Of course, their strength and heat resistance are low, restricted range of applications.
当然，它们的强度和耐热性都较低，应用的范围受到限制。
Heat: the temperature range in the use of non-deformation.
耐热性：在使用温度范围内不变形。
There are many types of heat preservation material, application range is very wide also.
保温材料有很多种类，应用范围也很广。
There are many types of heat preservation material, application range is very wide also.
保温材料有很多种类，应用范围也很广。
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