polyurethane rigid foam的用法和样例：
例句
- This paper deals with the production and properties of iso-pentane blown PU rigid foams,and safety control.
本文将详细讨论异戊烷发泡聚氨酯硬泡的生产和泡沫性能及安全控制。 - The relevant safety technique and the safety operaional procedures in cyclopentane blowing process of rigid polyurethane foam are introduced.
介绍了聚氨酯硬泡环戊烷发泡工艺中相关的安全技术和安全操作规程。
