Prepainted Steel Sheets – Category and Film Thickness of Primers

2020年9月15日关作者 powerson metal

Prepainted Steel Sheets - Category and film thickness of primers

The caregory of the primer includes epoxy, polyester, acrylic acid, polyurethane, etc. In general, the primer is chosen in accordance with the usage, environment condition, processing stage and finish coat. The film thickness of the primer is usually 5-7 um.

A. Epoxy Primer

The epoxy primer has a strong adhesion to the base metal and good properties in waterproof, alkali-proof and chemical resistance, which is the original primer for the coiled steel, having a poorer flexibility than that of other primers.

B. Polyester primer

The primer has strong adhesion to the base metal and excellent flexibility. which is relatively sensitive to damp environment and has a chemical resistance poorer than that of epoxy primer.