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Connectors may be susceptible to ingress of foreign materials such as moisture or dust, particularly in the unmated condition. Protection from this ingress is provided for connectors by their housing and the seal between the plug,jack,and cable or between a jack and a panel. The IP standard rating system defines the degree of protection provided. The standard IEC 60529 has specified the degree of protection and divided it into several levels, defined by the IP number, which has the letters IP by two digits. The first digit defines the protection against the ingress of dust particles, the second digit defines the protection against the ingress of water. The tables below show IP ratings for electrical connectors:
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Silicone button waterproof, which means directly fix the silicone button with PCB board or bracket screw on the plastic top cover. When making this structure, the spacing of the screw column should be uniform. Because the plastic parts, Buttons and PCB board have large elastic deformation after being stressed, it is necessary to ensure the rigidity of the structure of plastic and circuit board as far as possible, so that the elastic change can be reflected on the keyboard as far as possible. The thickness of plastic wall should not be thin, the screw post should have reinforced bone, and the number of screw posts for fixing circuit boards should be enough. The material of PCB should be Bakelite board or rigid fiberboard. The thickness should be more than 1.6 mm. If necessary, a steel plate can be padded in the PCB and keyboard.
The sealing of buttons can also be divided into side pressure and positive pressure. The sealing structure is related to ID and the button types. Side pressure is generally "U" groove seal. The silicone gel of buttons grows out of the convex platform and is inserted into the "U" groove of shell A in order to achieve seal. The positive pressure seal is through Silicon (silica gel) skirt edge with a sealing line and A shell positive pressure to seal. Designers should pay attention to ensure the smoothness and uniform force of the mating surface. No ejector pin or diagonal pin shall be allowed at the matching surface of the die. Sealing line is as simple as possible, large rounded corner is excessive to ensure smooth contour.
