Standard phosphate coatings on the fixing elements are mat of dark gray to black colour. Typical phosphate coatings on fasteners are matte, with colours ranging from dark grey to black. Phosphate coatings have anti-corrosion properties and additionally increase the adhesion of applied paint coatings. Phosphating is performed for drywall screws (coarse and fine thread, self-drilling).
The specific use of these products excludes the use of zinc coatings which are easily damaged by contact with gypsum. Phosphate coatings not only protect products against corrosion but also reduce friction coefficient and make installation easier.
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