How to judge the quality of waterproof casing?

Look at the appearance of waterproof casing, in general, the surface of high-quality waterproof casing is smooth, and the surface of poor quality is prone to scarring. This is because poor quality waterproof casing material is not good, containing a large number of impurities.
National standard type waterproof casing in full accordance with the relevant 02S404 or 02S312 standard drawing set selection and production, the flange thickness, wing ring thickness, pipe diameter and thickness have strict requirements. So rigid waterproof casing can be measured from the outside with a ruler, flexible can not be measured, you can judge according to the weight. Waterproof casing products in terms of weight because it is manufactured in accordance with the national standard weight, in terms of weight generally with the national standard will not differ by more than 5%, the general manufacturers of counterfeit products using thin steel plate rolled tube manufacturing waterproof casing, the weight of the above is far below the national standard products, especially 02S404 flexible waterproof casing series products.
Check whether there are scratches. One reason for the inferior waterproof casing is bad material. Second, the manufacturer's equipment is simple, the pipe is easy to produce burrs, scratching the steel pipe.
Waterproof casing welding position is also important, the general manufacturers use spot welding is not close enough, just a few points welded above a longer distance, check whether the welding part is full welding.
According to the internal medium of waterproof casing, choose the appropriate sealing ring material. There are generally neoprene seals, silicone rubber seals, fluorine rubber seals and corrosion-resistant EPDM rubber seals. The use of different waterproof casing sealing ring can effectively extend the service life of waterproof casing and sealing effect. Compared with the rubber seal ring sold in the market, this seal ring has a good sealing effect and corrosion resistance, high temperature resistance, in the use of the process generally does not appear rapid aging phenomenon.