Correct

隔热

/ gérè / 
Strokes

Definition

to insulate thermally/insulating (material, effect etc)

Example

As a Verb

insulate against heat; be heat-resistant

1
Zhèzhǒng
这种
qiáng
墙
bù
不
gérè
隔热
  
。

The wall is not heat-resistant.

2
Gérè
隔热
xìngnéng
性能

heat-proof quality

3
Gérè
隔热
shǒutào
手套
  
/
túcéng
涂层

heat-resistant gloves/coating

4
Gérè
隔热
cáiliào
材料

heat-insulating/heat-barrier material