

vi
DRAFT International Standard ISO/DIS 1833-1:2025(en)
Textiles — Quantitative chemical analysis —
Part 1:
General principles of testing
1 Scope
This document specifies a common method for the quantitative chemical analysis of various mixtures of
fibres. This method and the methods described in the other parts of ISO 1833 are applicable, in general,
to fibres in any textile form. Where certain textile forms are excepted, these are listed in the scope of the
appropriate part.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 105-C10, Textiles — Tests for colour fastness — Part C10: Colour fastness to washing with soap or soap and soda
ISO 2076, Textiles- Man-made fibres-Generic names
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 5089, Textiles — Preparation of laboratory test samples and test specimens for chemical testing
ISO 6938, Textiles — Natural fibres — Generic names and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5089 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
non-fibrous matter
processing aids such as lubricants and sizes or naturally occurring non-fibrous substances
4 Principle
After the identification of the components of a mixture, the non-fibrous matter is removed by suitable
pre-treatment and then one of the components is determined usually by selective dissolution or manual
separation (see Annex B). The insoluble residue is dried and weighed, and the proportion of soluble
component calculated from the loss in mass. It is usually preferable to dissolve the fibre present in the
greater proportion, thus obtaining the fibre present in the smaller proportion as residue.
The fibre names in the ISO 1833 series are in accordance with the generic names listed in ISO 6938 for the
natural fibres and ISO 2076 for the man-made fibres.

ISO/DIS 1833-1:2025(en)
5 Reagents
Use only reagents of analytical grade. Reagents are listed in Table A.1.
WARNING — The ISO 1833 series may call for the use of substances/procedures that may be injurious
to the health/environment if appropriate conditions are not observed. It refers only to technical
suitability and does not absolve the user from legal obligations relating to health and safety/
environment at any stage.
5.1 Water, grade 3 (according to ISO 3696).
6 Apparatus
6.1 Glass filter crucible, capacity 30 ml to 40 ml, with sealed-in sintered disk filter with pore size of 90
µm to 150 µm.
In place of a glass filter crucible, any other apparatus giving identical results may be used.
6.2 Stoppered weighing bottles, large enough to contain such crucibles.
6.3 Vacuum flask.
6.4 Desiccator, containing self-indicating silica gel.
6.5 Ventilated oven, for drying test specimens at (105 ± 3) °C.
6.6 Analytical balance, with a resolution of 0,000 2 g or better.
6.7 Soxhlet extraction apparatus, or any other apparatus giving identical results.
NOTE Soxhlet size of a volume, in millilitres, equal to 20 times the mass, in grams, of the laboratory test sample
has been found convenient.
7 Conditioning and testing atmosphere
Because dry masses are determined, it is unnecessary to condition the test specimen. The analysis is carried
out under ordinary room conditions.
8 Sampling and pre-treatment of laboratory test sample
8.1 Sampling
Take a laboratory test sample, as described in ISO 5089, that is representative of the laboratory bulk sample
and sufficient to provide all the test specimens, each of at least 1 g, that are required. Fabrics may contain
yarns of different composition and account should be taken of this fact in the sampling of the fabric. Treat
the laboratory test sample as described in 8.2.
8.2 Pre-treatment of laboratory test sample
Laboratory test sample shall be pretreated by a suitable method (as described in Annex A) which does not
affect any of the fibre components.
NOTE 1 The purpose of the pre-treatment is to remove non-fibrous matter, which is not to be taken into account in
the percentage calculations.
ISO/DIS 1833-1:2025(en)
If the pre-treatment is not applied, it shall be reported with the reasons of this deviation of the given
procedure.
NOTE 2 The non-application of certain pre-treatments is known to have a negligible effect on the results.
9 Procedure
9.1 General instructions
9.1.1 Handling
Avoid handling crucibles and weighing bottles, test specimens or residues with bare hands during the
drying, cooling and weighing operations.
9.1.2 Drying
Conduct all drying operations for not less than 4 h and not more than 16 h at (105 ± 3) °C in a ventilated oven
with the oven door closed throughout.
If the drying period is less than 14 h, the test specimen or the residue shall be weighed to check that its mass
has become constant.
The mass may be considered to have become constant if, after a further drying period of 60 min, its variation
is less than 0,05 %.
9.1.3 Drying of test specimens
Dry the test specimen in a weighing bottle with its stopper beside it. After drying, close the weighing bottle
with its stopper before removing it from the oven, and transfer it quickly to a desiccator.
9.1.4 Drying of crucible and residue
Dry the filter crucible with the residue in a weighing bottle with its stopper beside it in the oven. After
drying, close the weighing bottle with its stopper before removing it from the oven and transfer it quickly to
the desiccator.
Where apparatus other than a filter crucible is used, drying operations in the oven shall be conducted in
such a way as to enable the dry mass of the fibres to be determined without loss.
9.1.5 Cooling
Conduct all cooling operations in the desiccator, the latter placed beside the balance, until complete cooling
of the weighing bottles is attained, and in any case for not less than 2 h.
9.1.6 Weighing
After cooling, complete the weighing of the test specimen in a weighing bottle or crucible with the residue in
a weighing bottle within 2 min of its removal from the desiccator.
Weigh to the nearest 0,000 2 g.
9.2 Testing execution
From the pre-treated laboratory test sample, take a test specimen weighing about 1 g. Cut the yarn or
dissected fabric into lengths of about 10 mm. Dry the test specimen in a weighing bottle, cool it in the
desiccator and weigh it (see 9.1).

ISO/DIS 1833-1:2025(en)
Transfer the test specimen to the glass vessel specified in the appropriate part of ISO 1833, reweigh the
weighing bottle with its stopper immediately, and obtain the dry mass of the test specimen by the difference.
Complete the test procedure as specified in the appropriate part of ISO 1833 and examine the residue
microscopically (or otherwise, as appropriate) to check that the treatment has in fact completely removed
the soluble fibre.
The analysis of at least two test specimens shall be made.
10 Calculation and Expression of results
10.1 General
Express the mass of the insoluble component as a percentage of the total mass of fibre in the mixture. The
percentage of soluble component is obtained by difference.
Calculate the results on the basis of clean dry mass using Formula (1), adjusted by the agreed moisture
regain and the correction factors necessary to take account of loss of matter during pre-treatment and
analysis by using Formula (2).
NOTE The agreed moisture regain of each fibre is specified in some regional legislation or after agreement
between interested parties.
10.2 Calculation of mass percentage of insoluble component on clean dry mass basis.
100××md
P= (1)
m
where
P is the mass percentage of clean dry insoluble component;
m is the dry mass of the test specimen, expressed in g;
m is the dry mass of the residue, expressed in g;
d is the correction factor of variation in mass of insoluble component in the reagent.
Suitable values of d are given in the different parts of ISO 1833.
10.3 Calculation of mass percentage of insoluble component on clean, dry mass basis (see 10.2), with
percentage additions for moisture and non-fibrous matter, and/or percentage losses of fibrous matter by
pre-treatment.
100××Pa10+×,01 ()+b
[]
P = (2)
1A
Pa×+[]10,,01×+()bP+−()100 ×+[]10 011×+()ab
22 11
where
P is the mass percentage of clean insoluble component with percentage additions for moisture
1A
and non-fibrous matter;
P is the mass percentage of clean dry insoluble component [as calculated in Formula (1)];
a is the mass percentage addition to the soluble component for moisture;
a is the mass percentage addition to the insoluble component for moisture;
b is the mass percentage variation of soluble fibrous matter caused by the pre-treatment, and/or
the percentage addition to the soluble component for non-fibrous matter;
b is the mass percentage variation of insoluble fibrous matter caused by the pre-treatment, and/
or the percentage addition to the insoluble component for non-fibrous matter.

ISO/DIS 1833-1:2025(en)
Calculate the mass percentage of the second component using the Formula (3).
PP=−100 (3)
21AA
If the calculated value of P is greater than 100 % (leading to a negative percentage of P ), the correction
1A 2A
factor d used in Formula (1) should be reconsidered due to a potential over estimation. The change of the
correction factor d shall be reported. If technically possible, the mass percentage of the components shall be
confirmed based on an alternative method (e.g. chemical analysis using another solvent, manual separation,
microscopical analysis).
Where a special pre-treatment has been used, the values of b and b should be determined, if possible, by
1 2
submitting each of the pure fibre components to pre-treatment applied in the analysis. Pure fibres are those
free from all non-fibrous matter except that which they normally contain (either naturally or because of the
manufacturing process), in the state (unbleached, bleached) in which they are found in the material to be
analysed.
Where no pre-treated separate fibre components used in the manufacture of the material to be analysed are
available, average values of b and b as obtained from tests performed on clean fibres similar to those in the
1 2
mixture under examination, could be used.
Annex C gives general calculation of the mass percentage of each component. Annex D, Annex E, Annex F
and Annex G give examples of ternary fibre mixtures, four component fibre mixtures, five component fibre
mixtures, and six component fibre mixtures, respectively.
11 Precision of the methods
The precision indicated in individual parts of ISO 1833 relates to the reproducibility. The reproducibility
refers to the reliability, i.e. the closeness of agreement between experimental values obtained by operators
in different laboratories or at different times, using the same method on test specimens of an identical,
consistent mixture.
The reproducibility is expressed by confidence limits of the results for a confidence level of 95 %, i.e. the
difference between two results in a series of analyses made in different laboratories would be exceeded only
in five cases out of 100, when the standard method is applied to an identical consistent mixture.
12 Test report
The test report of any part shall specify the following:
a) a reference to the relevant part of ISO 1833;
b) whether the result relates to the overall composition of the material or to an individual component of
the assembly;
c) identification (e.g. description) of the laboratory test sample;
d) qualitative fibre identification of the test specimens;
e) method(s)of pre-treatment used;
f) details of any special treatment for the removal of size or finish given in addition to the specified pre-
treatment;
g) the individual results and the arithmetic mean, each to the nearest 0,1 %;
h) any deviation from the given procedure, especially if pre-treatment is not applied (see 8.2);
i) any unusual features observed;
j) the date of the test.
ISO/DIS 1833-1:2025(en)
Annex A
(normative)
Methods for the removal of non-fibrous matter
A.1 General
The removal of certain types of non-fibrous matter, particularly when more than one substance is present,
may demand the exercise of considerable chemical resource, and each material to be treated for removal of
its non-fibrous matter should be regarded as an individual problem. The procedures described in this annex
do not pretend to be complete, and it should not be assumed that those described in this annex will have
no effect on the physical and chemical properties of the textile materials concerned. Furthermore, these
procedures are only applicable where the non-fibrous matter is known or can be identified with certainty.
For the purposes of this annex, dyes are not considered as non-fibrous matter but as an integral part of the
textile, and are not, therefore, mentioned. Some prints are made with resin bonded pigments which cannot
be regarded as part of the fibre substance. They involve a greater addition of mass to the fibre than dyes
and it would be desirable to remove them, but it is rarely if ever possible to do so. Similarly, certain finishes
cannot be removed. In the present state of knowledge, quantitative analysis cannot, therefore, be carried out
with the degree of accuracy provided for by the test methods described in the different parts of ISO 1833.
It may be assumed that Soxhlet extraction under the conditions described in this annex can ensure adequate
removal of oils, fat and waxes. With other non-fibrous matter, it is necessary, wherever possible, to check
that removal is complete.
CAUTION — Since certain hazards are associated with reagents and solvents employed in the
methods given below, these methods should be used only by persons acquainted with the hazards
and the precautions to be taken.
A.2 Overview
This annex describes procedures for the removal of certain commonly found types of non-fibrous matter
from fibres. Fibres to which the procedures are applicable and those to which they are not applicable are
listed in Table A.1, in relation to the non-fibrous matter to be removed. The names of these fibres shall be in
accordance with ISO 2076 or ISO 6938. Identification of the fibres present is covered by ISO/TR 11827.
In certain cases, the elimination of all the added matter is impracticable. The quantity remaining should not
affect the quantitative analysis. On the other hand, it is essential to minimize the chemical degradation of
the fibres.
A.3 Principle
Where possible, remove non-fibrous matter by a suitable solvent.
NOTE In many cases, the removal of certain finishes involves their chemical modification. In addition, chemical
degradation of the fibre substance cannot always be avoided.
A.4 Apparatus and reagents
A.4.1 Apparatus
The apparatus required is part of the equipment of a chemical laboratory.

ISO/DIS 1833-1:2025(en)
A.4.2 Reagents
A.4.2.1 Light petroleum, CAS Registry Number®1 (CAS RN®) 8032-32-4.
A.4.2.2 Soap, CAS Registry Number® (CAS RN®) 822-16-2.
A.4.2.3 Acetone, CAS Registry Number® (CAS RN®) 67-64-1.
A.4.2.4 Sodium hydroxide, CAS Registry Number® (CAS RN®) 1310-73-2.
A.4.2.5 Toluene, CAS Registry Number® (CAS RN®) 108-88-3.
A.4.2.6 Methanol, CAS Registry Number® (CAS RN®) 67-56-1.
A.4.2.7 Amylase, CAS Registry Number® (CAS RN®) 9000-90-2.
A.4.2.8 Sodium carbonate, CAS Registry Number® (CAS RN®) 497-19-8.
A.4.2.9 Orthophosphoric Acid, CAS Registry Number® (CAS RN®) 7664-38-2.
A.4.2.10 Urea, CAS Registry Number® (CAS RN®) 57-13-6.
A.4.2.11 Sodium hydrogen carbonate, CAS Registry Number® (CAS RN®) 144-55-8.
A.4.2.12 Dichloromethane, CAS Registry Number® (CAS RN®) 75-09-2.
A.4.2.13 Acetic acid, CAS Registry Number® (CAS RN®) 64-19-7.
A.4.2.14 Tetrahydrofuran, CAS Registry Number® (CAS RN®) 109-99-9.
A.4.2.15 Hydrochloric acid, CAS Registry Number® (CAS RN®) 7647-01-0.
A.4.2.16 Hydrated oxalic acid, CAS Registry Number® (CAS RN®) 6153-56-6.
A.4.2.17 Ammonium hydroxide, CAS Registry Number® (CAS RN®) 1336-21-6.
A.4.2.18 Dimethyl sulfoxide, CAS Registry Number® (CAS RN®) 67-68-5.
A.4.2.19 Ethanol, CAS Registry Number® (CAS RN®) 64-19-7.
A.4.2.20 Benzene, CAS Registry Number® (CAS RN®) 71-43-2.
A.4.2.21 p-dichlorobenzene, CAS Registry Number® (CAS RN®) 106-46-7.
A.4.2.22 tert-butyl hydroperoxide, CAS Registry Number® (CAS RN®) 75-91-2.
A.4.2.23 Hydrofluoric acid, CAS Registry Number® (CAS RN®) 7664-39-3.
A.4.2.24 Formic acid, CAS Registry Number® (CAS RN®) 64-18-6.
A.4.2.25 Acid stable surfactant, CAS Registry Number® (CAS RN®) 9002-92-0.

ISO/DIS 1833-1:2025(en)
A.4.2.26 Potassium iodide, CAS Registry Number® (CAS RN®) 7681-11-0.
Table A.1 — Use of procedures for removal of non-fibrous matter
Fibres in the Method
Fibres in the presence
Non-fibrous matter presence of which
of which the procedure
to be removed the procedure is
Subclause Reagents/Apparatus
is not applicable
applicable
Elastane, elastolefin,
Light petroleum, Man-made cellulose
Most fibres A.5.1.1
Soxhlet fibres dyed with
reactive dyes and cotton
Elastane A.5.1.2 Soap and water 一
Oils, fats and waxes
Acetate, modacrylic,
Elastolefin A.5.1.3 Acetone, Soxhlet
chlorofibre
Man-made cellulose
A.5.1.1 followed by
fibres dyed with
A.5.1.4 sodium hydroxide
一
reactive dyes and
solution
cotton
Toluene /methanol,
Soaking oils Nett silk A.5.2 一
Soxhlet
a b
Cotton , linen ,
Amylase then boiling
viscose, spun silk,
Starch A.5.3 -
c
jute and most other Water
fibres
a
Cotton , viscose, Boiling water
Locust-bean gum and
A.5.4 一
starch
spun silk followed by A.5.3
Tamarind seed
a
Cotton , viscose A.5.5 Boiling water twice 一
size
Protein, deacetylated
2 g/l soap, 2 g/l sodium
acetate, acetate,
hydroxide,
Acrylic (size or
d
Most fibres A.5.6
finish) triacetate, acrylic,
70 °C to 75 °C, rinse in
water
modacrylic
1 g/l non-ionic surfactant, Protein, deacetylated
Gelatine and polyvi-
1 g/l anionic surfactant, acetate, acetate,
Most fibres A.5.7
nyl alcohol
1 g/l sodium carbonate triacetate
Protein, deacetylated
Starch and polyvinyl
acetate, acetate,
Cotton, polyester A.5.8 A.5.3 followed by A.5.7
alcohol
triacetate
Deacetylated acetate,
Polyvinyl acetate Most fibres A.5.9 Acetone, Soxhlet acetate triacetate,
chlorofibre
A.5.1 followed by Protein, deacetylated ac-
Linseed oil sizes Viscose crêpe yarns A.5.10
A.5.7 etate, acetate, triacetate
a
Grey cotton loses mass when treated by this method. The loss amounts to approximately 3 % of the final oven-dry mass.
b
Linen loses mass when treated by this method. The loss depends on the types of the yarn from which the fabric is produced.
Losses are approximately as follows: bleached yarns 2 %, boiled yarns 3 % and grey yarns 4 %.
c
Jute loses mass by approximately 0,5 % when treated by this method.
d
Polyamide 6,6 can undergo a loss in mass of fibre substance of up to 1 % when treated by this method. The loss in mass of
polyamide 6 can vary between 1 % and 3 %.

ISO/DIS 1833-1:2025(en)
TTabablele A A.11 ((ccoonnttiinnueuedd))
Fibres in the Method
Fibres in the presence
Non-fibrous matter presence of which
of which the procedure
to be removed the procedure is
Subclause Reagents/Apparatus
is not applicable
applicable
Cotton, cupro, Orthophosphoric
viscose, modal, Acid/urea,80 °C,
Amino-formaldehyde
A.5.11 Asbestos
deacetylated acetate, 10 min, rinse in water, then
resins
acetate, triacetate, sodium
polyester, polyamide hydrogen carbonate
Deacetylated acetate,
Dichloromethane (methyl-
Bitumen, creosote
ene chloride),
Most fibres A.5.12 acetate, triacetate,
and tar
Soxhlet
modacrylic, chlorofibre
Most fibres A.5.13.1 Soak in cold water 一
Viscose, deacetylated
175 g/l sodium hydroxide
Cellulose ethers
Cotton A.5.13.2 solution at 10 °C, neutral- acetate, triacetate,
ized in 0,1 mol/l acetic acid
modacrylic, acrylic
Deacetylated acetate,
Cellulose nitrate Most fibres A.5.14 Soaking in acetone, 1 h
acetate, triacetate
Deacetylated acetate,
Soaking in tetrahydrofuran
Polyvinyl chloride Most fibres A.5.15 (do not recover by distilla- acetate, triacetate,
tion)
chlorofibre
Deacetylated acetate,
0,2 mol/l hydrochloric acid,
acetate, triacetate,
Oleates Most fibres A.5.16 extraction in dichlorometh-
modacrylic, chlorofibre,
ane, Soxhlet
polyamide, asbestos
Cupro, viscose,
14 g/l hydrated oxalic acid
modal, deacetylated
Oxides of chromium,
A.5.17 at 80 °C, neutralize with
一
iron and copper
acetate, acetate,
ammonium hydroxide
triacetate
Polyethylene,
Pentachlorophenyl
Most fibres A.5.18 Toluene, Soxhlet
laurate
polypropylene
Boiling toluene under
Polyethylenes Most fibres A.5.19 Polypropylene
reflux
Dimethyl sulfoxide or Deacetylated acetate,
Polyamide, cupro,
acetate, triacetate, poly-
viscose, modal,
dichloromethane, if possi-
Polyurethanes A.5.20
ester, acrylic,
deacetylated acetate,
ble 50 g/l sodium hydrox-
acetate, triacetate
ide, ethanol at 50 °C modacrylic
Swell in benzene,
Cupro, viscose,
Natural rubber and
scrape, heat in molten
styrene-butadiene, modal, deacetylated
p-dichlorobenzene, tert-bu-
A.5.21 All synthetic fibres
polychloroprene, acetate, acetate,
tyl hydroperoxide per 4
nitrile
parts of p-dichlorobenzene,
triacetate, glass
cool to 60 °C, add benzene
Hydrofluoric acid, 50 ml to
Silicones Most fibres A.5.22 Polyamide, glass
60 ml per litre, 65 °C
Tin weighting Silk A.5.23 0,5 mol/I hydrofluoric acid 一
a
Grey cotton loses mass when treated by this method. The loss amounts to approximately 3 % of the final oven-dry mass.
b
Linen loses mass when treated by this method. The loss depends on the types of the yarn from which the fabric is produced.
Losses are approximately as follows: bleached yarns 2 %, boiled yarns 3 % and grey yarns 4 %.
c
Jute loses mass by approximately 0,5 % when treated by this method.
d
Polyamide 6,6 can undergo a loss in mass of fibre substance of up to 1 % when treated by this method. The loss in mass of
polyamide 6 can vary between 1 % and 3 %.

ISO/DIS 1833-1:2025(en)
TTabablele A A.11 ((ccoonnttiinnueuedd))
Fibres in the Method
Fibres in the presence
Non-fibrous matter presence of which
of which the procedure
to be removed the procedure is
Subclause Reagents/Apparatus
is not applicable
applicable
Dichloromethane,
Deacetylated acetate,
Soxhlet, if metallic com-
Wax-based water- Cotton, protein, poly-
A.5.24 acetate, triacetate,
plex:10 g/l formic acid
proof finishes ester, polyamide
and 5 g/l acid stable sur-
modacrylic, chlorofibre
factant
Non-cellulosic
components (such as
Bast fibres (e.g. Flax) A.5.25 Sodium hydroxide solution 一
pectin, hemicellulose,
ligninetc)
a
Grey cotton loses mass when treated by this method. The loss amounts to approximately 3 % of the final oven-dry mass.
b
Linen loses mass when treated by this method. The loss depends on the types of the yarn from which the fabric is produced.
Losses are approximately as follows: bleached yarns 2 %, boiled yarns 3 % and grey yarns 4 %.
c
Jute loses mass by approximately 0,5 % when treated by this method.
d
Polyamide 6,6 can undergo a loss in mass of fibre substance of up to 1 % when treated by this method. The loss in mass of
polyamide 6 can vary between 1 % and 3 %.
A.5 Procedures
A.5.1 Oils, fats and waxes
A.5.1.1 Oils, fats and waxes using light petroleum (A.4.2.1)
Extract the test specimen in a Soxhlet apparatus or similar apparatus with light petroleum (distilling
between 40 °C and 60 °C) for at least 1 h at a minimum rate of six cycles per hour.
For some unbleached, natural vegetable fibres (for example, jute, coir), pre-treatment with light petroleum
and water does not remove all the natural non-fibrous matter. Nevertheless, additional pre-treatment is not
applied unless the sample contains finishes which are insoluble in both light petroleum and water.
A.5.1.2 Oils, fats and waxes using soap (A.4.2.2) and water
For test specimen containing elastane, pre-treatment with light petroleum and water is not applicable as it
affects the elastane itself.
NOTE Usually the masses of oils, fats and waxes on elastane fibres are negligible when elastane is present in low
mass percentage.
Immerse and agitate the test specimen in water containing 1 g/l of soap, as described in ISO 105-C10, during
1 h at 60 °C, then rinse with warm water (approximately at 40 °C).
A.5.1.3 Oils, fats and waxes using acetone (A.4.2.3)
In the case of elastolefin or fibre mixtures containing elastolefin and other fibres (except acetate), the
procedure described in A.5.1.1 shall be slightly modified in that light petroleum ether shall be replaced by
acetone.
A.5.1.4 Oils, fats and waxes using light petroleum (A.4.2.1) and then sodium hydroxide solution
(A.4.2.4)
In the case of dyeing
...