The pros and cons of many products can be identified with the naked eye, but many of the parameters require more detailed product is the need for more screening methods to be detected. Buy aluminum products to your Weapon, so nowhere to hide poor quality aluminum products, insulation and your home life. Aluminum prices are generally inferior low, and will have a class of continuity: a thin oxide film thickness. National standards for architectural aluminum oxide film thickness of not less than 10um (micron). Thick enough, aluminum surface is easy to rust, corrosion. Sample testing of some proletarian name, address, production license, certificate of aluminum, oxide film thickness of only 2 to 4um, some did not even oxide film. According to expert estimates reduced by 1um oxide film thickness, profiles can reduce the power consumption per ton cost more than 150 yuan. Like sand through the solar surface aluminum surface oxidation treatment, not easy to rust and corrosion of the aluminum oxide film thickness profiles in 15u generally above. Chemical composition of broken insulation http://www.zgpal.com failed. The incorporation of a large number of miscellaneous aluminum, scrap aluminum can greatly reduce costs, but will lead to the chemical composition of aluminum construction failure, seriously jeopardize safety in construction. Reduce the wall thickness profiles. 90 series of sliding type, according to the national standard which is not less than the minimum wall thickness of aluminum 1.4mm, Guangdong some products are only 0.6 to 0.7mm. 46 series of bomb door type, the minimum national standards for the use of aluminum wall thickness not less than 1.62mm, sampling, Guangdong, some of the products only from 0.97 to 1.18mm. A significant reduction in low-grade aluminum closure time and reduce the loss of chemical reagents, cost reduction, but the corrosion resistance profiles also greatly reduced. For perennial procurement staff, aluminum is particularly important to distinguish, but the most direct is a summary of the experience, for the procurement of new people, because the experience is not in place, to find some qualified companies, the strength of enterprises can reduce unnecessary loss.