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Surface Finish: TABLE SF-1 Acceptance Criteria for stainless Steel and higher Alloy
                                     Mechanically Polished Product Contact Surface Finishes
Anomaly or Indication

Acceptance Criteria

pits If diameter < 0.020 in. and bottom is shiny. Pits <0.003 in. diameter are irrelevant
  and acceptable.
Cluster of pits No more than 4 pits per each 1/2 in. X 1/2 in. inspection window. The
  cumulative total of all relevant pits shall not exceed 0.040 in.
Dents None accepted.
Finishing marks If Ra max. is met.
Welds As welded shall meet requirements of MJ-6. If welds are finished, then shall be
  smooth and blended.
Nicks None accepted.
Scratches  For tubing, if cumulative length is <12.0 in. per 20 ft tube length or prorated and if
  depth is <0.003 in.
  For fittings, valves, and other process components, if length is <0.25 in
  cumulatively, depth <0.003 in. and Ramax. is met.
  For vessels, if length < 0.50 in. at 0.003 depth and if <3 per inspection window.
Surface cracks None accepted.
Surface inclusions If Ra max. is met.
Surface residuals None accepted, visual inspection.
Surface roughness (Ra) See Table SF-3.
Weld slag For tubing, up to 3 per 20 ft length or prorated, if<75% of the width of the weld bead.
  For fittings, valves, vessels, and other process components, none accepted (as
  welded shall meet the requirements of MJ-6 and Table Mj-3)
Porosity None open to the surface.

Table SF-3 Ra Readings For Product Contact Surfaces


(a) ALL Ra readings are taken across the lay,

wherever possible.

(b) No single Ra reading shall exceed the Ra

Ra max. value in this table.

(c) Other Ra readings are available if agreed

upon between owner/user and manufacturer,

not to exceed values in this table.


(1) Or any other finishing method that meets

the Ra max.

 is designed to the highest standards for Pharmaceutical, Bio-Tech, Semiconductor, Vacuum, Drinking Water.

Grit: Measures the number of scratches per linear inch of

abrasive pad. Higher numbers indicate a smoother


RMS: Defined as Root Mean Square roughness, this method

measures a sample for peaks and valleys. Lower

numbers indicate a smoother finish.

Ra: Known as the Arithmetic Mean, this measurement

represents the average value of all peaks and valleys.

Lower numbers indicate a smooth finish.

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