Tungsten Alloy Counterweight for Sailboats

As far as we know, in the large modern ships, the keel often made ​​or fitted with such materials with high specific gravity material such as lead. But lead is easy to produce pollution, due to the high proportion of tungsten materials and non-toxic, tungsten alloy has increasingly been used the weight of the vessel. This weight placed on the more low (usually at the bottom of the keel) more able to maintain the balance of the boat. Traditionally used sand or stone.