The Anti-sag applicators are designed to assess paint sag in compliance with ASTM methods D3730 and D4400.
a series of 1/4 inch wide notches of varying clearances, spaced 1/16 inch apart
The bar is 5 inches wide and produces a total film width of 3 3/8 inches
When a drawdown is made, a series of parallel stripes of different wet film thickness will be formed. This panel is placed on a vertical surface with the stripes horizontal and the thickest stripe lowest. As the film stripes sag downward, some of the uncoated 1/16 inch (1.6 mm) spaces may become entirely covered. The clearance of the gap that produces the thickest film stripe, not sagging completely to the stripe below, is the anti-sag index of the coating.