| Identification | Back Directory | [Name]
Tincalconite (B4Na2O7.5H2O) | [CAS]
12045-88-4 | [Synonyms]
TINCALCONITE)
Tincalconite (B4Na2O7.5H2O)
sodium tetraborate pealtahydrate | [EINECS(EC#)]
205-582-1 | [Molecular Formula]
Na2B4O7·5H2O | [Molecular Weight]
291.3 |
| Chemical Properties | Back Directory | [density ]
1.880 | [form ]
hexagonal crystals | [color ]
hexagonal, hexane crystals, crystalline | [Water Solubility ]
%w of anhydrous in H2O: 16.40 (60°C), 23.38 (80°C), 34.63 (100°C); %w of pentahydrate at 25°C: 16.9% in methanol, 31.1% in ethylene glycol, 10.0% in diethylene glycol [KIR78] | [EPA Substance Registry System]
Tincalconite (B4Na2O7.5H2O) (12045-88-4) |
| Hazard Information | Back Directory | [Chemical Properties]
free flowing powder(s); trig; specific heat 1.32kJ/(kg ·K); enthalpy of formation ?4784.4MJ/ mol; used as a weed killer, and to control fungus growth on citrus fruit [KIR78] | [Physical properties]
Hexagonal crystal; density 1.88 g/cm3; decomposes on heating; reversibly converts to an amorphous dihydrate when heated at 88°C at 2 torr; soluble in water (13% at 45°C), soluble in alcohols (17% in methanol and 31% in ethylene glycol by weight). | [Occurrence]
Borax pentahydrate occurs in nature as mineral tincalconite, formed by dehydration of borax. It has several industrial applications, mostly the same as its decahydrate. The pentahydrate is used in the manufacture of borosilicate glass. It also is used in cleaning agents; ceramic glaze; adhesives; cosmetics; antifreeze; and herbicide formulations. It is added to fertilizers to provide boron as a nutrient to the plants. | [Uses]
Tincalconite (B4Na2O7.5H2O) is used as a herbicide and soil fungicide. In the glass industry, it is used to manufacture optical glass and heat- and corrosion-resistant glass. In the enamel industry, it is used as a glaze, applied to metal surfaces for durability. In the mining and metallurgical industries, it is used as an antifreeze and anti-condensation agent. In the non-ferrous metals industry, it is used as an electrolyte additive and a welding agent for non-ferrous metals. In the ceramics industry, it is used to manufacture glazes with good results. In cosmetics, it is used as a water softener. It is also used in the manufacture of corrosion and rust inhibitors and other boron compounds. | [Production Methods]
Borax pentahydrate is produced from various sodium borate and magnesium borate ores. In the United States, it is produced from dry lake brines, colemanite and tincal. It is commercially produced along with the decahydrate. The production processes are similar to decahydrate (see Borax decahydrate). |
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