Waterproof casing national standard and non-standard waterproof casing what is the difference?

Because of the waterproof casing because of the unregulated competition in the market, the classification of flexible waterproof casing can be divided into: national standard and non-standard according to the standard atlas. National standard waterproof casing refers to the selection and production of materials in full accordance with the Ministry of Construction's relevant 02S404 or 02S312 standard atlas, with strict requirements for flange thickness, wing ring thickness, pipe diameter and thickness. Non-standard is in the shape and approximate structure in line with the standard atlas, by the manufacturer or customer regulations independent production of waterproof casing goods, the selection of materials for flange thickness, wing ring thickness, pipe diameter and thickness that relaxed requirements. The manufacturing of national standard and non-standard flexible waterproof casing is different. Even in the workmanship of the national standard flexible waterproof casing including welding process, appearance are better than non-standard, so the price of non-standard waterproof casing is cheaper than the national standard, but the use of basically the same. However, excessive relaxation of standards will affect the use of performance: life than the national standard products. The national standard product water stop wing change compared to non-standard outer diameter also has a difference, the national standard wing ring outer diameter is large so that it can be very better fixed in the wall body.
In some buildings where the requirements are not very strict, non-standard waterproof casing will be used. Homemade standards are more for the work needs of manufacturers, in order to largely reduce costs to choose a reputable waterproof casing manufacturers of non-standard waterproof casing is also a normal trend.