Rigid cellular plastics — Determination of water vapour transmission properties

ISO 1663:2007 specifies a method of determining the water vapour transmission rate, water vapour permeance, water vapour permeability and water vapour diffusion resistance index for rigid cellular plastics. The scope of this method provides for the testing of rigid cellular materials that have thicknesses from 10 mm upwards and which may, as an integral part of the material, contain natural skins or adhered facings of some different material. Three different sets of temperature and humidity conditions are provided, as follows: 38 °C and a relative-humidity gradient across the test specimen of 0 % to 88 %; 23 °C and a relative-humidity gradient across the test specimen of 0 % to 85 %; 23 °C and a relative-humidity gradient across the test specimen of 0 % to of 50 %. The results obtained by this method are suitable for design purposes and production control, and for inclusion in product specifications. The method is suitable for materials which have water vapour transmission rates in the range 3 ng/(m2.s) to 200 ng/(m2.s).

Plastiques alvéolaires rigides — Détermination des caractéristiques de transmission de la vapeur d'eau

General Information

Status
Published
Publication Date
16-Apr-2007
Current Stage
9092 - International Standard to be revised
Start Date
09-Oct-2009
Completion Date
05-Oct-2020
Ref Project

RELATIONS

Buy Standard

Standard
ISO 1663:2007 - Rigid cellular plastics -- Determination of water vapour transmission properties
English language
14 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 1663
Third edition
2007-05-01
Rigid cellular plastics — Determination of
water vapour transmission properties
Plastiques alvéolaires rigides — Détermination des caractéristiques de
transmission de la vapeur d'eau
Reference number
ISO 1663:2007(E)
ISO 2007
---------------------- Page: 1 ----------------------
ISO 1663:2007(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2007

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2007 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 1663:2007(E)
Contents Page

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

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

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

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

4 Principle................................................................................................................................................. 2

5 Apparatus and materials...................................................................................................................... 2

6 Sample ................................................................................................................................................... 3

7 Test specimens ..................................................................................................................................... 5

8 Procedure .............................................................................................................................................. 5

9 Expression of results ........................................................................................................................... 7

10 Precision................................................................................................................................................ 8

11 Test report ............................................................................................................................................. 9

Annex A (normative) Preparation of test assemblies................................................................................... 10

Annex B (informative) Derivation of the formula for calculating the water vapour diffusion

resistance index.................................................................................................................................. 12

© ISO 2007 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 1663:2007(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 1663 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.

This third edition cancels and replaces the second edition (ISO 1663:1999), of which it constitutes a minor

revision. The main changes are as follows:

⎯ the tolerance limits required for the humidity in the constant-humidity chamber (see 5.6 and 8.1) have

been relaxed from ± 2 % to ± 5 %;

⎯ in Table 1, the third set of test conditions has been corrected to 38 °C and 0 % to 88 % RH.

iv © ISO 2007 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 1663:2007(E)
Rigid cellular plastics — Determination of water vapour
transmission properties
1 Scope

This International Standard specifies a method of determining the water vapour transmission rate, water

vapour permeance, water vapour permeability and water vapour diffusion resistance index for rigid cellular

plastics.

The scope of this method provides for the testing of rigid cellular materials that have thicknesses from 10 mm

upwards and which may, as an integral part of the material, contain natural skins or adhered facings of some

different material.

Three different sets of temperature and humidity conditions are provided, as follows:

a) 38 °C and a relative-humidity gradient across the test specimen of 0 % to 88 %;

b) 23 °C and a relative-humidity gradient across the test specimen of 0 % to 85 %;

c) 23 °C and a relative-humidity gradient across the test specimen of 0 % to of 50 %.

The results obtained by this method are suitable for design purposes and production control, and for inclusion

in product specifications.

The method is suitable for materials which have water vapour transmission rates in the range 3 ng/(m⋅s) to

200 ng/(m⋅s).
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 291, Plastics — Standard atmospheres for conditioning and testing

ISO 483, Plastics — Small enclosures for conditioning and testing using aqueous solutions to maintain the

humidity at a constant value
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2007 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 1663:2007(E)
3.1
water vapour transmission rate

quantity of water vapour transmitted through unit area of a test specimen in unit time under specified

conditions of temperature, humidity and thickness
−2 −1
NOTE 1 It is expressed in micrograms per square metre per second (µg⋅m ⋅s ).

NOTE 2 The values obtained for the water vapour transmission rate are specific to the thickness of the test specimen.

3.2
water vapour permeance

ratio of the water vapour transmission rate for a test specimen to the vapour pressure difference between the

two specimen faces during the test
−2 −1 −1

NOTE 1 It is expressed in nanograms per square metre per second per pascal (ng⋅m ⋅s ⋅Pa ).

NOTE 2 Water vapour permeance values are specific to the thickness at which the specimen was tested.

3.3
water vapour resistance
inverse of water vapour permeance
3.4
water vapour permeability
numerical value of the product of permeance and thickness

NOTE 1 It is the quantity of water vapour transmitted per unit time through a given area of the material per unit vapour

pressure difference between its faces for a unit thickness.
−1 −1 −1

NOTE 2 It is expressed in nanograms per metre per second per pascal (ng⋅m ⋅s ⋅Pa ).

NOTE 3 For homogeneous materials, values obtained for water vapour permeability are a property of the material.

3.5
water vapour diffusion resistance index
ratio of the water vapour permeability of air to that of the material concerned

NOTE 1 It indicates how much less permeable the material is than an equally thick layer of stationary air at the same

temperature.
NOTE 2 It is dimensionless.

NOTE 3 For homogeneous materials, values obtained for water vapour diffusion resistance index are a property of the

material.
4 Principle

A test specimen is sealed to the open mouth of a test dish containing a desiccant. The assembly is then

placed in an atmosphere whose temperature and humidity are controlled. Periodic weighings of the assembly

are made to determine the rate of water vapour transmission through the specimen into the desiccant.

5 Apparatus and materials

5.1 Shallow circular open containers, made of a material impermeable to water vapour, such as glass or

metal, of 65 mm minimum diameter and with tops slightly belled out to admit a wax seal. See Annex A for

typical assemblies and 5.3 for assemblies requiring a template.
2 © ISO 2007 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 1663:2007(E)

5.2 Measuring instruments, capable of determining linear dimensions in accordance with the

requirements of ISO 1923.

5.3 Circular template (with edge tapered to facilitate removal after use), to duplicate the exposed area of

the specimen to the nearest 0,1 cm . The template shall have an area that is at least 90 % of the exposed

surface of the specimen in order to reduce the edge effect due to a non-linear vapour seal.

5.4 Pot or dish, for melting the sealant wax (5.8).

5.5 Analytical balance, capable of weighing the test assembly to an accuracy of 0,1 mg.

5.6 Constant-temperature, constant-humidity chamber, capable of being maintained within ± 5 % of the

required relative humidity and within ± 1 °C of the required temperature, and with a provision for continuous

monitoring of the temperature and humidity during the test period. The chamber may be a room. Alternatively,

if the chamber corresponds to that shown in Figure 1, then the air circulation shall be capable of being

switched off to permit accurate weighings.

NOTE If a conditioned room is used for the test, then it is not necessary to use the chamber shown in Figure 1.

5.7 The following solutions can be used with non-injection-type humidity cabinets:

5.7.1 For testing at 38 °C and a relative humidity of 88 %: saturated potassium nitrate solution

containing a large excess of the undissolved salt at 38 °C.

5.7.2 For testing at 23 °C and a relative humidity of 85 %: saturated chloride solution containing a large

excess of the undissolved salt at 23 °C.

NOTE 1 For testing at 23 °C and a relative humidity of 50 %, there is no suitable salt which would meet the tolerance

required by 8.1.

NOTE 2 For laboratories which do not have a suitable humidity chamber, the following solutions are suggested as

alternatives, although the user should be aware that they do not comply with this International Standard:

a) a saturated aqueous solution of magnesium nitrate hexahydrate containing a large excess of the undissolved salt at

23 °C;

b) a saturated aqueous solution of sodium dichromate dihydrate containing a large excess of the undissolved salt at

23 °C.
More information about constant-humidity solutions may be found in ISO 483.

5.8 Sealant wax, unaffected by the test conditions. The following are examples of suitable sealants:

5.8.1 A mixture of 90 % microcrystalline wax and 10 % of a plasticizer (for example low-molecular-mass

polyisobutylene).

5.8.2 A mixture of 60 % microcrystalline wax and 40 % refined crystalline paraffin.

5.9 Anydrous calcium chloride desiccant, with particles about 5 mm in diameter, free from fines, which

would pass a No. 30 (600 µm) sieve.
5.10 Limiting ring, for use with thin specimens (see Figure A.1).
6 Sample

The sample shall be representative of the material. It may contain the natural skin or facings adhered to it

which constitute part of the material.
© ISO 2007 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 1663:2007(E)

Some cellular plastics have skins of a density significantly different from that of the core material. If it is

intended to determine the permeability of the material, the specimen shall be homogeneous and tested

without the skin and facing.
Key
1 controlled-environment test chamber with “glove box” type access door
2 balance
3 suspended weighing platform
4 test assembly during weighing
Figure 1 — Recommended specimen exposure and measurement when operator
cannot enter controlled environment
4 © ISO 2007 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 1663:2007(E)
7 Test specimens
7.1 Dimensions
7.1.1 Shape and fit

Specimens shall be cut to fit the dimensions of the test assembly used (see Annex A).

7.1.2 Thickness

The thickness of specimens shall not be less than 10 mm, except for materials produced thinner than 10 mm

which shall be tested at the manufactured thickness. A specimen thickness of 25 mm is preferred.

7.1.3 Exposed area

The diameter of specimens shall not be less than four times the specimen thickness. The minimum exposed

area shall be 50 cm .
7.2 Number
A minimum of five specimens shall be tested.

When the material to be tested is suspected of being anisotropic, the test specimens shall be cut such that the

parallel face
...

Questions, Comments and Discussion

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