The Sag Index Applicator is especially designed for sag resistance evaluation. The total film width of 90mm is equally divided into 10 gaps, incremented in depths of 25µm. The space between each gap is 1.5mm.
The application of the coating is the same as for standard bar applicators, but afterwards the test panel is lifted and turned to be at 90 degrees to the horizontal, preferably with the thickest coating positioned at the bottom of the sample.
The sag index can be determined by the first track that does not show signs of sagging onto the next track below.
The TQC Sheen Sag Index Applicator has removable guidance plates. This guidance plate guarantees straight draw downs on glass panels or thicker test panels