The scratch resistance test measures the force needed to engrave a surface (Newton measurement unit). The greater the force required, the better the resistance of the surface.
The light fastness test measures the color variation of the surface exposed to artificial light. It uses a scale from 1 to 5, where 5 indicates maximum resistance.
The surface hardness test measures the resistance of the coated surface to scratch with a pencil. The higher the hardness of the pencil, the greater the resistance of the surface (the maximum hardness of a pencil is 9H and the lesser is 9B).
The resistance test to cold liquids measures the degree of resistance of the coated surface to stains caused by selected liquids. It uses a scale from A to D, where A indicates the maximum resistance.