blasting effect 1

Initial and final conditions of new steel – significance

Four grades of initial surface condition

Four grades of final finishes (defined by SSPC)

 

“A“ – Steel surface covered completely with adherent mil  scale: little

or no rust visible (SSPC-Vis-1 – Rust Grade A)

“B“ – Steel surface completely covered with both mil  scale and rust

(SSPC-Vis-1 – Rust Grade B)

“C“ – Steel surface completely covered with rust; little or no pitting

visible (SSPC-Vis-1 – Rust Grade C)

“D“ – Steel surface completely covered with rust; pitting visible (SSPC-Vis-1 – Rust Grade D)

 

“A“ – Steel surface covered completely with adherent mil scale: little or no rust visible (SSPC-Vis-1 –Rust Grade A)

These are the TWO levels of surface preparation recognized by SSPC in(SSPC-Vis-1 – Rust Grade A):  SP 5 (White Metal)、SP 10 (Near White)

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  • SSPC VIS 1, Guide & Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast Cleaning.
  • “B“ – Steel surface completely covered with both mil  scale and rust(SSPC-Vis-1 – Rust Grade B)

These are the FOUR levels of surface preparation recognized by SSPC(SSPC-Vis-1 – Rust Grade B): SP 5 (White Metal)、SP 10 (Near White)、SP 10 (Commercial) 、SP 7 (Brush) .

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  • “C“ – Steel surface completely covered with rust; little or not pitting visible (SSPC-Vis-89 – Rust Grade C)
  • These are the FOUR levels of surface preparation recognized by SSPC (SSPC-Vis-89 – Rust Grade C) : SP 5 (White Metal)、SP 10 (Near White) 、 SP 10 (Commercial)、SP 7 (Brush)

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  • “D“ – Steel surface completely covered with rust; pitting visible(SSPC-Vis-89 – Rust Grade D)

These are the FOUR levels of surface preparation recognized by SSPC(SSPC-Vis-89 – Rust Grade D): SP 5 (White Metal) 、SP 10 (Near White)、SP 10 (Commercial)、SP 7 (Brush)

blast effect 4

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