surface finishes term shall apply to interior surface finishes accessible and inaccessible directly indirectly

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Surface Finishes
This term shall apply to all interior surface finishes accessible and inaccessible, that directly or indirectly come in contact with the designated product in bioprocessing equipment and distribution system components (ASME BPEa-2000). Final criteria shall be determined by Ra values rather than polishing methods.

For Piping, Tubing, and Fittings:

1. As fabricated

2. Pickled and/or passivated

3. Bright hydrogen annealed

4. Mechanically polished

5. Mechanically buffed

6. Chemically polished

7. Electropolished

For Sheet, Strip, and Plate:

1. As fabricated. Without any specific surface treatments.

2. Rolled Finish. Manufactured by either hot or cold rolled process.

3. No. 1. A dull, hot rolled finish, annealed and pickled.

4. No. 2D. A dull, cold rolled finish, annealed and pickled.

5. No. 2B. A bright, cold rolled finish, annealed and pickled.

6. No. 4. A general purpose polished finish widely used for architectural panels, trim, and sanitary equipment. Following initial grinding with coarse abrasives, the surface is finally finished with lubricated 150 grit abrasive belts.

7. No. 4S. Processed as No. 4 except the final surface is polished to a smother finish. The purchaser must specify this alternative finish; the specification must state a No. 4 finish, using a 240 or 320 grit mechanical polish, whose particular surface roughness must meet the specified Ra value.

8. No. 6. A dull finish having a lower reflectivity than No. 4. It is produced by a tampico brushing in a medium of abrasive and oil and is used primarily for architectural applications.

9. No. 7. A finish with a high degree of reflectivity, produced by buffing to a finely ground surface without removing the grit lines.

10. No. 8. The most reflective finish, obtained by polishing with successively finer abrasives and buffing extensively with very fine buffing rouges. This finish is most widely used for press plates, mirrors, etc.

For Wrought and Cast Forgings:

1. As fabricated or machined

2. Mechanically ground, polished, or buffed

3. Abrasive blast cleaned, using one of the following methods:

a. Sand blast

b. Shot blast

c. Glass blast

d. Wet blast

4. Slurry polished

5. Roll deburred

6. Chemically cleaned

a. Acid washed (pickled and passivated)

b. Solvent washed

7. Electropolished