So I’ve been updating my chemical inventory spreadsheet to add an SDS link and a quick NFPA reference column. Anyway, I noticed somewhere around the
c’s that different SDS’s can give different NFPA ratings for the same chemical. This really started to bother me by the time I got to the m’s -
just for example: The first SDS I found is for Mg metal turnings and ribbon, >90% and lists the NFPA info as Health:0, Fire:1, Reactivity:1, and No
Water, the next is for Mg Ribbon >99%, and lists it as 1,1,1 no water and the last one is for Mg turnings >90% and lists it as 2,3,2 no water!
Considering the scale is only 0 to 4, the difference between 0 and 2 or 1 and 3 is huge. What’s the deal? This keeps coming up again and again. How
does one decide which to use? Do you just go with the most conservative rating and call it a day or what? |