Red Lead

Red Lead Primer is one of the oldest and most commonly used anti-corrosion pigments applied to metal surfaces. Orange-red in color, Red Lead forms the prime coat for most of the largest bridges in the world. Red Lead is also used as a primer for most of the intricate steel structures of buildings built in the 20th century. Resistant to even salt water, Red Lead was liberally applied to the hulls and decks of millions of ships. Typically, 85% Red Lead (Lead concentration = 85%) was applied to these steel surfaces. Later, Red Lead primers containing as much as 95% to 98% Lead were used.

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Red Lead Specifications

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 (Scott) gm/cc	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 mg/gm	90 to 100	90 to 110	100 to 110
Acid Absorption mg/gm	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
PbO2 (in %)	15.1 to 25.1	25.2 to 33.2	33.3 and above
Pb3O4	43.0 to 72.0	72.1 to 95.0	95.1 and above
Total Lead Oxide	99.5	99.5	99.5
Uses	Boiler & Water Pipe Line	Lead Acid Batteries Heat proof glasses Ceramics Optical glasses Fluorescent tubes	Surface coating Storage batteries Ceramics Rubber & plastics
Moisture Content (% Max)	0.05	0.05	0.05
Purity (% Min)	99.97	99.97	99.97