What does astm f2413 05 175c75 mean?

f2413-05 has something to do with chain saw protection. and I think 175/c75 is some kind of osha requirement for safety footwear?

F2413 is the ASTM designation for footwear protection standards for work boots. The "-05" signifies the 2005 version which was updated in 2011 and is signified with "-11" suffix. The last part "I75" (not 175) and "C75" designate (I)mpact resistance of 75 ft lbs and (C)ompression resistance of 75 ft lbs (there are boots that only resist 50 ft lbs also that would bear the designation I50 C50). There are further designations for various other properties. . .EH = Electrical isolation to help prevent electrocution. .CD - Conductive (i.e., it allows electrical grounding) for use in potentially explosive environments (where gases, explosives and volatile chemicals are present). .SD = Static Dissipative (kind of a combination of EH & CD). .PR = Puncture Resistant. .CS - Chain Saw resistant. .DI = Dielectric (a higher grade EH, I believe).