The BGD 225 Sagging Testers are in accordance with the specification of ASTM D 4400 and ASTM D 3730. They are made of corrosion resistance stainless steel. The width of the application is 75 mm at 6 mm sagging thickness, the gaps are being separated by a 1 mm space as a marking on each sagging for distinctive identification of each test.
The sagging testers are applicable to determine the relative sag resistance of a series of paints in order to provide the technical parameters for the paint application.
ASTM D 4400
ASTM D 3730
Drawdown the coatings on a material (glass, test chart or board) using the appropriates sagging Thickness Gauges, then place the coated material at vertical position (90º) to the platform (eg: table). Allow 10 to 30 minutes (depending on the viscosity) for the coatings to sag under gravity. Check out the coating thickness without the sagging effect and the next coating thickness with the sagging effect. With that information, the recommended coating thickness is between the 2 layers of coatings.