HDPE is a hydrocarbon polymer prepared from ethylene/petroleum by a catalytic process. It has a higher specific density than low-density polyethylene, though this difference is only marginal. What really has the effect in the physical properties of HDPE is the absence of fanning, which means it is light with a high elasticity. Since there is no stretching the structure is all the more firmly stuffed, make HDPE a linear polymer. The stretching can be controlled and reduced by utilizing particular catalysts during production.