All "yards" as in the yards on a roll, is linear yards and not square yards.
Style 2532 fiberglasss cloth is a plain open weave similar to Style 7532 having the same approximate weight (7 oz/sq yd), thread count and thickness. The difference between style 7532 and 2532 is that Style 2532 uses one flat yarn with a 10 micron diameter glass filament where 7532 uses three 1/3 size 9 micron glass filaments yarn in its construction. Style 2532 is in effect a flatter and slightly firmer cloth than style 7532. We just have a few rolls of the style 2532 available.