Red Lead

Red lead is also known as minium, triplumbic or lead tetroxide or lead tetroxidetetroxide, is a bright red or orange crystalline or amorphous pigment. Minium was first mined from the River Minius in northwest Spain , thus, in Latin Red Lead is called Minium. Red Lead Manufacturer India

Instead of getting dissolved in water and alcohol, it is soluble in hydrochloric acid present in the stomach. But in contrast, it is toxic when ingested. It has the nature to dissolve into hydrogen peroxide, diluted mixture of nitric acid, hydrochloric acid and glacial acetic acid.

The formation minium happens only in oxidizing conditions of a lead ore bodies. It is uncommon to get natural minium. Once in Broken Hill , New South Wales , Australia , there occurred a mine fire and as a result minium was formed. Lead Tetroxide melts at 500 °C degree Celsius. At this temperature it decomposes to Lead (II) oxide and oxygen.

 

Chemically, Red lead is known as tetroxide, 2PbO.PbO2 or Pb3O4. Red Lead is used in rust proof paint, batteries and lead glass manufacturing industries.

ATTRIBUTE

RED LEAD

 

JOINTING GRADE

SETTING GRADE

NON-SETTING GRADE

Colour

Orange Red to Brick Red

Orange Red to Brick Red

Brilliant Orange Red to Brick Red

Crystal Structure

Spinal Structure

Spinal Structure

Spinal Structure

Thermal Stability

500 ° C

500 ° C

500 ° C

Specific Gravity

9.1

9.1

9.1

Retention on 240 mesh IS Sieve
(63 micron) (max %)

0.25

0.15

0.15

Apparent Density

1.6 to 1.8

1.3 to 1.6

1.2 to 1.3

Matter soluble in water (in %)

0.3

0.3

0.3

Water Absorption

90 to 100

90 to 110

100 to 110

Acid Absorption

160 to 170

150 to 160

130 to 150

Volatile Matter at 105°C (in %)

0.2

0.2

0.2

Oil Absorption

6-7

6-7

6-7

Free Lead (% Max)

Traces

Traces

Traces

PbO 2 (in %)

15.1 to 25.1

25.2 to 33.2

33.3 and above

Pb 3 O 4

43.0 to 72.0

72.1 to 95.0

95.1 and above

Total Lead Oxide

99.5

99.5

99.5

Moisture Content (% Max)

0.05

0.05

0.05

Purity (% Min)

99.97

99.97

99.97