ISO 21318:2007

Plastics — Epoxy resins — Determination of electrical conductivity of aqueous resin extracts

ISO 21318:2007 specifies a method for the determination of the electrical conductivity of an aqueous extract obtained by extraction of an epoxy resin with water at 95 °C. The method is applicable only to epoxy resins that are in the molten state at the extraction temperature (95 °C). The method is important for epoxy resins which are used as insulation materials for electronic devices. The electrical conductivity of the extract is used as a measure of the concentration of the ionic species in the resin.

Plastiques — Résines époxy — Détermination de la conductivité électrique des extraits aqueux de résine

General Information

• Status: Published
• Publication Date: 23-Jan-2007
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: ISO/TC 61/SC 12 - Thermosetting materials
• Drafting Committee: ISO/TC 61/SC 12/WG 5 - Unsaturated polyesters, epoxy resins and other resins
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 04-Sep-2020

Relations

• Consolidated By: ISO 8536-11:2015 - Infusion equipment for medical use — Part 11: Infusion filters for single use with pressure infusion equipment
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21318
First edition
2007-02-01

Plastics — Epoxy resins — Determination
of electrical conductivity of aqueous
resin extracts
Plastiques — Résines époxy — Détermination de la conductivité
électrique des extraits aqueux de résine



Reference number
ISO 21318:2007(E)
©
ISO 2007

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ISO 21318:2007(E)
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©  ISO 2007
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ii © ISO 2007 – All rights reserved

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ISO 21318:2007(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 21318 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting
materials.
© ISO 2007 – All rights reserved iii

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ISO 21318:2007(E)
Introduction
Where epoxy resins are used as insulation for electronic devices, ionic impurities such as chloride, sodium
and catalyst residues present in the epoxy resin can cause failure of the device. Instead of determining these
impurities separately, a test method may be used to evaluate their contents as a whole by measuring the
electrical conductivity of a resin extract obtained by extraction of the resin with water at an elevated
temperature. Because of its practical usage and simplicity, this method is becoming widely used in the quality
control of epoxy resins for electronic insulation applications.

iv © ISO 2007 – All rights reserved

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INTERNATIONAL STANDARD ISO 21318:2007(E)

Plastics — Epoxy resins — Determination of electrical
conductivity of aqueous resin extracts
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