In the past, pipes used for water supply were mainly cast iron pipes. Sand cast iron pipes are mainly used outdoors, and galvanized iron pipes are used indoors. They can be divided into cold (electric) galvanized and hot galvanized. The galvanized pipe is used as a water pipe. After a few years of use, a large amount of rust is generated in the pipe. The outflow of yellow water not only pollutes the sanitary ware, but also contains bacteria that grow on the rough inner wall. Corrosion causes excessive levels of heavy metals in the water and seriously harms human health. The state has stipulated that sand mold casting fittings and cold galvanized cast iron fittings should be eliminated from June 1, 2000. The use of hot-dip cast iron pipes should be gradually restricted, and aluminum-plastic composite pipes and new-type plastic pipes should be promoted. Therefore, there are three major categories of pipelines currently in use. The first category is metal pipes, such as hot-dip cast iron pipes, copper pipes, stainless steel pipes and so on. The second category is plastic compound metal pipes, such as plastic compound steel pipes and aluminum plastic composite pipes. The third category is plastic pipes, such as PP-R (cross-linked polypropylene high density mesh engineering plastics). (1) Aluminum plastic composite pipe Aluminum-plastic composite pipe is one of the more popular pipes in the market. It is light, durable, and convenient to construct. Its flexibility is more suitable for home use. The main drawback is that when used as a hot water pipe, due to long-term thermal expansion and contraction, it may cause misalignment of the snap-on connection and cause leakage. There are many varieties of aluminum-plastic composite tubes currently sold on the market, and the quality and price vary greatly. How to buy aluminum-plastic composite pipes has become a headache for consumers. 1 check the appearance of the product The high quality aluminum composite pipe generally has a smooth outer wall. The logo, specifications, applicable temperature, and number of meters on the pipe wall are clearly identified. The manufacturer also prints the production number on the pipe wall so that the product quality can be monitored at any time; the product packaging is excellent and the packaging is excellent. All kinds of logos are also clear. Manufacturers' names, addresses, telephone numbers, etc. are all printed in prominent positions. The shoddy products generally have rough outer walls, unclear or incomplete labels, simple packaging, and unclear site or telephone calls. 2 aluminum layer can not be ignored A good aluminum-plastic composite pipe is welded at the overlap of the aluminum layer, and the aluminum layer and the plastic layer are closely combined without stratification. The shoddy products have aluminum layers that are not welded, and some aluminum layers and plastic layers are often layered and not tight. Hidden Project Villa Decoration Villa Design Stainless Steel Home Improvement Villa Exterior Villa Villa Area 
Zhongde Weikang water pipe
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