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Lead

Lead structure

CAS No:
7439-92-1
Formula:
Pb
Chemical Name:
Lead
Synonyms:
Lead;C.I. Pigment Metal 4;Lead Flake;Lead S 2;Pb-S 100;Lead element;SSO 1;C.I. 77575;PS 2 (metal);PS 2;SRM 981;724427-66-1
Categories:
Inorganic Chemistry > Elementary Substance

Description

Occurring naturally in the earth’s crust, lead is a heavy bluish-gray metal that is lustrous when freshly cut. It is rarely found as a pure metal but rather is complexed with other elements to form lead compounds. Found in ore with copper, zinc, and silver, lead is found in mineral form as galena (PbS), anglesite (PbSO4), and cerussite (PbCO3). It is easily malleable, smelted, and can be added to other metals to form alloys. Resistant to air and water corrosion, it does not mix easily with many

Lead Basic Attributes

Molecular Weight：

207.2

Exact Mass：

207.97700

EC Number：

231-100-4

HScode：

78011000

Characteristics

PSA：

XLogP3：

-0.15580

Appearance：

Olive-green or red to brown wire

Density：

11.34 g/cm³ @ Temp: 20 °C

Melting Point：

327.4 °C

Boiling Point：

1740 °C

Refractive Index：

2.881 (632.8 nm)

Water Solubility：

H2O: soluble

Storage Conditions：

Store in a secure poison location. Lead must be stored to avoid contact with oxidizers (such as perchlorates, peroxides, permanganates, chlorates, and nitrates) and chemically active metals (such as potassium, sodium, magnesium, and zinc), since violent reactions occur.

Vapor Pressure：

0 mmHg (approx)

Toxicity：

Celiac-rat LDL0: 1000 mg/kg

Flammability characteristics：

Nonflammable

Explosive limit：

Mixtures of hydrogen peroxide + trioxane explode on contact with lead.

Odor：

None

Taste：

Can not taste lead in water

Safety Information

Packing level：

III

Hazard category：

Transport codes：

UN 3082 9/PG 3

wgk germany：

hazard class code：

61-33-40-48/20-62-36/38-20/22-51/53-50/53-48/20/22-52/53-34-23/24/25

safety instructions：

53-45-61-36/37-36-26-60-36/37/39

RTECS Number：

OF7525000

Marks：

T,Xi,Xn,N

Storage features：

The warehouse is ventilated and dry at low temperature; stored separately from hydrogen peroxide, sodium azide and oxidant

Stability/Shelf Life：

Stable. Incompatible with strong oxidizing agents, potassium, sodium.

Precautionary statement(s)：

P201-P261-P273-P304 + P340 + P312-P308 + P313-P391

Hazard Statements：

H302 + H332-H351-H360Df-H373-H410

Toxicity

Toxicity class：

moderately toxic

Lead Use and Manufacturing

Methods of Manufacturing

The electrolytic method uses No. 1 lead ingot as a raw material, adopts the Bett lead smelting method, and uses fluorosilicic acid as an electrolytic bath. The conditions for its electrolytic refining are: the electrolyte composition contains lead 80-100 g/L, fluorosilicic acid 90-140 g/L, electrolyte temperature 34-40°C, bath voltage 0.6-0.7 V, and current density 0.98-2 A /cm2. After electrolytic refining, 99.999% high purity lead is produced. Then 99.999% high-purity lead is used as a raw material, and further refined by electrolytic refining to obtain 99.9999% high-purity lead.

Uses

Construction material for tank linings, piping, and other equipment handling corrosive gases and liqs used in the manufacture of sulfuric acid, petroleum refining, halogenation, sulfonation, extraction, condensation; for x-ray and atomic radiation protection; manufacture of tetraethyllead, pigments for paints, and other organic and inorganic lead Compounds; bearing metal and alloys; storage batteries; in ceramics, plastics, and electronic devices; in building construction; in solder and other lead alloys; in the metallurgy of steel and other metals.

Computed Properties

Molecular Weight:207
Exact Mass:207.97665
Monoisotopic Mass:207.97665
Heavy Atom Count:1
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

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Ingredients	Red lead, talcum powder, lead powder, rosin, gypsum (calcined), and alum.
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Sweep away ointment
Ingredients	Red lead, talcum powder, lead powder, rosin, gypsum (calcined), and alum.
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