隔热型材的内外两面，可以是不同断面的型材，也可以是不同表面处理方式的不同颜色型材。但受地域，气候的影响，避免因隔热材料和铝型材的线膨胀系数的差距很大，在热胀冷缩时二者之间产生较大应力和间隙；同时隔热材料和铝型材组合成一体，在门窗和幕墙结构中，同样和铝材一样受力。因此，要求隔热材料还必须有与铝合金型材相接近的抗拉强度、抗弯强度，膨胀系数和弹性模量，否则就会使隔热桥遭到断开和破坏。因此，隔热材料的选用是非常重要的。
The inner and outer surfaces of the thermal insulation profiles can be profiles with different sections or different colors with different surface treatment methods. However, due to the influence of region and climate, large stress and gap between thermal insulation material and aluminum profile can be avoided due to the large difference of linear expansion coefficient between thermal insulation material and aluminum profile; at the same time, the thermal insulation material and aluminum profile are combined into a whole, which is the same as aluminum in the structure of doors, windows and curtain walls. Therefore, the thermal insulation material must also have the tensile strength, bending strength, expansion coefficient and elastic modulus close to the aluminum alloy profile, otherwise the heat insulation bridge will be broken and damaged. Therefore, the selection of thermal insulation materials is very important.