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LEAD WOOL

Lead wool is made by scratching fine strands from the surface of a Lead disc. It is used for the caulking of joints in large pipes e.g. gas mains and in some specialist batteries.

Lead Wool, a form of caulking Lead, is long, fine strands of chemical grade Lead which is twisted into 5/8”rope for use in various applications and is available in 5 lb. cartons or 50 lb. waterproof bags. It averages about 2-½ ft. to one pound. Lead wool is certified to meet Federal Specification QQ-C-40.

The Lead wool is used to seal flanged connections, cast iron, cement and earthenware pipes, and apertures of walls and ceilings. Very good ductility of Lead ensures fast and easy filling and sealing of small slots too. It is also convenient for anti-radiation protection. The Lead resistance to aggressive environment is a warranty of long-term durability of seal.

Lead wool, a loose rope of fibers, is produced by passing molten Lead through a fine sieve and allowing it to solidify. When forced into a crevice under considerable force, the fibrous rope cold welds into a homogeneous mass, forming a solid metal seal. This caulking process is useful where temperature or explosion hazards prohibit the use of flame heating. The gaps between Lead shielding sheets in nuclear submarines are often filled and caulked with Lead wool. It is more convenient to use than molten Lead for caulking purposes because it requires no heating or pouring. Lead Wool properly packed is ideal for caulking and makes a tighter seal than molten Lead which shrinks slightly after casting.

Element

Grade AA

Grade C

Grade D

(Max.)

(Max.)

(Max.) or range

Lead

1

1

1

99.7

99.7

99.82

Antimony and arsenic (total)

2

2

 0.002

 0.02

 0.02

Iron

-

-

  .002

Bismuth

-

-

  .025

Zinc

-

-

  .001

Copper

-

-

  .040 to 0.080

Silver

-

-

  .020

Tellurium

-

-

  .035 to .055

Tin

-

-

  .016

1 Minimum.

2 Antimony content only.

Lead Wool is twisted loosely into rope form. It is easy to use than molten Lead for caulking purposes because it does not require heating. In some situations, wet conditions, for instance, are hazardous to use molten Lead to make caulked joints on cast iron drain pipe. In such a situation the solution could be to use the process of Cold- Caulking by making a caulked joint with Lead wool. Very good ductility of Lead ensures fast and easy filling and sealing of small slots too. The Lead resistance to aggressive environment is a warranty of long-term durability of seal.

It is ideal for filling openings where sheet, plate, or brick are not suitable and is positively the best way to fill crevices.

Applications / Uses

  • Lead Wool is used to seal flanged connections, cast iron, cement and earthenware pipes, and apertures of walls and ceilings.
  • Lead Wool is also convenient for anti-radiation protection.