Barium fluoride

Reported in EPA TSCA Inventory. Barium and its compounds are on the Community Right-To-Know List.

OSHA PEL: TWA 0.5 mg(Ba)/m³; 2.5 mg(F)/m³
ACGIH TLV: TWA 0.5 mg(Ba)/m³; Not Classifiable as a Human Carcinogen; TWA 2.5 mg(F)/m³; BEI: 3 mg/g creatinine of fluorides in urine prior to shift; 10 mg/g creatinine of fluorides in urine at end of shift.
DFG MAK: 0.5 mg(Ba)/m³
NIOSH REL: (Fluorides, Inorganic) TWA 2.5 mg(F)/m³

The IUPAC name of this chemical is barium(2+) difluoride. With the CAS registry number 7787-32-8 and EINECS 232-108-0, it is also named as Baryum fluorure. The product's categories are Industrial / Fine Chemicals; Inorganic Chemicals; Inorganics; Barium Salts; Barium Metal and Ceramic Science; Inorganic Salts; Synthetic Reagents; Crystal Grade Inorganics. It is colourless odourless crystals which is slightly soluble in hot water, soluble in acid and ammonium chloride. When heated to decomposition it emits toxic fumes of F⁻. So the storage environment should be well-ventilated, low-temperature and dry. Keep Barium fluoride separate from raw materials of food.

The other characteristics of this product can be summarized as: (1)#H bond acceptors: 0; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 0; (4)Polar Surface Area: 0 Å²; (5)Enthalpy of Vaporization: 25.54 kJ/mol; (6)Vapour Pressure: 922 mmHg at 25°C; (7)Exact Mass: 175.902047; (8)MonoIsotopic Mass: 175.902047; (9)Topological Polar Surface Area: 0; (10)Heavy Atom Count: 3; (11)Formal Charge: 0; (12)Complexity: 2.8.

Preparation of Barium fluoride: Mixing the barium carbonate and water to get the slurry. Then adding hydrofluoric acid to react. Controlling the reaction end point Ph value until unchanging. Finally, after filtration, drying, grinding, we can get the products. BaCO₃+2HF→BaF₂+CO₂↑+H₂O

Uses of Barium fluoride: It can be used as a material to make optical components such as lenses. It is also used in windows for infrared spectroscopy, in particular in the field of fuel oil analysis. What's more, it is used as a preopacifying agent and in enamel and glazing frits production. The other use is in the production of welding agents (an additive to some fluxes, a component of coatings for welding rods and in welding powders).

When you are using this chemical, please be cautious about it as the following:
It is harmful by inhalation and if swallowed. What's more, after contact with skin, wash immediately with plenty of soap-suds.

People can use the following data to convert to the molecule structure. 
1. SMILES:[Ba+2].[F-].[F-]
2. InChI:InChI=1/Ba.2FH/h;2*1H/q+2;;/p-2
3. InChIKey:OYLGJCQECKOTOL-NUQVWONBAV

The following are the toxicity data which has been tested.

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
frog	LDLo	subcutaneous	1540mg/kg (1540mg/kg)		Comptes Rendus des Seances de la Societe de Biologie et de Ses Filiales. Vol. 124, Pg. 133, 1937.
mouse	LD50	intraperitoneal	29910ug/kg (29.91mg/kg)		Deutsche Zahnaerztliche Zeitschrift. Vol. 34, Pg. 484, 1979.
rat	LD50	oral	250mg/kg (250mg/kg)	BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: ATAXIA LUNGS, THORAX, OR RESPIRATION: RESPIRATORY DEPRESSION	Vestnik Akademii Meditsinskikh Nauk SSSR. Journal of the Academy of Medical Sciences of the USSR. Vol. (2), Pg. 28, 1977.