The heat insulating layer may be polystyrene particle layer, foamed polyurethane layer, foamed glass layer, polystyrene board, etc.

保温层可以是胶粉聚苯颗粒保温层、聚氨酯发泡层、泡沫玻璃、聚苯板等。

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By means of comparison to different heat insulating materials, man may conveniently select heat insulating materials and determine the most suitable thickness of insulating layer.

通过不同的绝热材料的比较，可以方便地选择绝热材料和确定最适宜保温层厚度。

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High temperature, coating composition change, expansive agent happen quickly, thus forming porous expansion of insulating layer, prevent heat to the tunnel masonry relay.

高温时，涂料成分发生改变，膨胀剂迅速发生膨胀，从而形成多孔的隔热层，阻止热量向隧道砌体的传递。

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