Description

This standard is an international standard on paints and varnishes which covers the determination of film thickness. 

It describes methods for measuring the thickness of coatings applied to a substrate. Methods for determining wet-film thickness, dry-film thickness and the film thickness of uncured powder layers are described. 

For each method described, this Standard provides an overview of the field of application, existing standards and the precision. 

Scope

Paint is any pigmented liquid, liquefiable, or solid mastic composition that, after application to a substrate in a thin layer, converts to a solid film. It is most commonly used to protect, color, or provide texture to objects. 

Varnish is a clear transparent hard protective coating or film. It is not a stain. It usually has a yellowish shade from the manufacturing process and materials used, but it may also be pigmented as desired, and is sold commercially in various shades. 

Film thickness is the depth of the coating applied. Film thickness can be broadly classified as: Wet film thickness - Wet film thickness (WFT) is the thickness of wet paint or any coating film that is liquid-based. Wet thickness is at its peak right after the application of the coating 

This Standard consistently enumerates the individual coatings applied in a multi-layer system by referring to the first coating applied on the substrate as coating 1. Some other standards referring to individual test methods enumerate in reverse order.