ISO 6450:2005
(Main)Rubber- or plastics-coated fabrics — Determination of resistance to liquids
Rubber- or plastics-coated fabrics — Determination of resistance to liquids
ISO 6450:2005 specifies two methods (methods 1 and 2) of evaluating the resistance of fabrics coated with plastics or with vulcanized rubber to the action of liquids by measurement of selected properties of the materials before and after immersion in selected liquids. The difference between the two methods is as follows: In method 1, excess liquid is removed from the test pieces, after immersion, by wiping. In method 2, the test pieces are immersed in a volatile liquid and excess liquid is subsequently removed by drying in an oven.
Supports textiles revêtus de caoutchouc ou de plastique — Détermination de la résistance aux liquides
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6450
First edition
2005-09-01
Rubber- or plastics-coated fabrics —
Determination of resistance to liquids
Supports textiles revêtus de caoutchouc ou de plastique —
Détermination de la résistance aux liquides
Reference number
ISO 6450:2005(E)
©
ISO 2005
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ISO 6450:2005(E)
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ii © ISO 2005 – All rights reserved
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ISO 6450:2005(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Principle. 1
4 Test liquids for methods 1 and 2. 1
5 Test conditions for methods 1 and 2. 2
6 Conditioning atmosphere for methods 1 and 2. 2
7 Apparatus for methods 1 and 2. 2
8 Method 1 — Immersion and subsequent removal of excess liquid by wiping. 3
9 Method 2 — Immersion in a volatile test liquid and subsequent drying of the test pieces. 4
10 Test report . 4
Annex A (informative) Reference liquids . 5
Annex B (informative) Standard temperatures of immersion. 9
Bibliography . 10
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ISO 6450:2005(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.
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 6450 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
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INTERNATIONAL STANDARD ISO 6450:2005(E)
Rubber- or plastics-coated fabrics — Determination of
resistance to liquids
1 Scope
This International Standard specifies two methods (methods 1 and 2) of evaluating the resistance of fabrics
coated with plastics or with vulcanized rubber to the action of liquids by measurement of selected properties of
the materials before and after immersion in selected liquids.
The difference between the two methods is as follows:
⎯ In method 1, excess liquid is removed from the test pieces, after immersion, by wiping.
⎯ In method 2, the test pieces are immersed in a volatile liquid and excess liquid is subsequently removed
by drying in an oven.
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 2231, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing
ISO 2286-1, Rubber- or plastics-coated fabrics — Determination of roll characteristics — Part 1: Methods for
determination of length, width and net mass
3 Principle
This International Standard provides a procedure for exposing test pieces to the influence of liquids under
defined conditions of temperature and time. Selected properties are determined in accordance with the
relevant test method standards. Test pieces are then immersed in selected liquid(s) and the properties
determined again. The percentage change or the values before and after immersion are measures of the
resistance of the material to the selected liquid(s).
4 Test liquids for methods 1 and 2
SAFETY PRECAUTIONS — Appropriate safety precautions should be taken when preparing and
handling test liquids, especially those known to be toxic, corrosive or flammable. Products giving off
fumes should be handled only under an efficiently ventilated hood, corrosive products should not be
allowed to come into contact with the skin or ordinary clothing, and flammable products should be
kept away from any source of ignition.
In addition, attention is drawn to the damage which can be caused by corrosive test liquids to test
equipment (e.g. clamps or jaws).
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ISO 6450:2005(E)
As commercial liquids may not have an entirely constant composition, a standard immersion liquid consisting
of a well-defined chemical compound or a mixture of such compounds should preferably be used. Suitable
liquids are given in Annex A.
If a commercial liquid is used, the test report shall mention all the available information about its origin,
composition, properties, e.g. viscosity, aniline point, etc., and batch number.
NOTE For test purposes, it is usually desirable to use the liquid(s) with which the coated fabric will come into contact
during use. When determining the effect of solutions of chemicals, the concentration of the solution should be appropriate
to the proposed application.
5 Test conditions for methods 1 and 2
5.1 Temperature
Where appropriate, use an immersion temperature T approximating to that encountered during use. Maintain
the immersion temperature at T ± 2 °C.
Preferred immersion temperatures are given in Annex B.
5.2 Immersion period
The following immersion periods are recommended:
22 h ± 0,25 h; 46 h ± 0,25 h; 72 h ± 2 h; 168 h ± 2 h; multiples of 7 days ± 2 h
NOTE When determining changes in physical properties, it is advisable to use a period of immersion which is long
enough to ensure that equilibrium is reached. To determine this equilibrium point, it is recommended that preliminary
measurements be carried out using several different periods of immersion, recording the results as a function of time.
Whenever practicable, the total period of immersion should extend well beyond the point at which the change in a property
reaches its maximum value.
5.3 Light
Immersion tests shall be conducted in the absence of direct light.
5.4 Time lapse between manufacturing and testing
The minimum time lapse between manufacturing and testing shall be 16 h.
6 Conditioning atmosphere for methods 1 and 2
Before immersion, test pieces shall be conditioned in one of the atmospheres defined in ISO 2231, unless
otherwise specified in the standard relevant to the property to be determined.
7 Apparatus for methods 1 and 2
The apparatus to be used is determined by the temperature of immersion, the volatility of the test liquid, the
dimensions of the test pieces and the number required for determining the selected property. At temperatures
appreciably below the boiling point of the test liquid, use a stoppered vessel, e.g. a glass bottle or tube, of
such dimensions that the test pieces remain completely immersed in the specified volume of test liquid and all
surfaces are completely exposed to the liquid without any restriction. At temperatures near the boiling point of
the test liquid, fit the vessel with a reflux condenser, or other suitable means of minimizing evaporation of the
test liquid, instead of the stopper.
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ISO 6450:2005(E)
8 Method 1 — Immersion and subsequent removal of excess liquid by wiping
8.1 Preparation of test pieces
Select properties that are considered relevant to the end-use (for example, tensile strength, coating adhesion,
mass per unit area, tear resistance and/or low-temperature properties).
For each property, cut from the usable width of the roll (as defined in ISO 2286-1) two sets of test pieces as
specified in the relevant test method standard (some commonly used test method standards are given in the
Bibliography).
Condition all the test pieces in accordance with Clause 6.
8.2 Determination of original properties before immersion
Determine the selected properties on the first set of test pieces using the relevant test method standards.
8.3 Immersion
Place the test pieces, suitably separated, in a vessel as described in Clause 7, with a volume of test liquid
(see Clause 4) that is at least 15 times the combined volume of the test pieces and sufficient to keep them
totally immersed. If the conditions of the test do not necessitate the use of a reflux condenser, stopper the
vessel. Maintain the test liquid at the test temperature T, within a tolerance of ± 2 °C, during the whole of the
exposure period.
8.4 Preparation of test pieces for redetermination of properties
At the end of the immersion period, bring the test pieces, if necessary, to the test temperature, preferably by
quickly transferring them to a fresh portion of test liquid at this temperature and allowing to stand for 5 min to
10 min.
Take the test pieces out of the test liquid and remove any liquid remaining on the surface of the test pieces
using a suitable method. The method of removing the liquid may vary with the nature of the liquid. When
mobile, volatile liquids like iso-octane and toluene are used, wipe the test pieces with a filter paper or a piece
of lint-free fabric. Some difficulty may be experienced in removing viscous, non-volatile liquids completely by
this method, and it may be necessary to dip the test pieces quickly in a suitable volatile liquid such as
methanol and wipe them again with filter paper or lint-free fabr
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