Basic requirements for anti-static in factories

I. Static Electricity Protection A. Inhibit the accumulation of static charges; B. Static electricity can quickly, safely and effectively eliminate the static charges that have already been generated. Ii. Anti-static work area 1. Floor materials: A. It is prohibited to directly use wooden floors or lay wool, linen, chemical fiber carpets and ordinary floor coverings. B. The floor should be made of electrostatic conductor materials, such as anti-static raised floors or anti-static floor MATS should be laid on ordinary floors and effectively grounded. C. The use of specially treated terrazzo floors is permitted, such as laying a ground wire mesh in advance, carburizing or spraying antistatic agents on the floor, etc. 2. Grounding A. The anti-static system must have an independent and reliable grounding device. The grounding resistance is generally less than 10Ω, and the installation and detection methods should comply with the requirements of GBJ 97. B. The anti-static ground wire must not be connected to the power neutral wire and must not be shared with the lightning protection ground wire. C. When using a three-phase five-wire power supply system, the ground wire can be used as an anti-static ground wire (but the neutral wire and the ground wire must not be mixed). D. The cross-sectional area of the grounding main line should be no less than 100mm ². The cross-sectional area of the branch trunk line should not be less than 6mm ². The grounding wires for equipment and workbenches should be multi-strand plastic-coated conductors with a cross-sectional area of no less than 1.25mm ². The color of the grounding wire is preferably yellowish-green. E. The connection method of the grounding main line should adopt brazing. F. The connection terminals of anti-static equipment should ensure reliable contact, be easy to install and disassemble, and allow the use of various clamp-on connectors, such as alligator clamps, plugs and sockets, etc. 3. Ceiling materials: Ceiling materials should be made of anti-static materials. Generally, gypsum board products are allowed, but ordinary plastic products are prohibited. 4. Wall fabric: Anti-static wallpaper should be used for the wall fabric. Generally, gypsum paint or lime paint is allowed for the wall surface, but ordinary paint is prohibited Wallpaper and plastic wallpaper. 5. Humidity Control A. The relative humidity of the anti-static working area should be no less than 50%. B. Under the premise of not causing harmful effects on the product, it is permitted to use humidifying equipment to spray the formulation or water to increase the environmental humidity. C. The humidity in the computer room should comply with the relevant provisions in GB 2887, and similar computer rooms should also conform to this regulation. 6. Anti-static work areas should be clearly marked with boundaries and warning signs should be hung in prominent places. The warning signs should comply with the provisions of GJB1649. Ionized air bath equipment should be provided at the entrance of the work area. 7. Charge Sources IV. Use and Management of Anti-static Work Clothes: It is prohibited to use or come into contact with charge sources that can easily generate static electricity in the anti-static work area. Workbench surface, painted or dipped surface, ordinary plastic veneer, ordinary ethylene and resin surface floor, plastic and ordinary floor leather, polished and waxed wooden floor. Ordinary ethylene resin work clothes, hats, shoes, ordinary polyester, synthetic fiber and nylon fabrics, plastic and ordinary rubber-soled shoes, operation tools and equipment, ordinary plastic boxes, racks, bottles, plates and paper products, ordinary foam and general mobile tools, compressors, spraying equipment, evaporation equipment, etc Iii. Anti-static Facilities for Electronic products 1. Electrostatic Safety Workbench A. The electrostatic safety workbench is a fundamental component of the anti-static work area. It consists of a workbench, anti-static table MATS, wrist strap connectors, and grounding wires, etc. There should be no less than two wrist strap joints on the anti-static tablecloth, one for the operator and the other for technicians, inspectors or other personnel. C. When necessary, an ion wind static eliminator should be equipped on the static safety workbench. D. On the electrostatic safety workbench, it is not allowed to stack plastic boxes (sheets), rubber, cardboard, glass and other items that are prone to generating static electricity. Drawings and materials should be placed in anti-static file bags.
2. Anti-static wristbands: All personnel who come into direct contact with electrostatic sensitive devices should wear anti-static wristbands. The wristbands should have good contact with human skin and must not cause irritation or allergic reactions to the human body. The resistance value of the wristband system to ground should be within the range of 106 to 108Ω.
3. Anti-static containers: During the research and production of electronic equipment, all containers used for storing and turnover SSDS (such as component bags, transfer boxes, printed circuit board racks, component storage boxes, etc.) should have anti-static protection performance. Metal and ordinary plastic containers are not allowed. When necessary, the turnover boxes used for storing components should be grounded.
4. An ion wind static electricity eliminator should be used to eliminate static charges on the surface of insulating materials.
5. Anti-static work clothes A. Personnel entering the anti-static work area or in contact with SSDS should wear anti-static work clothes. The fabric of the anti-static work clothes should comply with the provisions of GB 12014. B. In an environment with a relative humidity greater than 50%, anti-static work clothes are allowed to be made of pure cotton.
6. Anti-static work shoes: Personnel entering the anti-static work area or in contact with SSDS should wear anti-static work shoes, which should comply with the relevant provisions of GB 4385. Under normal circumstances, ordinary shoes are allowed, but conductive shoe straps or heel straps should be used at the same time.
7. When transporting SSDS or whole components containing SSDS, anti-static transport vehicles should be used.