What do LDP and HDP signify ? How are these prepared ?

Explanation

Polythenes are two types :
LDP( Low Density Polythene),2) HDP(High Density Polythene)
Low Density Polythene : LDP is formed by the polymerisation of ethene under high pressure of 1000 to 2000 atm . At a pressure of 350 to 570k in the presence of traces of dioxygen (or) a peroxide initiator.
Properties :
a) This obtained through the free radical additon .
b) LDP is chemically inert and tough .
c) LDP is flexible and a conductor of electricity.
Uses :
a) It is used in the insulation of electric cabels ,
b) It is used in the manufacture of pipes in agriculture irrigation .
2) High Density Polythene : HDP is formed by the polymerisation of ethene in hydro carbon solvent in presence of ziegler natta catalyst at a temperature of 333k to 343 k and under a pressure of 6-7 atm
Properties :
a) HDP consisrs of linear molecules and has high density due to close packing .
b) It is chemically intert and more tough , hard .
Uses:
a) It is used in manufacture of house hold articles like buckets, dustbins etc.
b) It is used in manufacture of pipes .