The effect of diffusion of soil removal was demonstrated with polyester film and radio-tagged stearic acid. 污垢去除中的扩散效应，是用聚酯薄膜和放射性标志的硬脂酸来进行测试的。
A polyester film manufactured by DuPont,often used as a base for magnetically coated or perforated information media. 由杜邦公司制造的一种聚酯薄膜，常用作磁性涂层媒介或穿孔信息媒介的基底。
