The minimum amount of paint used to paint evenly on the surface of an object so that the base color no longer appears is called hiding power. Expressed in grams per square meter.
The current method of testing hiding power in our country is to use the weight per unit area method - the black and white grid method. That is to say, paint the sample evenly on a 100 mm x 200 mm black and white grid glass plate. Under scattered light or in the specified light source equipment, visually observe until the black and white grid is just invisible, and calculate the amount of paint used. The formula for calculating the hiding power X (grams per square meter) is:
W1: the total weight (grams) of the paint cup and the paint before painting;
W2: The total weight (grams) of the cup and paint filled with remaining paint after painting;
S: The painted area of the black and white grid board (square centimeters).
