Waterproof structure design services, we designed the product waterproof structure can be said to be completely no problem, but for the reasons of poor waterproof generally plastic deformation, waterproof surface is not in a line, O-ring preloading is too loose or too tight, structural stiffness is not enough, uneven screw distribution or slippery teeth, etc. The malpractice of plastic deformation is obvious and easy to occur. There are many ways to improve it, such as improving the rubber mouth, transporting water, strengthening the bone, increasing the slope of demoulding, etc. For some products, the cause of deformation may also be caused by the shape limitation leading to the need for curved surface parting of front and rear shells, or by the large change of the wall thickness of plastic parts caused by too small internal space.