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You can purchase the ASTM D823 standard from the ASTM International website or obtain a copy from a document provider like IHS Markit or ANSI. Here's a useful piece of information: You're looking
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. astm d823 pdf
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.