Wet scrub resistance is a standard way of measuring how well a paint stands up to cleaning once it’s dry. It's tested using ISO 11998 and classified under EN 13300.
In the ISO 11998 test, a painted surface is repeatedly scrubbed with a wet brush. The less paint that wears away, the higher the class.
Higher class (IE class 1) = more durable and easier to clean.
Lower class (IE class 5) = more delicate finish, better left unscrubbed.
It helps you choose the right paint for how a room is actually used, not just how it looks.
Wet Scrub Resistance Classes
Class 1 - Very durable - Highly wipeable. Designed for frequent cleaning and scrubbing.
Class 2 - Washable - Suitable for light cleaning with a damp cloth. Good everyday durability.
Class 3 - Limited cleaning - Can handle occasional wiping, but marks may remain.
Class 4 - Very limited - Not really washable. Best left alone once dry.
Class 5 - Not washable - Decorative only. Will mark or wear if wiped.
Wet scrub resistance tells you how well a painted surface stands up to repeated cleaning.
It is useful for comparing wall paints, because it shows whether a paint can be wiped or scrubbed without the finish wearing away too quickly.
More: Paint washability & scrubbability
