O-Ring Cord Tolerances (RMA / ARPM E1, E2, E3)

Cross-sectional tolerance for extruded O-Ring cord: the RMA/ARPM Table 13 and ISO 3302-1 classes E1, E2 and E3 in inch and millimeter, how cord compares to a molded O-Ring, how material and durometer change what a mill can hold, plus sponge and cut length tables.