Low Density Poly Ethylene (LDPE) is widely used in packaging, adhesives, coatings, and films. LDPE is mainly produced through free radical polymerization of ethylene gas using tubular or autoclave reactor in high temperature and pressure environment. pyrolysis of low-density PE (LDPE) at temperatures in the range of 773 K to 973 K in a fluidized bed reactor using nitrogen as fluidizing gas. Formation of high molecular weight polymer chains, and termination by combination and cross-linking, which may lead to a broadening of molecular weight distribution. The reaction generates a large quantity of heat in the reaction zones.The reaction can also be performed at a temperature below the melting point of the tubular LDPE. This is the so-called solid-state per oxidation. Preferably, the reaction of the tubular LDPE with the free radical initiator is performed at a temperature within the range. High Pressure cross linked polyethylene tube shows water clear transparency on high heat. High pressure cross linked PE makes its feasible to use the material for applications such as automobiles muffler tail pipe.