Formula: Pb3O4 + PbO
- Litharge (Yellow Lead) (PbO), Lead monoxide, Massicot
Plumbous oxide
- Red Lead Oxide (Pb3O4) or Lead Ortho-plumbate
CAS No.: 1314-41-6
Apperance: Red and Yellow powder
Applicaton: Litharge, an important intermediate, is used in a variety of industries like ceramics and glass, lubricants and greases, insecticides, inorganic pigments, Lead soaps, petroleum refining, rubber and PVC. Red Lead is also used to a certain extent in the ceramics and glass, paints and pigments and explosives industries.
Standard Specification
| Red Lead Standard Specification |
|
Litharge (Yellow) Standard Specification |
| ATTRIBUTE |
RED Lead SETTING GRADE |
RED Lead NON-SETTING GRADE |
|
Colour
|
Orange Red to Brick Red
|
Brilliant Orange Red to Brick Red
|
|
Crystal Structure
|
Spinal Structure
|
Spinal Structure
|
|
Thermal Stability
|
500 ° C
|
500 ° C
|
|
Specific Gravity
|
9.1
|
9.1
|
|
Retention on 240 mesh Sieve/63 micron 15' Sieve (max %)
|
0.15
|
0.15
|
|
Apparent Density
|
1.3 to 1.6
|
1.2 to 1.3
|
|
Subsidence in Petrol / Water mi/gm
|
0.38 to 0.45
|
0.43 to 0.45
|
|
Water Absorption
|
80 to 100
|
100 to 110
|
|
Acid Absorption
|
150 to 160
|
130 to 150
|
|
Volatile Matter
|
0.01
|
0.003
|
|
Oil Absorption
|
6-7
|
6-7
|
|
Free Lead (% Max)
|
Traces
|
NIL
|
|
PbO %
|
18 to 27
|
30 to 33.1
|
|
PbO
|
51.6 to 77.4
|
86 to 95
|
|
Moisture Content (% Max)
|
0.05
|
0.05
|
|
Purity (% Min)
|
99.99
|
99.99
|
|
|
| ATTRIBUTE |
COMPOSITION |
|
Colour
|
Canary Yellow with Reddish tinge
|
|
Crystal Structure
|
Orthombic + Tetragonal
|
|
Specific Gravity
|
9.5 to 9.9
|
|
`
|
250 ° C to 897 ° C
|
|
Retention on 240 mesh Sieve/63 micron 15' Sieve (max %)
|
0.1
|
|
Apparent Density (scott) gms/cc
|
1.8 to 2.2
|
|
Subsidence in Petrol / Water mi/gm
|
0.40 to 0.42
|
|
Water Absorption
|
90 to 100
|
|
Acid Absorption
|
80 to 110
|
|
Solubility in Water gms/litre
|
0.10
|
|
Oil Absorption
|
0.1
|
|
Insoluble matter in Acetic Acid (% Max)
|
0.08
|
|
Free Lead (% Max)
|
0.01 to 0.05
|
|
PbO (% Min)
|
99.5
|
|
 |
. |
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