Hidden coding by building materials dealers
There are many tall buildings in the city, which is a development opportunity for the building materials market. PVC pipe is the most common building material, and the quality of the pipe will directly affect the quality of life in the future.
PVC pipe, the main component is polyvinyl chloride, and other components are added to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is back-coating adhesive.
As one of the products of technological development, PVC pipes are visible in daily life. In Europe, the growth rate of plastic pipes from 1980 to 1990 was 8%. In 2001, the output reached 3.5 million tons, of which PVC pipes accounted for 60%. In the United States, the output of plastic pipes in 1985 was 1.6 million tons. In 1999, the output was about 3.6 million tons, of which PVC pipes accounted for 78%.
The first UPVV flared pipe in China was born in Shenyang Plastic Factory in 1983. Since then, mainland China has the production capacity of PVC water supply and drainage pipes. Twenty
The late 1990s was a period of rapid development of PVC pipelines in mainland China. During this period, some factories with annual production capacity of more than 50,000 tons were successively built and put into production, and there were more than 30 PVC pipe factories with production specifications of more than 10,000 tons. The annual production capacity of plastic pipes is 2 million tons. How to distinguish the quality of PVC drainage pipe?
1. Measure the wall thickness: to see if the specified wall thickness is reached, there is one more thing to note here, Some pipes are evacuated, and the wall thickness at both ends meets the requirements, but the middle wall thickness is thinner, which does not meet the requirements of use. At the same time, the cost is reduced through the method of evacuating.
2. Measure length: to see if the specified length is reached, some manufacturers reduce the price by shortening the length. According to GB/T10002.1-2006, negative deviation is not allowed.
1. Look at the gloss: the surface with good gloss and oiliness is of high quality The product.
2. Look at the color: standard high-quality PVC-U pipes are light beige. If the pipes are pale, it means that the calcium powder has been added excessively, and some manufacturers are miscellaneous and recycled. After adding too much material, the pipe will become black and yellow.
For genuine PVC pipes, there are inkjet codes, and the production batch number and other information on the inkjet codes, It can be inquired through the national professional website to avoid the phenomenon of buying inferior goods