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ChemicalBook--->CAS DataBase List--->7787-49-7

7787-49-7

7787-49-7 Structure

7787-49-7 Structure
IdentificationBack Directory
[Name]

Beryllium fluoride
[CAS]

7787-49-7
[Synonyms]

BeF2
BERYLLIUM FLUORIDE
Beryllium difluoride
Beryllium fluoride,97%
berylliumfluoride(bef2)
berylliumfluoride[bef2]
Beryllium fluoride 99.5%
Beryllium fluoride,98.5+%
Beryllium fluoride (BeF2)
Beryllium fluoride(Be2F4)
Berylliumfluoride,99.9%(metalsbasis)
Berylliumfluoride,32.5-33.5%aq.soln.,99.9%(metalsbasis)
[EINECS(EC#)]

232-118-5
[Molecular Formula]

BeF2
[MDL Number]

MFCD00014194
[MOL File]

7787-49-7.mol
[Molecular Weight]

47.01
Chemical PropertiesBack Directory
[Appearance]

white powder
[Melting point ]

545 °C
[Boiling point ]

1169°C (estimate)
[density ]

1,986 g/cm3
[solubility ]

very soluble in H2O; slightly soluble in ethanol
[form ]

Powder
[color ]

White
[Water Solubility ]

very soluble H2O [MER06]; slightly soluble alcohol [HAW93]
[EPA Substance Registry System]

Beryllium difluoride (7787-49-7)
Hazard InformationBack Directory
[Chemical Properties]

white powder
[Definition]

ChEBI: The fluoride salt of beryllium (+2 oxidation state). In the solid state it exists as a glass, with four-coordinate Be2+ tetrahedral centres and two-coordinate fluoride centres. As a gas it adopts a linear triatomic structure and in the liquid state a fluctuating tetrahedral structure. In protein crystallography it is used as a mimic of phosphate.
[Uses]

manufacture of Be and Be alloys; manufacture of glass; in nuclear reactors.
[General Description]

Odorless white solid. Denser than water.
[Air & Water Reactions]

Water soluble.
[Reactivity Profile]

Beryllium fluoride is incompatible with the following: Acids, caustics, chlorinated hydrocarbons, oxidizers, magnesium, molten lithium .
[Health Hazard]

Any dramatic weight loss should be considered as possible first indication of beryllium disease. Inhalation causes irritation of nose, throat, and lungs, severe pneumonitis, and/or pulmonary edema. Ingestion causes fatigue, weakness, loss of appetite. Contact with eyes causes severe irritation and burns. Contact with skin causes dermatitis and non-healing ulcers.
[Fire Hazard]

Special Hazards of Combustion Products: Toxic and irritating vapor of unburned material may form in fire.
[Hazard]

A known carcinogen. Toxic by inhalation and ingestion.
[Description]

Beryllium fluoride has the formula, BeF2, and is a hygroscopic, amorphous solid with a melting point of 800°C. It is soluble in water and is used in beryllium metallurgy in which the metal, Be, is employed as an alloy. Solid crystalline BeF2 has a silica-like structure with beryllium in a four-coordinate position.
[Physical properties]

Glassy solid; tetragonal crystal system; hygroscopic; density 2.1 g/cm3; melts BERYLLIUM FLUORIDE 101 at 552°C; vaporizes at 1,169°C; very soluble in water; sparingly soluble in alcohol.
[Preparation]

Beryllium fluoride is made by thermal decomposition of ammonium beryllium fluoride at 900 to 950°C.
[Safety Profile]

Confirmed carcinogen withexperimental carcinogenic and tumorigenic data byinhalation. Poison by ingestion, subcutaneous,intravenous, and intraperitoneal routes. Incompatible with Mg. When heated to decomposition, itemits very toxic fumes of BeO and F
Safety DataBack Directory
[Hazard Codes ]

N-T+,Xi
[Risk Statements ]

51/53-49-48/23-43-36/37/38-26-25
[Safety Statements ]

61-53-45
[RIDADR ]

UN1566
[Hazard Note ]

Irritant
[HazardClass ]

6.1
[PackingGroup ]

II
[Hazardous Substances Data]

7787-49-7(Hazardous Substances Data)
[Toxicity]

LD50 orl-rat: 98 mg/kg XEURAQ UR-154,1951
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