ISO 16862 describes test methods for evaluating the sag resistance of paints, varnishes and similar coating materials (coatings) when applied to a substrate and held in a vertical position.
Evaluation of sag resistance can be done after the coating has been applied as follows:
A pre-shear program is required for a tensile sag test to replicate the deterioration in structure that occurs when thixotropic paints are applied by brush or another practical application method. The procedure therefore includes preliminary cutting of paints just before application. The rotation speed and mixing time will be decided by the interested parties.
The wet film thickness obtained with the application is smaller than the cavity depth of the applicator depending on the viscosity, rheology and application speed. Therefore, the actual wet film thickness applied must be determined and recorded with the largest non-sagging void size.
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