sodium phosphate glass
noun
: any of various usually water-soluble glassy substances that in many cases approximate a sodium metaphosphate in composition but are held to be mixtures of sodium polyphosphates and that are used chiefly as sequestering agents in water treatment, as deflocculating agents, and in protecting metals from corrosion
especially
: sodium metaphosphate sense 2a
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Merriam-Webster unabridged
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