ISO 787-10:1993

Overview

ISO 787-10:1993 - General Methods of Test for Pigments and Extenders - Part 10: Determination of Density - Pyknometer Method is an international standard developed by the International Organization for Standardization (ISO). This standard establishes general procedures for determining the density of pigments and extenders using a pyknometer. The test provides a reliable way to measure the density by employing two distinct methods (Method A and Method B), each with detailed apparatus setups and procedural steps. ISO 787-10:1993 covers sampling techniques, the expression of results, and requirements for the test report, ensuring consistency and accuracy in testing across the global paints, coatings, and pigment industries.

Key Topics

• Purpose of the Standard
  ISO 787-10:1993 provides a uniform approach to density determination for pigments and extenders, enabling comparability and repeatability of test results.

• Pyknometer Methods (A and B)

  • Method A: Suitable for most pigments and extenders.
  • Method B: More convenient for pigments of lower density. Each method details required apparatus, such as pyknometers, vacuum systems, water baths, sieves, and balances.

• Sampling and Preparation
  The sampling procedure ensures a representative test portion. Proper sample drying and handling are important to avoid errors in density measurement.

• Determination of Density
  Outlines how to carry out the test using pyknometers and a suitable displacement liquid. Emphasizes care in eliminating air bubbles and maintaining precise temperature control for accurate results.

• Expression of Results
  Results are recorded as the density of the material, expressed in grams per millilitre at the test temperature. The mean value of two valid tests is reported, rounded to two decimal places.

• Test Report Requirements
  Specifies the information to include in the report, such as product identification, reference to ISO 787-10, method used, displacement liquid details, temperature, deviations, and date of testing.

Applications

ISO 787-10:1993’s pyknometer method is essential for:

• Quality Control in Manufacturing
  Used by manufacturers of pigments, extenders, paints, and coatings to ensure material consistency and compliance with industry specifications.
• Research and Development
  Facilitates comparison of new pigment formulations and extenders, enabling optimization of product performance.
• Specification and Supply Agreements
  Provides a recognized reference in contracts and technical data sheets, supporting clear communication of required properties.
• Regulatory Compliance
  Supports adherence to industry regulations and quality benchmarks across different countries and organizations.

Industries using this standard include:

• Paints and coatings
• Plastics and polymers
• Construction materials
• Printing inks
• Ceramics and specialty chemical sectors

Related Standards

The ISO 787 series covers a wide range of general test methods for pigments and extenders. Related parts include:

• ISO 787-1: Comparison of colour of pigments
• ISO 787-2: Determination of matter volatile at 105°C
• ISO 787-4: Determination of acidity or alkalinity of the aqueous extract
• ISO 787-11: Determination of tamped volume and apparent density after tamping
• ISO 787-23: Determination of density (using a centrifuge to remove entrained air)

Other referenced standards:

• ISO 842: Raw materials for paints and varnishes - Sampling
• ISO 565: Test sieves - Nominal sizes of openings

Adhering to ISO 787-10:1993 ensures reliable pigment and extender density testing, supporting consistency, quality, and global trade in pigments and related industries.