ISO 3601-3:1987

This part of ISO 3601 defines and classifies surface imperfections on O-rings and specifies maximum acceptable limits for these imperfections, and it is also applicable to O-rings to be used in aerospace construction. Gives quality grades and definitions, and the table contains categories of surface imperfections together with schematic illustrations of these imperfections. An annex gives examples of surface imperfections (figures 1 to 8).