Textiles - Quantitative chemical analysis - Part 2: Ternary fibre mixtures (ISO 1833-2:2020)

This document specifies methods of quantitative analysis of various ternary mixtures of fibres.
The field of application of each method for analysing mixtures, specified in the parts of ISO 1833,
indicates the fibres to which the method is applicable.
This document is applicable to mixtures of fibres with more than three components provided that
the combination of test methods leads back to simple cases of fibre mixtures. Table B.1 illustrates the
typical ternary mixtures and their applied corresponding parts of the ISO 1833 series.

Textilien - Quantitative chemische Analysen - Teil 2: Ternäre Fasermischungen (ISO 1833-2:2020)

Dieses Dokument legt Verfahren der quantitativen Analyse verschiedener ternärer Fasermischungen fest.
Der in den verschiedenen Teilen von ISO 1833 festgelegte Anwendungsbereich jedes Verfahrens zur Analyse von Mischungen gibt an, für welche Fasern das Verfahren anzuwenden ist.
Dieses Dokument ist anzuwenden für Fasermischungen mit mehr als drei Bestandteilen, sofern die Kombination der Prüfverfahren auf einfache Fälle von Fasermischungen zurückgeht. Tabelle B.1 veranschaulicht die typischen ternären Mischungen und deren zugehörige anwendbare Teile der Normenreihe ISO 1833.

Textiles - Analyse chimique quantitative - Partie 2: Mélanges ternaires de fibres (ISO 1833-2:2020)

Le présent document spécifie des méthodes d'analyse quantitative de divers mélanges ternaires de fibres.
Le domaine d'application de chaque méthode d'analyse de mélanges, spécifié dans les différentes parties de l'ISO 1833, indique les fibres auxquelles la méthode est applicable.
Le présent document s'applique aux mélanges de fibres de plus de trois composants sous réserve que l'association des méthodes d'essai renvoie à des cas simples de mélanges de fibres. Le Tableau B.1 donne les mélanges ternaires types ainsi que les parties correspondantes applicables de la série ISO 1833.

Tekstilije - Kvantitativna kemijska analiza - 2. del: Trikomponentne mešanice vlaken (ISO 1833-2:2020)

General Information

Status
Published
Public Enquiry End Date
01-Dec-2019
Publication Date
10-Aug-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
15-Jul-2020
Due Date
19-Sep-2020
Completion Date
11-Aug-2020

RELATIONS

Buy Standard

Standard
SIST EN ISO 1833-2:2020
English language
24 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 1833-2:2020
01-september-2020
Nadomešča:
SIST EN ISO 1833-2:2013
Tekstilije - Kvantitativna kemijska analiza - 2. del: Trikomponentne mešanice
vlaken (ISO 1833-2:2020)

Textiles - Quantitative chemical analysis - Part 2: Ternary fibre mixtures (ISO 1833-

2:2020)

Textilien - Quantitative chemische Analysen - Teil 2: Ternäre Fasermischungen (ISO

1833-2:2020)

Textiles - Analyse chimique quantitative - Partie 2: Mélanges ternaires de fibres (ISO

1833-2:2020)
Ta slovenski standard je istoveten z: EN ISO 1833-2:2020
ICS:
59.060.01 Tekstilna vlakna na splošno Textile fibres in general
71.040.40 Kemijska analiza Chemical analysis
SIST EN ISO 1833-2:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 1833-2:2020
---------------------- Page: 2 ----------------------
SIST EN ISO 1833-2:2020
EN ISO 1833-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
ICS 59.060.01 Supersedes EN ISO 1833-2:2010
English Version
Textiles - Quantitative chemical analysis - Part 2: Ternary
fibre mixtures (ISO 1833-2:2020)

Textiles - Analyse chimique quantitative - Partie 2: Textilien - Quantitative chemische Analysen - Teil 2:

Mélanges ternaires de fibres (ISO 1833-2:2020) Ternäre Fasermischungen (ISO 1833-2:2020)

This European Standard was approved by CEN on 12 June 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 1833-2:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 1833-2:2020
EN ISO 1833-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 1833-2:2020
EN ISO 1833-2:2020 (E)
European foreword

This document (EN ISO 1833-2:2020) 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 January 2021, and conflicting national standards shall

be withdrawn at the latest by January 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 1833-2:2010.

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, 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 1833-2:2020 has been approved by CEN as EN ISO 1833-2:2020 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 1833-2:2020
---------------------- Page: 6 ----------------------
SIST EN ISO 1833-2:2020
INTERNATIONAL ISO
STANDARD 1833-2
Second edition
2020-06
Textiles — Quantitative chemical
analysis —
Part 2:
Ternary fibre mixtures
Textiles — Analyse chimique quantitative —
Partie 2: Mélanges ternaires de fibres
Reference number
ISO 1833-2:2020(E)
ISO 2020
---------------------- Page: 7 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents and apparatus ............................................................................................................................................................................... 2

6 Conditioning and testing atmosphere ............................................................................................................................................ 2

7 Sampling and pre-treatment of laboratory test sample .............................................................................................. 2

8 Procedure..................................................................................................................................................................................................................... 2

9 Calculation and expression of results ............................................................................................................................................. 2

9.1 General ........................................................................................................................................................................................................... 2

9.2 Calculation of percentages of mass of clean dry fibres, disregarding loss of fibre

mass during pre-treatment .......................................................................................................................................................... 3

9.2.1 Variant 1 .................................................................................................................................................................................. 3

9.2.2 Variant 2 .................................................................................................................................................................................. 4

9.2.3 Variant 3 .................................................................................................................................................................................. 4

9.2.4 Variant 4 .................................................................................................................................................................................. 5

9.3 Calculation of the percentage of each component with adjustment by agreed

moisture regains and, where appropriate, by correction factors for losses in mass

during pre- treatment operations .......................................................................................................................................... 6

9.4 Calculation of the quantitative analysis by manual separation .................................................................... 7

9.4.1 General...................................................................................................................................................................................... 7

9.4.2 Calculation of the percentage mass of clean dry fibre disregarding loss in

fibre mass during pre-treatment ....................................................................................................................... 7

9.4.3 Calculation of the percentage of each component with adjustment by
agreed moisture regain and, where appropriate, by correction factors for

losses in mass during pre-treatment .............................................................................................................. 8

10 Method of quantitative analysis by a combination of manual separation and

chemical means ..................................................................................................................................................................................................... 8

11 Precision of methods........................................................................................................................................................................................ 8

12 Test report ................................................................................................................................................................................................................... 8

Annex A (informative) Examples of the calculation of percentages of the components of

certain ternary mixtures using some of the variants described in 9.2 ........................................................9

Annex B (informative) Typical ternary mixtures which can be analysed using methods of

analysis of binary mixtures specified in the parts of ISO 1833 .........................................................................12

Bibliography .............................................................................................................................................................................................................................17

© ISO 2020 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)
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 second edition cancels and replaces the first edition (ISO 1833-2:2006), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— the Introduction has been deleted and relevant information have been moved to Clause 4;

— Clause 2 has been updated;
— the mandatory Clause 3 has been added;

— in Clause 4 (former Clause 3), the explanation of the 4 variants has been added;

— in 9.3, additional instruction in case of pre-treatment by extraction with light petroleum and water

has been introduced;
— in Table B.1
— reference to lyocell (beside viscose, cupro and/or modal) has been added;

— additional cases: n°36 for Variant 3, n°37 and n°38 for new fibres (elastolefin, melamine), n°39

and n°40 for mixtures with elastane have been introduced;

— the Bibliography has been updated (references to parts of ISO 1833 have been removed).

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 2020 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 1833-2:2020
INTERNATIONAL STANDARD ISO 1833-2:2020(E)
Textiles — Quantitative chemical analysis —
Part 2:
Ternary fibre mixtures
1 Scope

This document specifies methods of quantitative analysis of various ternary mixtures of fibres.

The field of application of each method for analysing mixtures, specified in the parts of ISO 1833,

indicates the fibres to which the method is applicable.

This document is applicable to mixtures of fibres with more than three components provided that

the combination of test methods leads back to simple cases of fibre mixtures. Table B.1 illustrates the

typical ternary mixtures and their applied corresponding parts of the ISO 1833 series.

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 1833-1:2020, Textiles — Quantitative chemical analysis — Part 1: General principles of testing

3 Terms and definitions
No terms and definitions are listed in this document.

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 http:// www .electropedia .org/
4 Principle

After identification of the components of a mixture, the non-fibrous matter is removed by a suitable

pre-treatment, and then one or more of the four variants of the process of selective solution described

in this clause is applied.

Except where this presents technical difficulties, it is preferable to dissolve the major fibre component

so as to obtain the minor fibre component as the final residue.

In general, the methods for quantitative chemical analysis of ternary fibre mixtures are based on the

selective solution of the individual components. Four variants of this procedure are possible:

— Variant 1: Using two different test specimens, component (a) is dissolved from the first test specimen

and component (b) from the second test specimen. The insoluble residues of each test specimen are

weighed and the percentage of each of the two soluble components is calculated from the respective

losses in mass. The percentage of the third component (c) is calculated by difference.

— Variant 2: Using two different test specimens, a component (a) is dissolved from the first test

specimen, and two components (a and b) from the second test specimen. The insoluble residue of the

© ISO 2020 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)

first test specimen is weighed and the percentage of the component (a) is calculated from the loss

in mass. The insoluble residue of the second test specimen is weighed: it corresponds to component

(c). The percentage of the third component (b) is calculated by difference.

— Variant 3: Using two different test specimens, two components (a and b) are dissolved from the first

test specimen and two components (b and c) from the second test specimen. The insoluble residues

correspond to the two components (c) and (a) respectively. The percentage of the third component

(b) is calculated by difference.

— Variant 4: Using only one test specimen, after removal of one of the components, the insoluble

residue formed by the two other fibres is weighed and the percentage of the soluble component

is calculated from the loss in mass. One of the two fibres of the residue is dissolved, the insoluble

component is weighed, and the percentage of the second soluble component is calculated from the

loss in mass. If this variant is used when a test specimen is subjected to the successive action of two

different solvents, correction factors shall be applied for possible losses in mass undergone by the

test specimen in the two treatments.

Where a choice is possible, it is recommended to use one of the first three variants. Where chemical

analysis is used, take care to choose methods prescribing solvents which dissolve only the required

fibre or fibres, and leave undissolved the other fibre or fibres.

In order to reduce the possibility of error to a minimum, it is recommended that, whenever possible,

chemical analysis using at least two of the four above-mentioned variants should be made.

NOTE By way of example, Annex B contains a certain number of ternary mixtures, together with methods

for analysing binary mixtures which can, in principle, be used for analysing these ternary mixtures.

If the fibre mixture in a sample contains more than 3 components, where relevant, the application of

combined manual separations and chemical analysis leads to decrease the number of components in

sub-samples so that the given procedure in ISO 1833-1 or ISO 1833-2 can be applied.

5 Reagents and apparatus
Use the apparatus and reagents described in ISO 1833-1.
6 Conditioning and testing atmosphere
See ISO 1833-1.
7 Sampling and pre-treatment of laboratory test sample
See ISO 1833-1.
8 Procedure
See ISO 1833-1.
9 Calculation and expression of results
9.1 General

Express the mass of each component as a percentage of the total mass of fibre present in the mixture.

Calculate the result on the basis of clean dry mass, to which is applied firstly the agreed moisture regain

and secondly the correction factor necessary to take account of loss of matter during pre-treatment and

analysis.
2 © ISO 2020 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)

9.2 Calculation of percentages of mass of clean dry fibres, disregarding loss of fibre

mass during pre-treatment
NOTE Some examples of calculation are given in Annex A.
9.2.1 Variant 1

Formulae (1) to (3) are applied where a component of the mixture is removed from one specimen and

another component from a second specimen.
d r r  d 
2 1 2 2
P =− d ×+ ×−1 ×100 (1)
 
 
1 2
d m m d
  
1 1 2 1
d r r d
  
4 2 1 4
P =− d ×+ ×− 1 × 100 (2)
  
2 4
d m m d
 3 2 1  3 
PP=− 100 +P (3)
31 2
where

P is the percentage of the first clean dry component (component in the first specimen soluble in

the first reagent);

P is the percentage of the second clean dry component (component in the second specimen

soluble in the second reagent);

P is the percentage of the third clean dry component (component undissolved in both specimens);

m is the dry mass of the first specimen after pre-treatment;
m is the dry mass of the second specimen after pre-treatment;

r is the dry mass of the residue after removal of the first component from the first specimen in

the first reagent;

r is the dry mass of the residue after removal of the second component from the second

specimen in the second reagent;

d is the correction factor for loss in mass, in the first reagent, of the second component

undissolved in the first specimen;

d is the correction factor for loss in mass, in the first reagent, of the third component

undissolved in the first specimen;

d is the correction factor for loss in mass, in the second reagent, of the first component

undissolved in the second specimen;

d is the correction factor for loss in mass, in the second reagent, of the third component

undissolved in the second specimen.
The values of d are indicated in the relevant parts of the ISO 1833 series.
© ISO 2020 – All rights reserved 3
---------------------- Page: 13 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)
9.2.2 Variant 2

Formulae (4) to (6) are applied in cases where a component (a) is removed from the first test specimen,

leaving as residue, the other two components (b + c), and the two components (a + b) are removed from

the second test specimen, leaving as residue the third component (c).
PP=−100 +P (4)
12 3
dr d
11 1
P =×100 −× P (5)
2 3
m d
1 2
P =× 100 (6)
where

P is the percentage of the first clean dry component (component of the first specimen soluble in

the first reagent);

P is the percentage of the second clean dry component (component soluble, at the same time as

the first component of the second specimen, in the second reagent);

P is the percentage of the third clean dry component (component undissolved in both specimens);

m is the dry mass of the first specimen after pre-treatment;
m is the dry mass of the second specimen after pre-treatment;

r is the dry mass of the residue after removal of the first component from the first specimen in

the first reagent;

r is the dry mass of the residue after removal of the first and second components from the sec-

ond specimen in the second reagent;

d is the correction factor for loss in mass in the first reagent, of the second component undis-

solved in the first specimen;

d is the correction factor for loss in mass, in the first reagent, of the third component undis-

solved in the first specimen;

d is the correction factor for loss in mass, in the second reagent, of the third component undis-

solved in the second specimen.
The values of d are indicated in the relevant parts of the ISO 1833 series.
9.2.3 Variant 3

Formulae (7) to (9) are applied where two components (a + b) are removed from a specimen, leaving

as residue the third component (c), then two components (b + c) are removed from another specimen

leaving as residue, the first component (a):
P =× 100 (7)
PP=−100 +P (8)
21 3
4 © ISO 2020 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)
P =× 100 (9)
where

P is the percentage of the first clean dry component (component soluble in the first specimen in

the first reagent);

P is the percentage of the second clean dry component (component soluble in the first specimen

in the first reagent and in the second specimen soluble in the second reagent);

P is the percentage of the third clean dry component (component soluble in the second speci-

men in the second reagent);
m is the dry mass of the first specimen after pre-treatment;
m is the dry mass of the second specimen after pre-treatment;

r is the dry mass of the residue after removal of the first and second components from the first

specimen with the first reagent;

r is the dry mass of the residue after removal of the second and third components from the

second specimen with the second reagent;

d is the correction factor for loss in mass in the first reagent, of the third component undis-

solved in the first specimen;

d is the correction factor for loss in mass, in the second reagent, of the first component undis-

solved in the second specimen.
The values of d are indicated in the relevant parts of ISO 1833.
9.2.4 Variant 4

Formulae (10) to (12) are applied where two components are successively removed from the mixture

using the same test specimen:
PP=−100 +P (10)
12 3
dr d
11 1
P =×100 −× P (11)
2 3
m d
P =× 100 (12)
where
P is the percentage of the first clean dry component (first soluble component);

P is the percentage of the second clean dry component (second soluble component);

P is the percentage of the third clean dry component (undissolved component);
m is the dry mass of the test specimen after pre-treatment;

r is the dry mass of the residue after removal of the first component by the first reagent;

© ISO 2020 – All rights reserved 5
---------------------- Page: 15 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)

r is the dry mass of the residue after removal of the first and second components by the first

and second reagents;

d is the correction factor for loss in mass of the second component in the first reagent;

d is the correction factor for loss in mass of the third component in the first reagent;

d is the correction factor for loss in mass of the third component in the first and second reagents.

The values of d are indicated in the relevant parts of ISO 1833.
Wherever possible, d should be determined in advance by experimental methods.
9.3 Calculation of the percentage of each component with adjustment by agreed

moisture regains and, where appropriate, by correction factors for losses in mass during

pre- treatment operations
ab+ ab+ ab+
11 22 33
A=+1 B =+1 C =+1 (13)
100 100 100
hence
P = × 100 (14)
PA++PB PC
12 3
P = × 100 (15)
PA++PB PC
12 3
P = × 100 (16)
PA++PB PC
12 3
PP=−100 +P (17)
31AA 2A
where

P is the percentage of the first clean dry component, including moisture content and loss in

mass during pre-treatment;

P is the percentage of the second clean dry component, including moisture content and loss in

mass during pre-treatment;

P is the percentage of the third clean dry component, including moisture content and loss in

mass during pre-treatment;

P is the percentage of the first clean dry component obtained by one of the formulae given in 9.2;

P is the percentage of the second clean dry component obtained by one of the formulae

given in 9.2;

P is the percentage of the third clean dry component obtained by one of the formulae given in 9.2;

a is the agreed moisture regain of the first component;
a is the agreed moisture regain of the second component;
6 © ISO 2020 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 1833-2:2020
ISO 1833-2:2020(E)
a is the agreed moisture regain of the third component;
b is the percentage of loss in mass during pre-treatment of the first component;

b is the percentage of loss in mass during pre-treatment of the second component;

b is the percentage of loss in mass during pre-treatment of the third component.

Where a pre-treatment is used, the values of b , b and b should be determined if possible, by

1 2 3

submitting each of the pure fibre components to the pre-treatment applied in the analysis. Pure fibres

are those free from all non-fibrous material except that which they normally contain (either naturally

or because of the manufactu
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.