ASTM D823

ASTM D823-18 is the current standard test method for producing films of uniform thickness of paint, varnish, and related products on test panels. It is used to ensure that the test panels have a consistent surface finish, which is important for obtaining accurate results from other tests.

The test method involves applying the paint, coating, or related product to a test panel using a variety of techniques, such as brushing, spraying, or dipping. The thickness of the film is then measured using a variety of instruments, such as a wet film gauge or a dry film gauge.

The following is a simplified overview of the test procedure:

Select a test panel that is clean, dry, and free of defects.
Prepare the test panel by sanding it lightly and wiping it with a solvent to remove any dirt or grease.
Select a coating application method and apply the paint, coating, or related product to the test panel according to the manufacturer’s instructions.
Measure the thickness of the wet film using a wet film gauge.
Allow the film to dry completely.
Measure the thickness of the dry film using a dry film gauge.
The test method also includes a number of procedures for troubleshooting problems with the coating application process or with the measurement of the film thickness.

The following are some of the factors that can affect the results of the test:

The type and amount of paint, coating, or related product used
The coating application method used
The temperature and humidity of the environment
The thickness of the test panel
The accuracy of the film thickness gauge
It is important to follow the test procedure carefully to ensure that the results are accurate and reproducible.

ASTM D823-18 is a widely used test method in the paint and coatings industry. It is used by manufacturers, suppliers, and customers to ensure that the quality of paint, coatings, and related products meets the required specifications.

Here are some examples of how ASTM D823-18 is used:

A paint manufacturer uses the test method to ensure that the thickness of the paint film is consistent from batch to batch.
A coatings supplier uses the test method to ensure that the thickness of the coating film meets the customer’s specifications.
A customer uses the test method to ensure that the thickness of the paint or coating film on their product meets the required standards.
ASTM D823-18 is an important test method for ensuring the quality of paint, coatings, and related products. It is a widely used test method in the industry, and it is important for all stakeholders to understand the test procedure and the factors that can affect the results.