ISO 16533:2014

DRAFT INTERNATIONAL STANDARD ISO/DIS 16533
ISO/TC 38 Secretariat: JISC
Voting begins on Voting terminates on

2013-04-12 2013-07-12
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION  •  МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ  •  ORGANISATION INTERNATIONALE DE NORMALISATION


Textiles — Measurement of exothermic and endothermic
properties of textiles under humidity change
Textiles — Mesurage des propriétés exothermiques et endothermiques de textiles sous conditions d'humidité
changeantes

ICS 59.080.01









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©  International Organization for Standardization, 2013

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ISO/DIS 16533

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ISO/CD 16533
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and Definitions . 1
4 Symbols and units . 1
5 Principle. 2
6 Apparatus . 2
7 Reagent. 4
8 Preparation of the constant humidity containers . 5
9 Test procedure . 5
10 Test report . 9
Annex A (informative) Example of hygroscopic and exothermic property test . 10
Annex B (informative) Example of hygroemissive and endothermic property test . 11
Bibliography . 12

© ISO 2012 – All rights reserved iii

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ISO/CD 16533
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 16533 was prepared by Technical Committee ISO/TC 38, Textiles.
© ISO 2012 – All rights reserved iv

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ISO/CD 16533
Introduction
The thermal properties of textile materials contribute to wearer’s physiological comfort, product's durability, etc.
Hence, there are many kinds of products with specific thermal performances and various test methods for
them have been developed and standardized. But these tests should be conducted in certain humidity. The
method for thermal properties in elevated or reduced humidity has not been standardized.
All materials generate heat when absorbing moisture and absorb heat when releasing moisture. The heat of
absorption varies according to material, for example, the heat of absorption in wool fibre is much bigger than
that in common synthetic fibre. With this property, recently, some heat generating textiles have been
developed and applied to various products such as outdoor wear, sport wear, inner wear, special working
wear and health-care wear. Therefore the test for hygroscopic and exothermic property of textiles is needed
for both producers and customers. Despite these needs, the accurate and reliable information about
hygroscopic and exothermic property of textiles cannot be offered by absence of standard test method.
The exothermic and endothermic properties of textiles under the condition that environmental humidity is
changed can be measured with this proposed test method and apparatus.


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DIS DRAFT ISO/CD 16533

Textiles — Measurement of exothermic and endothermic
properties of textiles under humidity change
1 Scope
This standard method specifies method for the measurement of exothermic and endothermic properties by
moisture absorption and desorption in sheet-like textiles, e.g. fabrics, knit or nonwovens for clothing, bedding,
upholstery and similar textile products.
2 Normative references
The following referenced documents are indispensable for the application 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 3696:1987, Water for analytical laboratory use — Specification and test methods.
ISO 3801:1977, Textiles — Woven fabrics — Determination of mass per unit length and mass per unit area.
3 Terms and Definitions
For the purposes of this standard, the following definitions apply.
3.1
exothermic property
property of material whereby it releases heat to the surroundings
3.2
endothermic property
property of material whereby it absorbs heat from the surroundings
3.3
hygroscopic and exothermic property
property of material whereby it generates heat by absorbing moisture and releases the generated heat to its
surroundings where relative humidity changes from low to high over time.
3.4
hygroemissive and endothermic property
property of material whereby it loses heat and cools down by releasing moisture through evaporation to its
surroundings where relative humidity changes from high to low over time.
4 Symbols and units
T is ambient temperature in temperature and humidity controlled chamber, in degrees Celsius.
A
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ISO/CD 16533
RH is ambient relative humidity in temperature and humidity controlled chamber, in percent.
A
RH is relative humidity in first constant humidity container, starting humidity, in percent.
1
RH is relative humidity in second constant humidity container, target humidity, in percent.
2
T is peak temperature determined using temperature sensor with or without test specimen mounted on
peak
sensor probe in second constant humidity container during hygroscopic and exothermic property test,
in degrees Celsius.
T is bottom temperature determined using temperature sensor with or without test specimen mounted
bottom
on sensor probe in second constant humidity container during hygroemissive and endothermic
property t
...