octaborate

Disodium octaborate is a borate of sodium, a chemical compound of sodium, boron, and oxygen — a salt with elemental formula Na2B8O13 or (Na+)2[B8O13]2−, also written as Na2O·4B2O3. It is a colorless crystalline solid, soluble in water.
Disodium octaborate is traded either as a liquid concentrate, or as the tetrahydrate Na2B8O13·4H2O, a white odorless powder. It is used as an insecticide, and as a fungicide and algicide, and as a fire retardant., and as a boron micronutrient additive in fertilizers. Trade names include Bora-Care, Borathor, Termite Prufe, Board Defense, Polybor, Tim-bor, and Can-Bor.

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