One is the "substitution":

With the low cost of the relevant departments of the state defined only for non structural materials - General plastic PVC insulation (PVC) (hereinafter referred to as PVC insulation) to replace the European general recognized decades of glass fiber reinforced polyamide Niron (PA66) (hereinafter referred to as the Niron 66 insulation insulation)Because the PVC linear expansion coefficient (8.3*10-5K-1) and Aluminum Alloy linear expansion coefficient (2.35*10-5K-1)) far, and its intensity is low (only about 30N/mm2), poor heat resistance (80 DEG C), poor aging resistance and many other defects caused by PVC wear insulated windows and doors insulation composite after heat insulation aluminum section is made in the actual installation after due to thermal expansion and contraction will cause PVC insulation in aluminum in loose, or even completely out, ranging from lead form loosening, deformation, thus breaking the window air tightness and water tightness,Weight is leading to the overall form of loose, out of.

The two is "sneak":

At present in the insulated aluminum doors and windows engineering there is no shortage of companies using imported nylon 66 insulation insulation window like the tender bid after the use of PVC insulation or insulation of the actual processing of domestic nylon or imported nylon 66 insulation with PVC or other insulation and mix, will import a nylon 66 insulation face foreign trademarks, to "prove" the insulation "quality status".This "pull" has a strong concealment, insulated aluminum doors and windows project owners only in the insulation aluminum profile has not been processed ahead can be identified, because only two are the insulation is recognizable.

The three is the "fish in troubled waters":

Heat insulation material is the basic guarantee of the quality of heat insulation doors and windows, but it is not the only guarantee. 2003 domestic nylon insulation began to market, in order to reduce the cost of domestic nylon insulation by general mineral materials (commonly known as filler) in whole or in part to replace glass fiber filled polyamide nylon production. This heat insulation in mechanical strength, heat resistance, aging resistance and so on can not be compared with the glass fiber reinforced nylon 66 insulation.But because of the national construction industry standard "insulation" is in the final approval process, so the domestic nylon insulation on its nylon with general mineral mixing injection molding related performance testing, and the test report for the performance test report shows the insulation products. This raw material testing data can only represent its material properties, experienced in hot extrusion and cooling process and the production of finished product performance will be greatly changed.

The four is "opportunistic":

Some insulating aluminum doors and windows enterprise in the full research, grasp between PVC insulation, insulation and domestic nylon 66 imported nylon insulation of the three performance difference after the compromise of both the economy and the relative insurance: aluminum window frames with low quality and low cost of PVC or domestic nylon insulation, using aluminum sash 66 high quality imported nylon insulation. They think: the window frame aluminum is fixed to the wall above, even if the quality risk is not a big problem, and the window sash aluminum profile is active and is a separate bearing, so can not and dare not have quality problems.
The five is cheating"

Some enterprises insulated aluminum doors and windows in the study of psychology, people only care about the insulation material quality, but rarely consider the two layers of Aluminum Alloy alloy quality, according to the national standard building materials Aluminum Alloy if the 6063 card alloy, while some companies use Aluminum Alloy standards to do thermal insulation aluminum composite windows and doors, causing a window sash and a window frame the angle is not strict, it is difficult to heat insulation doors and windows. So not only the insulation quality is good or bad, the Aluminum Alloy also depends on the hardness, strength, different electrostatic spraying and electrophoretic coating also reach the surface, the former is a physical change, see Baidu Encyclopedia of electrostatic spraying technology",Electrophoretic process" was founded in 1960s, by the Ford motor company was first applied to automotive primer. Because of its excellent anti-corrosion function, do not fade, soon to be widely applied in the military industry. In recent years, it is applied to the surface treatment of doors and windows. Because of its excellent quality and high environmental protection, is gradually replacing the traditional paint spraying. Electrophoresis is the electrophoretic coating in Yin and Yang, applied voltage, ionic charge of the coatings to the cathode, and the cathode surface and alkaline generated by the formation of insoluble matter, the coating deposited on Aluminum Alloy surface.In summary, we can see that has not yet been introduced in Aluminum Alloy special insulation insulation doors and windows industry standards, insulated aluminum doors and windows market appeared a worrying phenomenon, and the project owners insulated windows and doors of awareness of the new technology of insulated aluminum doors and windows is not comprehensive enough, not deep enough is the main reason for these phenomena. But we should appeal to the door and window industry people with objective scientific attitude, in order to regard product quality as the lifeline of the realm, the consumer is responsible for the professional ethics so that the disorderly competition as soon as possible to regulate.Responsible for the quality of products, responsible for the quality of people's life occupation attitude is the principle of standing trees, or even the relevant standards promulgated standards is in vain, for the quality of the product quality checks, no consciousness all become ineffective.