Flexible waterproof casing filling materials are; Asphalt hemp, polystyrene board, polyethylene plastic foam board, sealing paste: polysulfide sealing paste, polyurethane sealing paste. The sealing ring is rubber. Rigid waterproof casing filling cotton in line with GB/T8071-2001 standard 4 or above machine temperature cotton. Flax should be used with longer fiber, no cortex, clean, rich toughness of flax. Cement shall be Portland cement in accordance with GB/T175, no less than 425. The market now are more diverse, flexible waterproof casing in addition to the national standard of waterproof casing, other than mark waterproof casing without a corresponding standards, manufacturers cut prices in order to reduce the cost, thickness and standard for the product, too, fell, so when the choose and buy a product to ask the thickness of the product, the thickness of the different prices also different. Extended-type flexible waterproof sleeve is generally applicable to the pipe through the wall of vibration or strict waterproof requirements of the structure; Rigid waterproof casing is generally suitable for pipe through the wall of the general waterproof structure; For the wall where the flexible and rigid waterproof bushing penetrates the wall, if it is not concrete, the concrete wall shall be used, and the bushing must be solidified in the wall at one time; Waterproof casing is used in construction, chemical, steel, tap water, sewage treatment units. Under normal circumstances, the material used in the production of the product is the use of Q235 carbon steel, which belongs to the commonly used material. Users who know a little about the material know, and can roughly see the difference between carbon steel and cast iron from the appearance.

02S404 flexible waterproof casing standard basically users know is the national standard, order directly said "to the national standard" manufacturers know what kind of standard, S312 standard is known as the near standard, in fact, in general, the two standards are the same as the design and research institute, but the former indicators and parameters are better than the latter, So the habitual use of national standard and near standard as a distinction.

Waterproof casing installed in a room with water can effectively ensure the safety and stability of the pipeline, the main is to prevent water leakage, between the upper and lower floors of the building pipe must be installed at the product. First, after the pipeline across the floor, some construction personnel for the convenience of save trouble, not to the civil mode, only a simple block after filling the holes with cement mortar, combined with the hard PVC tube seem more smooth, and the concrete bonding is not very strong, so very easy to cause serious water seepage phenomena of the floor slab, affect the normal household use. The correct approach is: casing in advance, the end of pipeline installation should cooperate with civil construction to support the mold, and should use C20 fine stone concrete pouring and compaction. After pouring, combined with the construction of leveling layer or surface layer, a water-blocking ring with a thickness of no less than 20 mm and a width of no less than 30 mm should be built around the pipeline.