Polyurethane is a low density, flexible foam that offers good shock absorbency and resiliency.

聚氨脂是可提供良好冲击吸收和弹性的低密度的弹性泡沫。

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The material is a lightweight flexible foam composed of a skeletal matrix of tiny interconnecting strands which act as a three dimensional fire screen.

网状聚氨酯泡沫是一种轻质、柔性材料，它由相互连接的经络构成了空间“骨架”结构，这种结构实际上是一种三维的防火屏蔽。

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Seawater, however, is alkaline. This alkalinity causes the glue to set. It solidifies into a foam within 30 seconds and becomes a flexible, leathery substance over the course of several hours.

碱性的海水使得胶质在30秒内凝结为泡沫，并在几小时内变为柔韧的皮状表面。

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