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)