SIST EN ISO 3344:1999

SLOVENSKI STANDARD
01-maj-1999
6UHGVWYD]DRMDþHQMH±'RORþHYDQMHGHOHåDYODJH,62
Reinforcement products - Determination of moisture content (ISO 3344:1997)
Verstärkungserzeugnisse - Bestimmung des Feuchtegehaltes (ISO 3344:1997)
Produits de renfort - Détermination du taux d'humidité (ISO 3344:1997)
Ta slovenski standard je istoveten z: EN ISO 3344:1997
ICS:
59.100.01 0DWHULDOL]DRMDþLWHY Materials for the
NRPSR]LWRYQDVSORãQR reinforcement of composites
in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
ISO
STANDARD 3344
Second edition
1997-05- 15
Reinforcement products - Determination
of moisture content
Produits de renfort - Determination du taux d ’humiditb
Reference number
I so 3344: 1997(E)
ISO 3344:1997(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. Esch 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
Iiaison with ISO, also take part in the work. ISO collaborates cjoselly with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
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.
International Standard ISO 3344 was prepared by Technical Committee ISO/TC 61) Plastics, Subcommittee SC 13,
Composites and reinforcement fibres.
This second edition cancels and replaces the first edition (ISO 3344:1977), which has been technically revised?
0 ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Internet central@ iso.ch
c=ch; a=400net; p=iso; o=isocs; s=central
x.400
Printed in Switzerland
ii
INTERNATIONAL STANDARD o Iso ISO 3344: 1997(E)
Determination of moisture content
Reinforcement products -
1 Scope
This International Standard specifies a method for the determination of the moisture content of reinforcement
products, such as continuous-filament yarn, staple-fibre yarn, rovings, chopped Strands, mats, fabrics and other
forms of reinforcement made from textile glass, carbon or aramid fibres.
2 Normative reference
The following Standard contains provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the edition indicated was valid. All Standards are subject to
revision, and Parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the Standard indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 291:- ‘), Plastics - Standard atmospheres for conditioning and testing.
3 Definition
For the purposes of this International Standard, the following definition applies:
3.1 moisture content: The mass of water contained in a product, determined by a specified method and
expressed as a percentage of the mass of the moist product.
4 Principle
A test specimen is weighed at ambient temperature, before and after drying at a temperature of 105 “C.
5 Apparatus
5.1 Forced-circulation oven, with an air-Change rate of 20 to 50 times per hour and capable of maintaining a
temperature of 105 “C + 3 “C or the Chosen temperature to within & 3 “C (see clause 4).
5.2 Desiccator, containing a suitable drying agent (for example silica gel, Calcium chloride or phosphorus
pentoxide).
5.3 Specimen holder, made of heat-resistant material, allowing the maximum air flow round the specimen and
from which there is no loss of material. This may be a porcelain crucible, an unoxidisable metal wire basket, etc.
NOTE - One holder may be used to hold several specimens if they tan be transferred from the holder to the oven without
loss of material.
1) To be published. (Revision of ISO 291 :1977)

0 ISO
ISO 3344: 1997(E)
5.4 Stainless-steel tweezers, for handling the specimen and specimen holder.
5.5 Balance, accurate to 0,l mg.
5.6 Polished metal template and suitable cutting tool, e.g. a knife, scissors or a rotary cutting disc (for fabrics
and mats) q
These two items may be replaced by a Punch.
5.7 Stoppered weighing bottle, for weighing aramid yarn and when the specimen is expected to have a moisture
content higher than 0,2 % (for example, specimens taken from the centre sf a package or wet chopped Strands).
6 Selection and number of test specimens
6.1 Selection of specimens
Unless indicated otherwise in the product specification or by the person requesting the determination, take the
specimens as described below:
6.1 .l Continuous-filament yarn, spun yarn, rovings
The way in which the test specimens are taken is intended to enable the moisture content in the surface layers of
the wound package to be checked.
Unwind and discard the outer layers, then, for each specimen, take a length of the wound package with a mass of at
least 5 g, but preferably between 15 g and 30 g.
In cases when the moisture content of the wound package is liable to increase towards the centre, the product
specification, or the person requesting the determination, may stipulate that the determination be carried out on one
or more specimens taken at one or more specified locations within the package. Care should be taken to avoid
injuty when cutting into a package in Order to resch the specimen Position at the centre. Weigh specimens taken in
this way as quickly as possible. For this purpose, the specimen may be placed in a previously weighed weighing
bottle (5.7).
6.1.2 Chopped Strands and milled fib
...