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MarShield - Div. of MarsMetal Co.

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Specifying Sheet Lead

As with many other commodities, sheet lead is sold by the pound. A rather fortunate circumstance results from the fact that one square foot of lead will weigh approximately one pound when rolled or cast to a thickness of 1/64th of an inch. For each additional 1/64-inch increase in thickness, the original square foot of sheet lead will increase in weight by one pound. Thus, 4 lb. sheet lead, as it is termed commercially, is 1/l6th-inch thick; 8 lb. sheet lead is 1/8th-inch thick. Above 16 lb. sheet, this relationship does not hold exactly: and 1/2-inch sheet lead weighs 30 lbs. per square foot, while one inch weighs 60 lbs per square foot. If foil weighs less than about 3/4 lb. per square foot, it is usually designated in thousandths or ten-thousandths of an inch. The table below gives the thicknesses and weights of commercially available lead sheet. By industry definition, lead conforming to various thicknesses and widths is classified as follows:

STRIP: .187 inches (4.75 mm) and under in thickness, less than 24 inches (610 mm) wide.

SHEET: .187 inches (4.75 mm) and under in thickness and 24 inches (610 mm) or more in width.

PLATE: over .187 inches (4.75 mm) in thickness and over 10 inches (254 mm) in width.

1. The density of commercially rolled lead is 11.36 g.cm-3.
2. The commercial tolerances are ± 0.13 mm for lead up to 1.4 mm and ± 0.8 mm for heavier sheets.
3. Material and installation costs for lead sheet less than 0.8 mm thick are frequently higher than for heavier sheet.
4. Acoustical type lead is not suitable for lead shielding.