Overview
ASTM D268-22 - Standard Guide for Sampling and Testing Volatile Solvents and Chemical Intermediates for Use in Paint and Related Coatings and Material - provides procedures and referenced methods for the proper sampling and testing of volatile solvents. These solvents are essential raw materials in the manufacture of paint, lacquer, varnish, and similar surface coatings. The standard includes guidance on selecting the most appropriate testing method when multiple options exist, as well as pointers to best practices for sampling and analysis to ensure reliable results.
Accurate sampling and testing are crucial in the coatings industry to ensure product quality, compliance with specifications, safety, and optimal performance of end products. The standard was developed following internationally recognized principles on standardization, supporting global trade and regulatory acceptance.
Key Topics
- Sampling Procedures: Guidance on obtaining representative samples of liquid solvents, emphasizing the importance of using standardized practices (such as ASTM E300) to secure reliable test results.
- Test Method Selection: Discussion of available ASTM test methods for key properties of solvents, including:
- Specific gravity and density
- Color (Platinum-Cobalt, Saybolt, APHA)
- Distillation range
- Flash point (several test methods, both open and closed cup)
- Acidity and alkalinity
- Odor and nonvolatile residue
- Water content (Karl Fischer, turbidity)
- Hydrogen sulfide and sulfur dioxide content
- Purity of ketones and esters
- Solvent power evaluation (aniline point, kauri-butanol value, dilution ratio)
- Significance of Testing: Each method includes a brief explanation to help users identify the most applicable procedure for their specific solvent and application.
Safety note: Users must consult individual safety data sheets (SDS) from suppliers and establish proper health, safety, and environmental procedures before working with volatile solvents and chemical intermediates.
Applications
ASTM D268-22 is widely used in industries involving paint and coatings, including:
- Manufacturers of Paints, Lacquers, and Varnishes: Ensuring solvents and intermediates meet specifications for optimal curing, film formation, and durability.
- Quality Control Laboratories: Implementing consistent sampling and testing protocols for raw material validation, batch release, and regulatory compliance.
- Suppliers and Distributors of Solvents: Providing evidence of product quality and conformity with customer and regulatory standards.
- Procurement/Technical Buyers: Comparing material data to specifications listed using standard test results as benchmarks.
- R&D and Formulation: Assessing solvent performance and compatibility in new formula development or when sourcing alternative materials.
Commonly tested materials under this standard include mineral spirits, acetone, turpentine, aromatic hydrocarbons, and various chemical intermediates relevant to coatings.
Related Standards
For comprehensive solvent characterization, ASTM D268-22 references numerous related standards, including but not limited to:
- ASTM E300 - Practice for Sampling Industrial Chemicals
- ASTM D86, D1078, D850 - Distillation of Petroleum Products and Solvents
- ASTM D93, D56, D1310, D3278 - Flash Point Determinations
- ASTM D1209, D156 - Color Measurement
- ASTM D891, D3505 - Specific Gravity and Density
- ASTM D847, D848, D849, D853 - Acidity, Corrosiveness, and Sulfur Content Tests
- ASTM D1353, D1363, D1720, D1722 - Nonvolatile Matter, Reducing Substances, Dilution, Water Miscibility
Referencing these standards in conjunction ensures reliable, industry-accepted results and facilitates international communication on solvent quality.
Keywords: ASTM D268-22, volatile solvents, solvent testing, sampling solvents, paint solvents, coatings, quality control, industrial chemicals.