As for insulating material, it will age rapidly when the working temperature is higher than the limit temperature. So masses heat due to large power losses will decrease the stability of the system.

在采用磁力轴承的大型的压缩机和电机中，功耗过大，产生的大量热量会使得定子和转子间的气隙变小，甚至有接触碰撞的危险；对于磁力轴承线圈的绝缘介质来说，当介质温度超过其许可工作温度时，绝缘材料将急剧老化，寿命降低得很快；所以功耗过大产生大量的热量，会降低系统性能的可靠性。

Phenolic foam is one kind of heat insulating material due to its high resist heat temperature,good inflaming retarding property,fewer smog and innocuous. Now the problem influencing of the phenolic foam is the brittleness.

酚醛泡沫是一种新型的绝热保温材料，它具有耐热、耐酸腐蚀、阻燃性优异、低烟无毒的特性，但是存在性脆、易掉渣的缺点。

In this paper,a kind of quality insulating material was made,and its performances were studied. It mainly studied systematically the effect of each component such as glazed hollow bead,fly ash,polypropylene fiber,re-dispersible emulsion powers,hydroxypropyl methylcellulose,ligno-cellulose when the mix amount changed.

解决渠道冻胀的有效措施是采用优良的保温材料。