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I don't think so.poly phosphoric acid and phosphoric acid have same moleculer structure.http://harvestchem.iblogger.org
phosphoric acid
H3PO4 is the formula for phosphoric acid, also called orthophosphoric acid. For details see: http://en.wikipedia.org/wiki/Phosphoric_acid
Phosphoric acid
Phosphoric acid 85% is the highest purity of this type of acid available in the market. Which is most used in food grade. Phosphoric acid is in the classification of weak acids.