Fused boric acid

Synonyms Boric anhydride boron sesquiox-ide boron trioxide fused boric acid... 

Boric oxide, B2O3, is also referred to as anhydrous boric acid. The article of commerce is an amorphous material produced by fusing boric acid in a furnace. The structure of vitreous B2O3 is discussed above. Using a process... 

Tri-copper Arsenide, CusAs, has been prepared by melting a mixture of copper and arsenic under a layer of fused boric acid 8 by subjecting an intimate mixture of the elements in the required proportions to a pressure of 6500 atm. 9 by heating copper in arsenic vapour 10 by... 

SYNS BORIC ANHYDRIDE BORON SESQUIOXIDE BORON TRIOXIDE FUSED BORIC ACID... 

FUSED BORIC ACID see BMGOOO FUSED QUARTZ see SCK600 FUSED SILICA see SCK600... 

Boric Anhydride. Boron oxide boron trioxide boric oxide boron sesquioxide. B202 mol wt 69.64. B 31.07%, O 63.93%. Improperly called anhydrous boric acid or fused boric acid. Prepn of crystalline form McCulloch, J. Am. Chem. Soc. 59, 2650 (1937). 

AI3-51845 Boric acid (HBO2), anhydride Boric anhydride Boric oxide Boric oxide (B2O3) Boron oxide Boron sesquioxide Caswell No. 109B Diboron trioxide EINECS 215-125-8 Fused boric acid HSDB 1609. Used in production of boron, heat-resistant glassware, fire-resistant additive for paints, electronics, liquid encapsulation techniques, herbicide. White crystals mp = 450° bp = 1860° d = 2.46 soluble in H2O (3 g/100 ml) LDso (mus orl) = 3163 mg/kg. Atomergic Chemetals Lancaster Synthesis Co. Noah Chem. u.S. Borax Inc. 

Fused boric acid is heated in a loosely stoppered Ifyrex flask to 225-250°C after this treatment the melt retains 8-15% water. Crystallization requires a few days. If a small amount of crystalline B3O3 seed is added to the melt, which contains some water, crystallization occurs very rapidly and the water separates out. Alternatively, fused boric acid is heated to 175°C, at which point crystalline HBOg (I) separates. The material is then transferred to a closed tube and the temperature is raised to about 236°C, i.e., just below the m.p. of HBOg (I). As a result the latter evolves water and transforms to crystalline B3O3. 

CAS 1303-86-2 EINECS/ELINCS 215-125-8 Synonyms Boric anhydride Boric oxide Boron sesquioxide Boron trioxide Diboron trioxide Fused boric acid Classification Oxide En mical BjO,... 

Furyl alcohol 2-Furylcarbinol a-Furylcarbinol. See Furfuryl alcohol 2-Furyl methanal. See Furfural (2-Furyl) methanol. See Furfuryl alcohol Fused boric acid. See Boron oxide... 

Boric acid is used in the manufacture of glass (borosilicate glass), glazes and enamels, leather, paper, adhesives, and explosives. It is widely used (particularly in the USA) in detergents, and because of the ability of fused boric acid to dissolve other metal oxides it is used as a flux in brazing and welding. Because of its mild antiseptic properties it is used in the pharmaceutical Industry and as a food preservative. 

Synonyms Boric anhydride Boric oxide Boron sesquioxide Boron trioxide Diboron trioxide Fused boric acid... 

See Polypropylene Fused boric acid. See Boron oxide Fused quartz Fused silica. See Silica, fused Fusel oil. See Fusel oil refined Fusel oil refined... 

Boron III) oxide, B2O3, is obtained by ignition of boric acid. Combines with water to reform B(0H)3. The fused oxide dissolves metal oxides to give borates. 

Boric oxide is produced by treating borax with sulfuric acid in a fusion furnace. At temperatures above 750°C, the molten boric acid layer separates out from sodium sulfate. It then is decanted, cooled, and obtained in 96-97% purity. Boric acid above 99% purity may be obtained by fusing granular material. 

The alkali niobates are most conveniently prepared by the action of caustic alkalis on niobic acid or on solutions of niobium oxytri-fluoride. Other compounds of niobic acid and bases are generally prepared by fusing niobic add with the oxide, hydroxide, carbonate, or other salt of the metal. Occasionally double decomposition of a soluble alkali niobate and a soluble salt of the metal has been employed. Larsson s method1 consists in predpitating a solution of potassium niobate with a salt of a metal the dried predpitate is fused for thirty-six hours at a high temperature with boric acid, and the melt is boiled with water to which hydrochloric acid has been added. The residue consists of crystals of the insoluble niobate of the metal, usually the metaniobate. 

Another manganese niobate, 3Mn0.5Nb205, has been obtained by adding manganese sulphate to potassium niobate and fusing the precipitate with boric acid. It consists of small, greyish-yellow, prismatic rods, density 4-97.1... 

Anhydrous tantalum pentoxide, as usually prepared, is a white, nonvolatile,8 tasteless, odourless, amorphous powder, which remains white at high temperatures. When heated to dull redness it glows and assumes a crystalline form (rhombic prisms), isomorphous with niobium pentoxide 10 the same change takes place when the amorphous substance is fused with boric acid or microcosmie salt.11 Its melting-point... 

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