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
Standards Content (sample)
Plastics — Epoxy resins — Determination
of electrical conductivity of aqueous
Plastiques — Résines époxy — Détermination de la conductivité
électrique des extraits aqueux de résine
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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 qualitycontrol of epoxy resins for electronic insulation applications.
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INTERNATIONAL STANDARD ISO 21318:2007(E)
Plastics — Epoxy resins — Determination of electrical
conductivity of aqueous resin extracts