The method of forming thin-walled cupped articles from unpigmented polypropylene sheet by plug-assisted fluid pressure forming of the sheet at a temperature 4 DEG to 15 DEG C. below its melting point is known to produce clear, oriented articles of good impact strength. The low temperature impact strength of these articles can be significantly improved with little or no sacrifice of clarity by making them from sheet produced from a blend of a crystalline propylene polymer with from 1 to 30% of low density polyethylene.
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