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The average molecular weight of polyethylene can vary significantly depending on its type and method of production, typically ranging from about 5,000 to over 1,000,000 g/mol. Common grades of low-density polyethylene (LDPE) have molecular weights around 20,000 to 300,000 g/mol, while high-density polyethylene (HDPE) often falls between 100,000 and 1,000,000 g/mol. The molecular weight influences properties such as strength, flexibility, and processing characteristics.

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