ASTM D476-15(2021) PDF

Overview

ASTM D476-15(2021): Standard Classification for Dry Pigmentary Titanium Dioxide Products provides essential guidance on classifying eight different types of dry pigmentary titanium dioxide (TiO₂) pigments. Developed and published by ASTM International, this standard focuses exclusively on dry, hiding pigments for coating applications and does not cover dispersions or non-hiding specialty titanium dioxide products.

The standard assists manufacturers, buyers, and formulators in determining the most suitable titanium dioxide pigment for their specific paint, coating, or related materials. Its adoption helps ensure consistent quality and performance in coatings, aligning with recognized international practices.

Key Topics

• Classification of Pigment Types: The standard defines eight distinct types of pigmentary titanium dioxide, primarily categorized by crystal structure (anatase or rutile), composition, and typical end use.
• Properties and Performance Criteria:
  • Minimum TiO₂ content
  • Specific gravity range
  • Moisture content limitations
  • Chalking resistance (important for exterior durability)
  • Content of water-soluble salts
  • Maximum residue on 45-micron screen
• Test Methods: References several ASTM methods used to assess chemical properties, specific gravity, moisture content, coarse particles, and composition.
• Basis for Classification: Outlines major differentiating properties to help users select the most appropriate titanium dioxide pigment based on performance and application needs.
• Agreement on Additional Properties: Stipulates that other product characteristics may be specified and agreed upon by the purchaser and seller as required.

Applications

• Paint and Coatings Industry: The principal application of this standard is in selecting pigmentary titanium dioxide for formulating paints and coatings. Depending on the required characteristics-such as exterior durability, chalking resistance, and gloss-manufacturers can choose a suitable pigment type (e.g., high gloss for interior or high-durability for exterior paints).
• Polymer Compounds: Some pigment types addressed by the standard are used in coloring or opacifying plastics and polymers, especially where exterior durability and infrared reflectance are required.
• Quality Assurance and Procurement: The classification system aids procurement professionals, formulators, and quality assurance teams in tender specifications, supplier comparison, and verification of pigment fitness for intended use.
• Industry Compliance: Aligning with ASTM D476-15(2021) supports compliance with international best practices and regulatory requirements, facilitating global trade, and enhancing product credibility.

Related Standards

• ASTM D34 - Guide for Chemical Analysis of White Pigments
• ASTM D153 - Test Methods for Specific Gravity of Pigments
• ASTM D185 - Test Methods for Coarse Particles in Pigments
• ASTM D280 - Test Methods for Hygroscopic Moisture in Pigments
• ASTM D1394 - Test Methods for Chemical Analysis of White Titanium Pigments
• ASTM D2448 - Test Method for Water-Soluble Salts in Pigments
• ASTM D3720 - Test Method for Ratio of Anatase to Rutile in Titanium Dioxide Pigments by X-Ray Diffraction

Practical Value

Adhering to ASTM D476-15(2021) ensures that paint and coating manufacturers select the proper type of titanium dioxide pigment, resulting in products with consistent color, opacity, and weather resistance. This standard also streamlines quality control, supports effective procurement, and underpins regulatory compliance in all markets where titanium dioxide pigments are used for coatings and related applications.

Keywords: ASTM D476, titanium dioxide pigment classification, rutile, anatase, paint pigment standard, pigment properties, pigment testing, coating applications, ASTM pigment standards, quality assurance in coatings