First, the material When people buy locks, they are generally worried that the locks will not be durable or the surface will rust or oxidize. This problem is related to the materials used and surface treatment issues. From a durable point of view, the best material should be stainless steel, especially as a surface material, the more bright it is. It has good strength, strong corrosion resistance and constant color. However, there are many kinds of stainless steel, which can be mainly divided into ferrite and austenite. Ferritic stainless steel has magnetic properties, commonly known as stainless steel. It takes a long time, and the environment is not good, it will rust. Only austenitic stainless steel will not rust. The identification method is very simple. It can be identified with a magnet. Copper is one of the most widely used lock materials. It has good mechanical properties, good corrosion resistance and processing properties, and its color is beautiful. Especially for copper forged handles and other locks, the surface is flat, the density is good, and there is no air hole. Sand eyes. It is both strong and rust-proof. It can be used for plating various surface treatments such as 24K gold or gold, which is magnificent, noble and generous, adding a lot of color to people's home. Zinc alloy materials have much lower strength and rust resistance, but have the advantage of being easy to make parts with complex patterns, especially for pressure casting. The locks of the more complicated patterns seen in the market are likely to be made of zinc alloy, and consumers should carefully identify them. Steel, good strength, low cost, but easy to rust, generally used as the internal structural material of the lock, not suitable for external decorative parts. Aluminum or aluminum alloy, ordinary aluminum alloy (except aerospace) is soft and light, and the material strength is lower, but it is easy to form. Second, the surface treatment Surface treatment refers to covering or forming a protective film on the surface of a part by metal electrodeposition (commonly known as electroplating), painting (called spraying), chemical oxidation (coloring) or other processing methods. The film mainly acts as a preservative, and at the same time increases the aesthetics and durability of the product, which is an important factor for directly measuring the quality of the product. Common methods for measuring surface treatment are: cover layer, thickness measurement, adhesion test, salt spray and moisture test, visual inspection, etc. The coating is applied by methods such as film adhesion, hardness, moisture test, and visual inspection. Introduction of new standards for door locks in China The new standard for door locks in China was released in June 2000 and implemented in October 2000. There are 4 national standards for original door lock products. (Including GB8385-97 "outer door lock"; GB8386-87 "ball mortise door lock"; GB8387 - "blade mortise lock" and GB8388-87 "spherical door lock" were converted into QB/ in March 1999 T3837-1999, QB/T3838-1999, QB/T3839-1999 and QB/T3840-1999 were released and implemented in 1988. However, with the continuous development of the market economy, the door lock products have undergone great changes. The variety of products is continuously enriched and the quality level is continuously improved. The original national standards and professional standards are far from meeting the requirements of the door lock quality technology under the new situation. Especially when China's accession to the WTO is imminent, economic global integration is imperative. The grade and quality of China's door lock products must be improved. In order to keep in line with international standards, in order to narrow the gap with developed countries, it is conducive to eliminating trade barriers and increasing export earnings. To promote the development of China's lock industry and participate in international competition. Therefore, the original door lock standard must be revised. The National Light Industry Bureau and the National Daily Hardware Standardization Center issued separate notices to amend the original four door lock standards and the original marble door lock (SG205-80). The external double-tongue door lock (GB8385-87) is combined to increase the double-button (tiger) door lock and become the standard for exterior door locks. The light industry standard QB currently implemented is the revised new standard. The revised principle of the new standard is: on the basis of the original standards, it can only be improved and not allowed to be reduced. It is necessary to fundamentally reverse the backwardness of China's products with low grades, low prices and poor technical standards, and adopt a careful study and a differentiated approach. The actual situation in China has been revised. In the revision process, different degrees of non-equivalent use of American ANSI (American National Standard) British BS (British National Standard) and JIS (Japanese Industrial Standards) and other foreign advanced standards as the basis. At the same time, in accordance with the requirements of national laws and regulations, combined with the actuality of the products, in the standard revision process, according to different needs, the classification requirements are made. The external door locks and the spherical door locks are divided into two categories, A and B. It distinguishes the difference between a high-class villa, an apartment, a commercial house, and a unit house. The newly revised standard requires a Class A product with higher than the original standard and exterior door locks. Its main index reaches the B level in the UK BS5872. The B grade is higher than the original Chinese standard, but lower than the B grade in the UK BS5872. (Note: Class B in the British BS standard is higher than Class A), Class A in the spherical door lock, the main indicator is close to the secondary lock level in the US ANSI/BAMA.A156.2-1996. The main indicators of the B-class products are close to the ANSI/BA, A.A156.2-1996 three-level lock level, and a lot higher than the original Chinese standard. Therefore, China's revised new standard QB/T2473-2000, QB/T2475-2000, QB/T2474-2000 and QB/T2476-2000 are higher than the original standard. Roller Shutter Opener Accessories Roller Up Door Motor,Roller Shutter Door Opener,Roller Shutter Opener Accessories,Roller Shutter Door Electric Motors GUANGDONG BEIDI SMART SCIENCE & TECHNOLOGY CO LTD , https://www.beidimotor.com