Thin oxide film thickness. National standards for architectural aluminum oxide film thickness shall be not less than 10um (micron). Thick enough, the aluminum surface is easily corroded, corrosion. Testing some of the middle name, site, production license, certificate of aluminum oxide film thickness of only 2 to 4um, and some do not even have the oxide film. According to expert estimates that each reduction of the 1um oxide film thickness, per ton of profiles can reduce the cost of power consumption over 150 yuan.
The chemical composition failed. Incorporation of a large number of miscellaneous aluminum scrap aluminum can greatly reduce costs, but will result in the architectural aluminum chemical composition failed to seriously jeopardize the safety of construction works.
Lower profile wall thickness. 90 series of sliding type, according to national standard Standard aluminium profile wall thickness of a minimum of not less than 1.4mm, the number of Guangdong products only from 0.6 to 0.7mm. 46 series of bomb doors type, the lowest national standard aluminum wall thickness not less than 1.62mm, sampling, some of the products in Guangdong is only 0.97 to 1.18mm.
A large number of low-quality aluminum to reduce the closing time, to reduce the loss of chemical reagents, cost reduction, but the profiles resistant to corrosion greatly reduces.
没有评论:
发表评论