7783-46-2 Usage
Uses
Used in Glass Industry:
Lead fluoride is used as an additive in low melting glasses for its ability to lower the melting point and improve the glass's workability. It is also utilized in glass coatings to enhance their reflective properties, particularly in reflecting infrared rays, which can be beneficial for energy-efficient applications.
Used in Electronics Industry:
In the electronics industry, lead fluoride is employed as a component in phosphors for television-tube screens, contributing to improved display quality and performance. Additionally, it is used for nickel plating on glass, which can enhance the glass's durability and appearance.
Used in Chemical Industry:
Lead fluoride serves as a catalyst in the manufacture of picoline, an important organic compound used in the production of various chemicals and materials. Its catalytic properties make it a valuable asset in the chemical industry for enhancing reaction rates and improving overall process efficiency.
Used in Fuses:
Lead fluoride is also used in the production of fuses, where its properties allow for controlled electrical conductivity and predictable melting points, ensuring safety and reliability in electrical systems.
Physical Properties:
Lead fluoride exists as colorless orthorhombic crystals or a white powder, with a density of 8.445 g/cm3 in its orthorhombic form and 7.750 g/cm3 in its cubic form. It converts to the cubic form at a temperature of 316°C and melts at 855°C, while it vaporizes at 1,290°C. Lead fluoride is slightly soluble in water (640 mg/L at 20°C) and has a solubility product constant (KSP) of 7.12x10–7 at 25°C. It is soluble in nitric acid but insoluble in acetone and ammonia.
Chemical Properties:
Lead fluoride is a white to colorless, odorless crystalline solid with a rhombic or orthorhombic structure. Its unique chemical properties make it suitable for a wide range of applications, from the glass and electronics industries to the chemical and electrical sectors.
Preparation
Lead difluoride can be prepared by several methods. It is obtained by treating lead hydroxide or lead carbonate with hydrofluoric acid, followed by evaporation of the solution:
Pb(OH)2 + 2HF → PbF2 + 2H2O
Alternatively, it is precipitated by adding hydrofluoric acid to a lead(II) salt solution; or adding potassium fluoride to lead nitrate solution:
2KF + Pb(NO3)2 → PbF2 + 2KNO3
Lead difluoride also can be directly synthesized from its elements, by the action of lead with fluorine.
Toxicity
Slightly to moderately toxic by ingestion and subcutaneous routes. The oral LD50 in rats is around 3,000 mg/kg.
Reactivity Profile
Calcium carbide mixed with Lead fluoride , at ordinary temperatures, becomes incandescent [Mellor 5:862-64. 1946-47].
Health Hazard
Not irritating to skin or mucuous membranes; protect against chronic poisoning. Early symptoms of lead intoxication via inhalation or ingestion are most commonly gastrointestinal disorders, colic, constipation, etc.; weakness, which may go on to paralysis chiefly of the extensor muscles of the wrists and less often the ankles, is noticeable in the most serious cases. Ingestion of a large amount causes local irritation of the alimentary tract; pain, leg cramps, muscle weakness, paresthesias, depression, coma, and death may follow in 1 or 2 days. Contact with eyes causes irritation.
Fire Hazard
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Potential Exposure
Used to make other chemicals, underwater paints; electronic and optical parts (for growing
single-crystal, solid-state lasers); in high-temperature dryfilm lubricants; and making special grades of glass.
Shipping
UN3288 Toxic solids, inorganic, n.o.s., Hazard
Class: 6.1; Labels: 6.1-Poisonous materials, Technical
Name Required. UN2291 Lead compounds, soluble n.o.s.,
Hazard Class: 6.1; Labels: 6.1-Poisonous materials,
Technical Name Required
Incompatibilities
Violent reaction with oxidizers, chemically active metals; calcium carbide. May ignite combustibles, such as wood, paper, oil, etc
Check Digit Verification of cas no
The CAS Registry Mumber 7783-46-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 3 respectively; the second part has 2 digits, 4 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 7783-46:
(6*7)+(5*7)+(4*8)+(3*3)+(2*4)+(1*6)=132
132 % 10 = 2
So 7783-46-2 is a valid CAS Registry Number.
InChI:InChI=1/2FH.Pb.2H/h2*1H;;;/q;;+2;;/p-2/r2FH.H2Pb/h2*1H;1H2/q;;+2/p-2
