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How To Distinguish Between HDPE and Polypropylene?
How To Distinguish Between HDPE and Polypropylene?




PE are basically divided into three categories: LDPE, HDPEand LLDPE.
HDPE is a high-density polyethylene, which is called "HighDensityPolyethylene" or "HDPE". HDPE is a highly crystalline, non-polar thermoplastic resin.
Main features:
non-toxic, odorless, odorless, melting point is about 130 °C. It has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. Dielectric properties and environmental stress crack resistance are good as well.



Name | Flammability | Combustion State | After Extinguishing | Smell |
PP | Easy |
The PP sample burns with yellow flame and its melts drop relatively quick. |
Keep burning with some curling smoke. |
Slight petrol |
HDPE | Easy |
The HDPE sample burns with blue-yellow flame and its melts drop relatively slow. |
Keep burning with heavy smoke. |
Heavy paraffin wax |
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