Lead rubber Sheets are manufactured using specific formulations with Lead as base and other speciality chemicals which in turn stops radiation penetration. This Compound is specifically Researched and Manufactured by Vishal Rubber Technologies Pvt Ltd. 

Lead Shielding - Lead Metal is a primary material for Radiation Shielding. Lead is highly effective Metal in providing protection from various sources of radiation and has become a standard in the design of Radiation Protection systems. Its density makes it one of the preferred materials for high energy radiation applications; X-rays, gamma rays and other nuclear radiations.
Theoretically, almost any material can be used for radiation shielding if employed in a thickness sufficient to attenuate the radiation to safe limits. However, due to to its specific characteristics discussed below, Lead is among the most commonly used material. The choice of the shield material is dependent upon many varied factors, such as final desired attenuated radiation levels, ease of heat dissipation, resistance to radiation damage, required thickness and weight, multiple use considerations (e.g., shield and/or structural), uniformity of shielding capability, permanence of shielding, and availability.