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HDPE” and “MDPE” are two different categories of PE, or polyethylene. HDPE and MDPE are differentiated and categorized into different classes on the basis of density and branching.
“HDPE” stands for “High-Density Polyethylene.” HDPE falls into the high-density category due to its value being either 0.941g/cm3 or greater than that. HDPE has strong intermolecular forces and high-tensile strength because of its lower degree of branching. It is mainly manufactured by using catalysts like silica or chromium, metallocene, or Ziegler-Natta catalysts. The branching is lowered with the help of catalysts, and the amount of branching can be controlled by using the appropriate catalyst. Branching is also controlled by controlling the reaction conditions.
HDPE has excellent chemical resistance. It has high crystallinity and thus does not dissolve easily. It is resistant to dissolving at room temperature. Because of its characteristics, HDPE is used for manufacturing packaging products, detergents, garbage containers, etc.
MDPE stands for “Medium-Density Polyethylene” MDPE falls in the medium-density category due to its value being in the 0.926-0.940g/cm3 range. MDPE is manufactured by using catalysts like Ziegler-Natta, chromium/silica catalysts, and metallocene catalysts. MDPE has excellent chemical resistance and is very stable at room temperature. It does not dissolve at room temperature.
MDPE has very good drop resistance and shock resistance. It is less sensitive and has a higher stress-cracking resistance than HDPE. It is used for varied purposes, but some primary usages are for gas pipes manufacturing, carrier bags, packaging film, etc.