聚氨酯是电热水器常用保温材料，聚氨酯保温层多用于热水器。
原油长输管道浅埋及低洼段的热能损失较大，采用聚氨酯硬质泡沫保温层效果良好（其保温效率达86.3％）。
Shallow buried and lowland laid pipelines, on account of their greater energy loss, are better to be insulated with hard polyurethane (Its insulation efficiency goes up to 86.3%).
介绍了作为预制直埋保温管保温层的聚氨酯泡沫塑料的特性。
The characteristics of polyurethane foam used as insulating layer of prefabricated directly buried insulating pipe are introduced.
测试结果表明，聚氨酯泡沫保温层具有重量轻、强度高、吸水率低、保温效果好、离火自熄等特点；
It is showed in the test result that polyurethane foam heat-insulation layer has advantages such as weight light, strength high, absorbing water rate low and high heat -insulation effect and so on.
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