Which ASTM standard covers the preparation of dried paint samples for laboratory analysis?

• A. ASTM E 1645
• B. ASTM E 1729
• C. ASTM E 1979-98
• D. ASTM E 1775-96

Answer: (B)

Preparing dried paint samples for laboratory analysis requires a standardized procedure to ensure consistent, comparable results. ASTM E 1729 provides the guidance for how to prepare dried paint samples, including collecting paint chips or flakes, drying under controlled conditions to a moisture-free state, and handling the material to minimize contamination before analysis. This ensures the sample entering the lab is uniform and representative of the material on the surface, which is essential for reliable analytical results, whether the lab uses digestion, spectroscopy, or microscopic examination. Other standards address related steps such as field sampling, the analytical methods used once a sample is prepared, or general testing requirements, but not the specific preparation of dried paint samples for analysis.