Newsgroups: rec.pyrotechnics
From: tip@mercury.aichem.arizona.edu (Tom Perigrin)
Subject: Re: Chemical grades
Date: Mon, 4 Mar 1996 14:29:50 GMT

In article <313abdc5.4195281@nntp.iprolink.co.nz>, matth@iprolink.co.nz
(Matt) wrote:

> Could someone please explain the different grades of chemicals. ie,
> reagent grade, laboratory grade, technical grade etc.


spectral quality - man, you don't wanna ask...

analytical reagent - very high grade, probably with an analysis on each
bottle

reagent - very high grade, possibly an analysis, possibly a typical
analysis

laboratory grade - good grade.  Slightly higher level of impurity, although
controlled as to type of impurity

technical grade - good for a purpose.  The impurities are controlled such
that they will not interfere with the intended process.  For example, tech
grade chemicals for ceramic glazes won't contain agent which would give
off-color glazes, but may contain substantial amounts of agents which don't
affect color quality...


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