Overview
SIST EN ISO 787-14:2019 outlines a standardized method for determining the electric resistivity (or specific electric conductivity) of aqueous extracts of pigments and extenders. Developed by the International Organization for Standardization (ISO) and adopted by the Slovenian Institute for Standardization (SIST), this document ensures the uniform testing of electrical properties in pigment samples, except where pigments are water-soluble. The test delivers consistent and reliable results that are crucial for product comparison, quality control, and compliance across the paints, coatings, plastics, and pigment manufacturing industries.
Key Topics
- Scope of Application: The method applies to all pigments and extenders excluding those soluble in water. The test procedure accommodates cold extraction upon agreement between parties.
- Measurement Principles: Focuses on resistivity (specific electric resistance) or its reciprocal, specific electric conductivity, as measured in the aqueous extract of a pigment.
- Independence from Soluble Content: The resistivity measured is considered an intrinsic property of the pigment, not directly linked to the quantity of water-soluble substances.
- Standardized Procedure: Includes steps for sample preparation, wetting with ethanol if required, extraction (by heating or at room temperature), filtration, and measurement using a calibrated conductivity meter.
- Test Reporting: Ensures thorough documentation of test conditions, handling of deviations, and identification of all sample and testing parameters.
Applications
The standardized procedure in ISO 787-14:2019 is widely used in:
- Paints and Coatings Manufacturing: Accurate measurement of pigment resistivity supports the development of high-performance coatings by informing decisions on pigment selection and compatibility.
- Quality Control: Enables manufacturers and laboratories to verify the consistency of pigment batches, supporting stricter quality standards and regulatory compliance.
- Product Development: R&D teams utilize resistivity data to optimize pigment formulations for specific electrical or dispersive properties in end-use applications.
- Pigment and Extender Production: Producers use the method to certify product quality, fulfill client specifications, and benchmark products internationally.
- Comparative Analysis: Provides a consistent basis for comparing pigments and extenders from different sources or production processes.
Related Standards
Organizations involved in pigment testing and quality assurance may also find the following standards relevant:
- ISO 15528: Paints, varnishes, and raw materials for paints and varnishes – Sampling methods, referenced for taking representative samples in pigment testing.
- ISO 18451-1: Pigments, dyestuffs, and extenders – General terminology, offering essential definitions for consistent interpretation of standards.
- ISO 787 Series: Covers general methods of test for pigments and extenders, offering standardized approaches for diverse quality and performance attributes.
- EN ISO 787-14:2019: The European adoption of ISO 787-14:2019, implemented as a national standard across European Union member states.
Keywords: ISO 787-14:2019, pigment resistivity, aqueous extract conductivity, pigment testing, paints and coatings, extenders, quality control, electric conductivity, standard methods, pigments and extenders standards.
