它们通常由乙烯基醋酸乙脂(EVA)泡沫或聚氨酯(PU)材料制成，很多情况还填充了空气或胶体。
It's generally made from ethyl vinyl acetate (EVA) foam or polyurethane (PU) and in many cases is supplemented by air or gel inserts.
通过实际应用试验，证明EPU聚脲-醋酸钙复合润滑脂使用寿命长，润滑性好，是一种综合性能好、应用范围广的润滑脂。
It is proved through field test that this grease can offer better comprehensive properties including long life and good lubrication, and thus can be used in wide applications.
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