Lead Wool is made from the strands of lead, twisted loosely into a rope form. It is more convenient to use than the molten lead for caulking purposes because it requires no heating or pouring. Lead wool is ideal for caulking and makes a tighter seal than the molten lead that shrinks slightly after casting. It is ideal for filling openings where sheet, plate, or brick are not suitable and is positively the best way to fill crevices. It is used for the caulking of joints in large pipes e.g. gas mains and in some specialist batteries. Lead wool can be used for many applications ranging from gas sensors to small anodes.