In the design of pre-insulated ducts, the density factor of the foam and the plasticity of the foam and the aluminum coating should be considered together and optimally. The density of 45-50 KG/M3 provides the lowest heat transfer coefficient with the highest flexibility in shaping and shaping.
Contrary to what is thought that the stiffer material of the foam has a higher quality, it should be considered that the harder this type of sheet is, the less its malleability and formability and also the effect It will affect the heat transfer coefficient.
Also, in relation to the aluminum coating used on the sides of this product, it seems necessary to mention a few points in this regard: the thickness of aluminum is produced in several different thicknesses according to different uses, and the thicker it is, obviously, the stronger it is. has
On the other hand, the reason for using aluminum in the outer layer of this product is its resistance to rust and corrosion, and the purity of aluminum plays a decisive role in this regard, for this reason, in comparing two samples of sheets with the same thickness of aluminum coating, if there is a difference in Its difficulty can be observed due to the presence of alloys and other impurity materials in the coating of the sheet, which causes rust and corrosion against moisture.