Polyethylene is a polymer plastic that can be shaped by melting it and molding it. Polyethylene is obtained from the polymerization of colorless gas ethylene (C2H4).
The most obvious characteristic of polyethylene is its molecular mass and density. One of the most important advantages of using polyethylene is its recyclability and plasticity by melting it. Polyethylene is used in various ways, especially in the production of all kinds of plastic accessories and pipes.
Polyethylenes are divided into two categories: heavy polyethylene (MDPE) and light polyethylene (LDPE). Heavy duty polyethylene (MDPE) is the most widely used and common type of plastic. This polymer has a compact and unbranched molecular chain, that is why it has high density and little flexibility.
Heavy polyethylene has a matte white color and can be made by adding pigment to the raw materials. used different colors. They are electrically insulating and have high chemical resistance. Also, due to its high crystallinity, it has the lowest permeability and the highest amount of hardness and high resistance to corrosion. did.
Light polyethylene (LDPE) has a branched molecular chain and low density as well as a weak molecular force, therefore it has high flexibility and low tensile strength. The applications of this polymer are making transparent tarpaulins, covers and suitcases, packaging liners and pressurized bottles. After learning about polyethylene, you can define polyethylene pipe. As the name of polyethylene pipe indicates, it is a pipe made of polyethylene without other additives such as granules. These pipes, like other pipes, have the task of transferring fluid from one point to another. Today, polyethylene pipes have become very popular in the industry due to their many advantages, including light weight, beautiful shape, high flexibility, and very low cost, and have been able to take the place of metal, cast iron, and concrete pipes.
These pipes are widely used in water supply and irrigation. These pipes are divided into three grades PE63, PE80 and PE100 based on the thickness and the amount of pressure that can be tolerated. Today, the PE63 grade is rarely used. Also, these pipes are divided into single-walled and double-walled (carogate) categories based on the type of construction.
Types of polyethylene pipes
The materials used in making polyethylene pipes are different from the materials used in other polyethylene products. Choosing the right polyethylene pipes, according to the required application, is very important, so it is necessary to have enough information about the types of these pipes.
These pipes are divided into three grades. PE63 grade is not economical due to its thickness and high weight, and today this type of polyethylene is not used. PE80 grade is lower than PE63 grade in terms of weight, thickness and price. Also, in this grade, with the increase in density, the amount of pressure to bear has increased. Made using the best raw materials, the PE100 grade has less weight and thickness than the previous two grades, and its most important advantage is that the ultraviolet and sun rays do not affect this type of pipe.
These pipes Based on the type of construction, they are divided into two categories, single-walled and double-walled. Single-walled polyethylene pipes can be used at pressures between 2 and 40 atmospheres. With the development of new technologies and the production of higher quality materials, the use of these types of pipes in water supply and irrigation networks has increased. Temperature, chemicals and impact. Also, these pipes can withstand pressure from 6 to 32 atmospheres. Due to the distinctive characteristics of double-walled polyethylene pipes, they are used in the agricultural industry and the transfer of industrial liquids and water at high pressure and uneven surfaces.