woelen - 25-10-2006 at 00:14
I purchased some chemicals from a UK-based seller. Some of these chems are marked as "LR grade", and some others as "AR grade". I have an idea of what
these are, but this only is a vague idea, I would like to know a precise definition of these.
What is the precise meaning of these grades? Are they about how the chemicals can be used, or are they absolute meaasures of the maximum amount of
impurity in the chemicals?
YT2095 - 25-10-2006 at 00:29
LR =Lab reagent AR=Analytical reagent, take a look here also: http://www.chemicals-technology.com/contractors/laboratories...
The_Davster - 28-10-2006 at 16:40
What my text states, is that LR, laboratory reagent, usually is of no less purity than 99%, wheras AR, analytical reagent, is upwards of 99%.
AR grade in my opinion is of no use to the home-chemist, unless you have an analytical obsession and like titrating stuff down to 4 sugnificant
digits.