The difference between a PP and PE product
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.
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, ground mat, hockey shooting pad, hockey dasher board, cutting board, all kinds of display parts
PP: Drinking/milk bottles, Beach’s chair; Swimming pool’s pumps, Hard cover luggage, Car bumper, orthotics, water tank etc.
Summary:
1.“PP” stands for “polypropylene” and “polypropene”; “HDPE” stands for “high-density polyethylene.”
2.It is made from propylene; HDPE is made from petroleum.
3.The crystallinity of PP is less than HDPE.
4.The melting range of PP is 160-166 degrees Celsius; HDPE can withstand temperatures as high as 120 degrees Celsius.
5.Molding and extrusion methods are used along with blow molding for its manufacturing. HDPE is manufactured by polymerization and comonomers are added to reduce branching.
6.They have varied applications.
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