{"id":23627,"date":"2018-12-06T11:30:30","date_gmt":"2018-12-06T11:30:30","guid":{"rendered":"https:\/\/staging.www.hodgeclemco.co.uk\/?page_id=23627"},"modified":"2022-12-20T08:45:04","modified_gmt":"2022-12-20T08:45:04","slug":"standards-of-surface-finish-chart","status":"publish","type":"page","link":"https:\/\/www.hodgeclemco.co.uk\/inspection\/standards-of-surface-finish-chart\/","title":{"rendered":"Standards of Surface Finish Chart"},"content":{"rendered":"

[vc_row remove_padding=”no-padding-vc-row”][vc_column width=”1\/2″][vc_column_text]<\/p>\n

Standards of Surface Finish Chart<\/h1>\n

 <\/p>\n

Standards of Surface Finish Chart – The surface under examination is visually compared with high quality photographs in the ISO 8501-1 standard both before and after blasting. This section of the standard is pictorial and show rust grades prior to blasting and the degree of surface cleanliness afterwards. The preparation is then given a coding, e.g. SA2\u00bd which is interpreted using the Standards Wall Chart.<\/p>\n

 <\/p>\n

Surface finish from abrasive blasting<\/h2>\n

This depends upon the initial surface condition as well as the operation of abrasive blasting and the abrasive size, hardness and shape.<\/p>\n

Initial surface condition of steel<\/h2>\n

These can be categorised as:
\nRust Grade A
\nSteel which is completely covered by mill steel.
\nRust Grade B
\nSteel where mill scale has started to flake and light rusting occurs.
\nRust Grade C
\nSteel where all mill scale has flaked off and complete rusting has taken place.
\nRust Grade D<\/p>\n

Steel where pitting and complete rusting has occured.
\nSurface cleanliness is catergorised into four grades.
\nBrush-Off
\nCommercial
\nNear-White Metal
\nWhite Metal<\/p>\n

Another surface quality is roughness or profile. This is the etched surface or “tooth” obtained by abrasive striking the metal.<\/p>\n

Surface profile affects the ability of the surface to allow protective coatings to adhere. It is important that the surface roughness be sufficient for good paint adhesion.<\/p>\n

Surface profile can be measured by several field methods. The best method of ensuring a specific profile is to specify the type and size of abrasive to be used for blasting.<\/p>\n

Degree of surface cleanliness and specific profile on any job are established by the coatings of the manufacturer.<\/p>\n

Once abrasive blasting needs are defined, equipment can be selected, personnel trained and procedures initiated.<\/p>\n

Equipment used for surface preparation must be efficient, dependable, and easy to operate. Information for training and operation must be accurate and up-to-date.<\/p>\n

 <\/p>\n

For further information see our\u00a0Inspection and Testing Equipment brochure<\/a>[\/vc_column_text][\/vc_column][vc_column width=”1\/2″][vc_single_image image=”24665″ img_size=”large”][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]For more information on our range of products view our\u00a0product catalogue<\/a>.<\/p>\n

See the full selection of our abrasive materials in our\u00a0abrasives brochure<\/a>.<\/p>\n

Watch our product videos on our\u00a0YouTube channel<\/a>.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

[vc_row remove_padding=”no-padding-vc-row”][vc_column width=”1\/2″][vc_column_text] Standards of Surface Finish Chart   Standards of Surface Finish Chart – The surface under examination is visually compared with high quality photographs in the ISO 8501-1 standard both before and after blasting. 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