The NFPA or HMIS labels, or something from another "competent authority" are for workplace containers you transfer chemicals to.  But you're right, you don't need that if you're using the original distributor's labeling. 

In my opinion the NFPA and HMIS labels are basically a courtesy for fire fighters.    

One problem with just using those pictogram placards is you still have to be careful about the corrosives, because it doesn't distinguish between acids and bases - or even that DOT quarter-inch steel corrosive definition that has nothing to do with pH.  So if somebody's not careful and sorts chemicals solely based on the pictograms, they just might put all the acids and bases in the same cabinet.  So you have to make sure everybody in the lab understands that, and exactly what those chemicals are that they're dealing with. 

Eric

Eric Clark, MS, CHMM, CCHO

Safety Officer, Public Health Scientist III

Los Angeles County Public Health Laboratory