dasvig - 5/11/2009 08:20 You need to check what comes AFTER those concentrations to see what's the same. Glyphosate is an acid. To be formulated for use, it is combined with a base. In the US, this base is almost always either IPA (isopropylamine) or K (potassium hydroxide). The salt is heavier than the acid. When you read a concentration, you may see the following a.e. (acid equivalent - a measure of how much actual glyphosate acid is in the product) a.i. (active ingredient - this is a measure of the salt) wt.% (usually the salt) For IPA salt (typical) 356g/l a.e. = 480g/l a.i. = 41% wt. IPA salt of glyphosate FOR K Salt (typical) 540g/l a.e. = 660g/l a.i. = 48.8% wt. K salt of glyphosate