Fibre-reinforced composites — Method for accelerated moisture absorption and supersaturated conditioning by moisture using sealed pressure vessel

This document specifies accelerated moisture absorption properties and supersaturated conditioning by moisture for fibre-reinforced plastics) using sealed pressure vessel at higher temperature than 100 °C with saturated water vapour at used heating temperature. The purpose of this moisture absorbing procedure is to screen test specimens with moisture by mechanical or thermal properties. This document applies to carbon-fibre materials and their products with either thermoset or thermoplastic matrices, with a Tg greater than 150 °C. This document can also apply to materials reinforced with other fibres (e.g. glass-fibres) with a Tg greater than 150 °C.

Composites renforcés de fibres — Méthode pour l'absorption accélérée de l'humidité et le conditionnement sursaturé en humidité à l'aide d'un récipient sous pression scellé

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Status
Published
Publication Date
29-Sep-2020
Current Stage
6060 - International Standard published
Start Date
30-Sep-2020
Completion Date
30-Sep-2020
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ISO 22836:2020 - Fibre-reinforced composites -- Method for accelerated moisture absorption and supersaturated conditioning by moisture using sealed pressure vessel
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INTERNATIONAL ISO
STANDARD 22836
First edition
2020-09
Fibre-reinforced composites —
Method for accelerated moisture
absorption and supersaturated
conditioning by moisture using sealed
pressure vessel
Composites renforcés de fibres — Méthode pour l'absorption
accélérée de l'humidité et le conditionnement sursaturé en humidité à
l'aide d'un récipient sous pression scellé
Reference number
ISO 22836:2020(E)
ISO 2020
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ISO 22836:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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ii © ISO 2020 – All rights reserved
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ISO 22836:2020(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

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

5 Apparatus ..................................................................................................................................................................................................................... 2

6 Test procedure ........................................................................................................................................................................................................ 4

6.1 Weighing test specimens ................................................................................................................................................................ 4

6.2 Obtaining supersaturated moisture absorption ........................................................................................................ 4

6.3 Sampling of test materials with supersaturated moisture content ........................................................... 4

6.4 Confirming the saturated moisture absorbing ............................................................................................................ 4

6.5 Measuring mechanical or thermal properties ............................................................................................................. 5

7 Precision ....................................................................................................................................................................................................................... 5

8 Test reports ................................................................................................................................................................................................................ 6

Annex A (informative) Examples of CFRP and CFRTP specimens with supersaturated

moisture condition ............................................................................................................................................................................................. 7

Bibliography .............................................................................................................................................................................................................................11

© ISO 2020 – All rights reserved iii
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ISO 22836:2020(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 61, Plastics, Subcommittee SC 13,

Composites and reinforcement fibres.

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
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ISO 22836:2020(E)
Introduction

Mechanical properties of fibre reinforced thermoset or thermoplastics with saturated moisture

content under used conditions need to be determined for the specification of these materials. However,

the moisture content of the fibre reinforced thermoset or thermoplastic materials immediately after

production are usually lower than that during use, because the production process is under a higher

temperature and uses dried ingredients for optimum quality control. The fibre reinforced materials

absorb moisture under the used conditions and reach a saturated moisture content after a long period,

for example after 6 months. Accordingly, the accelerated moisture absorption method (70 °C, 75 %

RH) is specified in ASTM D5229/D5229M for determining the properties at saturation. However, the

absorption time is still long (over three months) using this method.

This document specifies a method for obtaining practical saturated moisture absorption for effective

and shorter research and development process of thermoset and thermoplastic materials. The method

uses a sealed pressure vessel at a higher temperature with saturated water vapour condition (120 °C,

0,2 MPa of water vapour pressure).
© ISO 2020 – All rights reserved v
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INTERNATIONAL STANDARD ISO 22836:2020(E)
Fibre-reinforced composites — Method for accelerated
moisture absorption and supersaturated conditioning by
moisture using sealed pressure vessel
1 Scope

This document specifies accelerated moisture absorption properties and supersaturated conditioning

by moisture for fibre-reinforced plastics) using sealed pressure vessel at higher temperature than

100 °C with saturated water vapour at used heating temperature.

The purpose of this moisture absorbing procedure is to screen test specimens with moisture by

mechanical or thermal properties.

This document applies to carbon-fibre materials and their products with either thermoset or

thermoplastic matrices, with a T greater than 150 °C. This document can also apply to materials

reinforced with other fibres (e.g. glass-fibres) with a T greater than 150 °C.
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 472, Plastics — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.

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/
3.1
additional moisture content

mass percentage of additionally absorbing moisture in the test material to total mass of the material

and moisture already existing in this material
Note 1 to entry: See Formula (1).
3.2
initial moisture content
mass percentage of absorbed moisture in the test material at the initial time
Note 1 to entry: See Formula (3).
3.3
supersaturated conditioning by moisture

moisture absorbing conditions in the test material at room temperature cooled from the saturated

moisture absorbing condition at higher temperature and higher humidity, such as saturated water

vapour pressure at used higher temperature
© ISO 2020 – All rights reserved 1
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ISO 22836:2020(E)
3.4
accelerated moisture absorption

moisture absorption by process with specific conditions such as higher temperature (e.g. 120 °C) and

higher pressure of moisture (0,2 MPa) to obtain saturated moisture content (3.5) during shorter time

3.5
saturated moisture content

moisture content from absorption condition with supersaturated moisture at lower temperature (e.g.

room temperature) from higher temperature (e.g. 120 °C) where specimen has saturated moisture content

4 Principle

To obtain almost similar saturated moisture condition in a test material at room temperature for

shorter time, the test material absorbs moisture at higher temperature and higher humidity conditions

such as 120 °C and 0,2 MPa of saturated water vapour pressure without air (oxygen) gas.

Higher temperature causes higher diffusion rate of water molecules in materials and higher water

vapour pressure causes higher frequencies of water molecules uptake at the surface of the material

from outside. Therefore, equilibrium and saturated moisture condition to the materials is obtained

during shorter time. However, if this material with saturated moisture is cooled to room temperature,

this material absorbs supersaturated moisture because of slow diffusion rate inside of water molecules

and slow releasing rate of water molecules at the surface.

In this way, supersaturated moisture condition for thermoset and thermoplastic matrices is obtained. It

is important that this procedure does not cause degradation of the test material. Mechanical properties

should be monitored to be stable during repeating these absorbing and desorbing (drying) processes.

In addition, this condition is simulated condition for real condition to obtain saturated equilibrium

moisture content at room tem
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