ASTM D2472

Component	ASTM 2472 D	IEC 376	ASG TYPICAL
Sulfur Hexafluoride (by wt.)	99.8%	99.9%	³ 99.99%
Water (vol. %)	£ 8 ppmv	£ 15 ppmv	£ 1 ppmv
Dew Point	-62°C	-40°C	-85°C
Acidiy (HF)	£ 0.3 ppmw	£ 0.3 ppmw	£ 0.3 ppmw
Hydrolizable Fluorides	- - - - -	£ 1.0 ppmw	- - - - -
Air (wt. %)	£ 500 ppmw	£ 500 ppmw	£ 200 ppmw
Carbon Tetrafluoride (CF4)	£ 500 ppmw	£ 500 ppmw	£ 200 ppmw