Boric Acid
H3 B O3
{Merck Index - © 1952 by Merck & Co., Inc.}

Boric Acid: Boracic acid; orthoboric acid. H8BO3; mol.wt. 61.84. B 17.5%, B2O3 56.29%. It is 99.5-99.8% pure.

Colorless, odorless, transparent crystals, or white granules or powder; slightly unctuous to the touch. m. about 160°. On heating at 100-105° loses 1 H2O, forming metaboric acid; on long heating at 140-160° it goes over into pyroboric acid; at still higher temps. the anhydride is formed. Volatile in steam. pH: 5.1 (0.1 molar). One gram dissolves in 18 ml. cold, 4 ml. boil. water, in 18 ml. cold, 6 ml. boil. alcohol, in 4 ml. glycerol; solubility in water is increased by HCl, citric or tartaric acids.

Incompat. Alkali carbonates and hydroxides.

Use: For weatherproofing wood and fireproofing fabrics; as a preservative; manuf. cements, crockery, porcelain, enamels, glass, borates, leather, carpets, hats, soaps, artificial gems; in nickeling baths; cosmetics; printing and dyeing, painting; photography; for impregnating wicks; electric condensers; hardening steel.

Grades available: Reagent, U.S.P., technical.

Med. Use: Mild antiseptic as a satd. soin. or 10% ointment.

Toxicity: Serious poisoning can result from the ingestion of 5 g. Chronic use may result in eczema, localized edema, stomatitis, gray line on the gums.

Vet. Use: As Med. Use.


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