4 Coating requirements4.1 Requirements for the coatings materialThe zinc or zinc alloy used for the coating shall comply with the standard EN 1179. For zinc-alloy grades not mentioned in the EN the alloy shall be specified at the enquiry and order. For Zn95Ai5 reference is made to ASTM B 750 with or without mischmetall (MM).The ingot of the material used for the zinc coating shall be of minimum 99,9 % purity uniess otherwise stated in the relevant product standard or other specification in the order. Coatings applied by electrolysis shall contain a minimum of 99 % zinc.