Both Polypropylene (PP) and Polyethylene (PE) are excellent materials for composite wood decking, but there are significant differences between them.

Firstly, there is a difference between the hardness of both materials. Polyethylene (PE) is tough yet light, with good resistance to impacts and abrasions. On the other hand, Polypropylene is harder and can be used for mechanical and structural applications.

Secondly, there is a difference between the stiffness of Polyethylene and Polypropylene. Polypropylene is stiffer and more chemical-resistant and scratch-resistant, while still being very tough. Polypropylene is known for its excellent chemical resistance in corrosive environments, as it is rugged and unusually resistant to many chemical solvents, bases and acids.

Summary of Properties:

Material Hardness Stiffness UV Resistance Chemical Resistance Toughness Impact Resistance Temperature Resistant Price
PP High High Good Excellent Excellent Good Higher Higher
PE Medium Medium Fair Excellent Excellent Fair Lower Lower


Other Applications:

PE: Toys, films, Pipes, Tubes, Containers, bottles

PP: Drinking/milk bottles, Beach’s chair; Swimming pool’s pumps, Hard cover luggage, Car bumper