High density polyethylene or HDPE is a low cost, milky white, semi-translucent thermoplastic. It is flexible but more rigid and stronger than LDPE and has good impact strength and superior puncture resistance. Like LDPE, it also has good chemical resistance, good release properties, and good vapor but poor gas barrier and weathering properties. Other limitations or disadvantages include: subject to stress cracking, difficult to bond, flammable, and poor temperature capability.
Typically, high-density polyethylene is more linear and consequently more crystalline than LDPE. The higher crystallinity leads to a higher maximal service temperature up to about 130°C and results in somewhat better creep resistance. The lower service temperature is about -40°C.
HDPE tends to be stiffer than other polyethylene films, which is an important characteristic for packages that need to maintain their shape. HDPE is easy to process and can be blended with other polymers and/or additives, like (surface treated) fillers, other polyolefin (LDPE, LLDPE), and pigments to alter its basic properties.
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