Lead's popularity is mainly due to its outstanding physical properties: high density, ease of casting and fabrication, and malleability.
Tungsten poly is a suitable material for lead replacement applications. It has an even higher density than lead. However, due to its extremely high melting temperature, molding tungsten into a shape is complex and costly，poly is easily to be machined into different types of products, so tungsten poly is the best mateiral to be used as lead replacement.
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