Boric Acid

CAS #:  10043-35-3; 11113-50-1

Synonyms: Boracic acid; orthoboric acid; Boron Trihydroxide; Hydrogen orthoborate; Trihydroxyborane

Uses: Heat- reasistant ( borosilicate) glass, glass fibers, porcelain enamels, boron chemicals, metalluragy (welding flux, brazing copper), flame-retardant in cellulosic insulation, mattress batting and cotton textile products, fungus control on citrus fruits (FDA tolerance 8pmm boron residue), ointment and eye wash (water solution only), nickel electroplating baths.

Hazard:  Although no adverse effects have been reported from inhaling boric acid dust, it is absorbed through mucous membranes. Ingestion of 5 grams or more may irritate gastrointestinal tract and affect central nervous system. Contact with dust or aqueous solutions may irritate eyes; no chronic effects have been recognized, but continued contact should be avoided. Dust and solutions are absorbed through burns and open wounds but not through unbroken skin.  BORIC ACID is a very weak acid. Incompatible with alkali carbonates and hydroxides. During an attempt to make triacetyl borate, a mixture of boric acid and acetic anhydride exploded when heated to 58-60°C. Reacts violently with the strong reducing agent potassium metal.