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

讨论了用二替代一氟三进行软质泡沫塑料的生。

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

发泡箱体，保温性能好，储冰时间长，不易融化。