Polyolefins
These are obtained by the addition polymerisation of ethylene and its derivatives
1 . Polythene
Polymer of ethylene or ethene .
( i ) Low density polythene ( LDP )
It is tough , flexible , transparent , chemically inert as well as poor conductor pf electricity . It has moderate tensile strength but good tearing strength .
It is used in the insulation of electricity carrying wires and manufacture of queeze bottles , toyes and flexible pipes .
( ii ) High density polyethylene ( HOP )
It has high density due to close packing . It is also chemically inert and more tougher and harder .
It is used for making containers , house wares , bottles , toyes , electric insulation etc .