Usually packed in drums. If these arrive damaged, the phosphoric anhydride will rapidly absorb moisture from the air, thus forming meta, pyro or ortho-phosphoric acid, depending upon the amount of water absorbed and upon the conditions under which absorption takes place. In this condition, the phosphoric anhydride will be valueless as a drying agent, but can be used in the manufacture of phosphoric acid. See also IMDG Code & US CFR.
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