This standard practice provides a detailed guide on how to prepare paint films of uniform thickness on test panels. The method involves the use of a draw-down bar or a similar device to apply a uniform film of paint to a test panel.
The standard is divided into five distinct methods for applying coatings. Each method is designed to minimize human error and provide a high degree of reproducibility. astm d823 pdf
ASTM D823 is a standard test method developed by the American Society for Testing and Materials (ASTM) that covers the preparation of uniform thickness of paint, varnish, and related coatings on test panels. This standard practice provides a detailed guide on
Please note that you may need to purchase or subscribe to access the full PDF version of the standard. Each method is designed to minimize human error
ASTM D823 is a widely used standard practice for preparing and using two-part epoxy and polyurethane adhesive binders. The standard provides guidelines for mixing, applying, and curing these adhesives for various applications.
ASTM D823 is a standard practice for producing films of uniform thickness of paint, coatings, and related products on test panels. It provides five different methods for applying these coatings to ensure consistent results during testing. Core Content of ASTM D823 The standard is divided into five specific methods for coating application: Method A: Automatic Spray Machine Uses a mechanical spray gun moved at a constant speed across a panel. This is the most reproducible method for spray-applied coatings. Method B: Motor-Driven Dip Coater Involves immersing a panel in a coating and withdrawing it at a constant, controlled speed. The thickness is determined by the withdrawal rate and the coating's viscosity. Method C: Motor-Driven Blade Film Applicator Uses a "doctor blade" or drawdown bar moved by a mechanical device. Eliminates human error in speed and pressure compared to manual drawdowns. Method D: Motor-Driven Spinning Disk (Centrifugal) A panel is attached to a rotating disk, and a measured amount of coating is applied to the center. Centrifugal force spreads the liquid to create a thin, uniform film. Method E: Hand-Held Blade Film Applicator The manual version of Method C, using hand-held drawdown bars. While common, it is considered less precise than the motor-driven methods. Why This Standard Matters In coating technology, properties like color, gloss, drying time, and chemical resistance are highly dependent on
This guide provides a general overview of ASTM D823 and should not be considered a substitute for the actual standard or manufacturer's instructions. It is essential to consult the standard and manufacturer's guidelines for specific applications and to ensure compliance with relevant regulations and safety standards.