How is Low Density Polyethylene (LDPE) made?

Low Density Polyethylene is made through a process known as free radical polymerization. This process requires heat (420-570 degrees K) and a lot of pressure (1000-3000 atm), so it is commonly conducted in an autoclave or tubular reactor in large batches. The first step is to gather the raw materials from petroleum by breaking down the petroleum-based hydrocarbons into smaller molecules and then separating the ethylene gas from the resulting mixture. This ethylene gas is then pumped into the reactor, where it bakes alongside an initiator like oxygen or organic peroxide to initiate polymerization. A slurry of polyethylene forms and gets extruded into granules, with any unreacted gas left in the reactor being used for the next batch. 

Once extruded, the LDPE granules can be packaged or processed further to create products through a variety of fabrication processes, such as: Injection Molding，Blow Molding，Thermoforming，Vacuum Casting，Film Making，Extrusion.

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