While disposable cups are made predominantly of cardboard (about 95% by weight), they also contain about 5% polyethylene in the form of a thin coating inside the cup.
便携杯子虽主要由硬纸板构成（重量占比达到约95%），但还是包含了约5%的聚乙烯（polyethylene）以很薄的涂层形式附着在杯子内侧。
All the cartons are lined with shockproof corrugated cardboard and are wrapped up with damp proof polyethylene sheets.
所有纸箱都内衬防震波状硬纸壳，外用防潮塑料纸包裹。
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