This article is a study of methylene chloride as a substitute for trichloro-fluoromethane in producing flexible polyurethane foam.

讨论了用二氯甲烷替代一氟三氯甲烷进行软质聚氨酯泡沫塑料的生产。

Polyurethane foaming box ensures good heat preservation capacity, and so ice cubes become more melting-resistible and can be stored longer.

聚氨酯发泡箱体，保温性能好，储冰时间长，不易融化。