Birtley Galvanizing Birtley Galvanizing 2018 .compressed | Page 7

07 B IR TLEY GALVANIZING | S HOT B L AS TING SHOT BLASTING Shot blasting enhances the microscopic surface profile of metal so that it holds a coating even more effectively as it increases zinc deposition. A package of shot blasting and galvanization from Birtley Galvanizing will maximise the rust-free life of any piece being treated. Our on site cabinet blasters have capacity for shotblasting smaller articles. Shotblasting will remove contaminants prior to galvanizing and will increase the surface profile of the base metal to achieve a heavier galvanized coating, thus increasing corrosion protection. There are several national and international standards which define the visual assessment of surface cleanliness of steel before application of paint and related products. The equivalence of the standards is summarised in the following table: White Metal ISO 8501-1 (1988) Near White Commercial Metal Blast Brush-Off Blast Sa3 Sa2.5 Sa2 Sa1 Sa3 Sa2.5 Sa2 Sa1 SSPC (1982) SP5 SP10 SP6 SP7 NACE SP1 SP2 SP3 SP4 BS7079:A1 (1988) Swedish Standard SIS055900 (1967)