ISO 787-5:2026

Overview

ISO 787-5:2026 is an internationally recognized standard developed by the International Organization for Standardization (ISO) under the ISO 787 series. This document outlines general test methods for pigments and extenders, specifically detailing the procedure for determining the oil absorption value. The oil absorption value is a crucial parameter in industries relying on pigments and extenders, such as paints, coatings, plastics, inks, and construction materials. By standardizing the determination of oil absorption, ISO 787-5:2026 promotes consistency, reliability, and quality assurance in material characterization processes.

Key Topics

• Purpose of the Standard:
  ISO 787-5:2026 provides clear methodologies for measuring how much oil (typically refined linseed oil) a pigment or extender can absorb under specified testing conditions. This value is often compared to a reference or an agreed sample to ensure product conformity.

• Test Methods:
  Two standardized methods are described:

  • The burette method (volume-based)
  • The dropping bottle method (mass-based)

• Sample Conditioning:

  • Samples and reagents are conditioned at (23 ± 2) °C and relative humidity of (50 ± 5) % for a minimum of 16 hours to ensure reproducibility.

• Result Expression:

  • Results are reported in either grams or milliliters of oil per 100 grams of sample.

• Reporting Requirements:

  • Comprehensive reporting is mandated, including product identification, method used, environmental conditions, results, deviations, anomalies, and the date of testing.

Applications

The determination of oil absorption value is essential across various industries that utilize pigments and extenders. Its main applications include:

• Paints and Coatings:

  • Oil absorption indicates how much binder (oil) is required to achieve optimal dispersion and consistency in paint formulations, directly impacting product performance and cost.

• Plastics and Polymer Composites:

  • Understanding oil absorption helps optimize mixtures, improving material properties and processing behavior.

• Printing Inks:

  • Ensures the right balance between pigment/extender and vehicle components, affecting ink viscosity and print quality.

• Construction Materials:

  • Used in the formulation of colored cement, mortar, and other building materials where pigment performance is critical.

• Quality Control and Product Development:

  • Meets regulatory and performance requirements by verifying conformity to internal or external standards.

The standard benefits manufacturers, testing laboratories, product developers, and quality assurance professionals by enabling repeatable and comparable results.

Related Standards

ISO 787-5:2026 makes reference to several other international standards integral to the testing process:

• ISO 150: Raw, refined and boiled linseed oil for paints and varnishes - Specifications and methods of test.
• ISO 385: Laboratory glassware - Burettes.
• ISO 15528: Paints, varnishes and raw materials for paints and varnishes - Sampling.
• ISO 2811-1: Paints and varnishes - Determination of density - Part 1: Pycnometer method.
• ISO 2811-3: Paints and varnishes - Determination of density - Part 3: Oscillation method.
• ISO 18451-1: Pigments, dyestuffs and extenders - Terminology - Part 1: General terms.

These standards ensure accuracy, reliability, and harmonization across testing procedures for pigments and extenders.

ISO 787-5:2026 is an essential resource for anyone involved in the testing, formulation, or application of pigments and extenders, contributing to quality assurance and product consistency in the colorants industry. For more information, visit www.iso.org.