<p>corrosion resistance, and easy molding, used for mid-range lock. Two see surface treatment surface treatment can be divided into three kinds of spraying and electroplating, coloring, surface treatment by forming a layer of compact protective film on the surface of the product, have antiseptic and anti rust effects, make the product more beautiful and durable. At the same time, it is also a standard to measure the quality of products. The quality locks are treated by </p>
<p>electroplating. The coating is exquisite, smooth, even and medium. The color is bright, without bubbles, rust and oxidation. Three, the implementation of standards, foreign hardware locks have very strict standards and regulations, so the quality of imported products is relatively higher. At present, the Ministry of light industry has some reference to foreign standards of the original implementation of the revised GB into the current higher requirements of QB, the </p>
<p>brand manufacturers have in the implementation of QB standards, small manufacturers are still in the implementation of existing GB standards, in the purchase must understand the implementation of standard products. Four see feel generally, the feeling of heavy lock, quality is relatively high; the lock body can not be dew point dew point, easy to hurt, especially should pay attention to the end of a lock tongue and a lock handle, a lock body four angle three </p>
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