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"Polyethylene (PE) is the simplest plastic chemically speaking. Because of this, its manufacture is very economical and this makes it one of the most common plastics with millions of tons manufactured each year. It is a thermoplastic that is created by the polymerization of ethylene. Many types of polyethylene are known and are often mixed with organic compounds. Ethylene polymerizes when it comes into contact with catalysts. It is a conversion that releases a lot of heat (exothermic conversion). One of the most common catalysts is called Ziegler-Natta catalysts. Some characteristics of polyethylene are the following: Polyethylene is hardly reactive because it is chemically inert. It is translucent and whitish. At normal temperatures it is a resistant and flexible material. It is a poor conductor of electricity and heat. Its melting point is between 100-146 ° C and its density in solid state varies according to temperature. Depending on the product to be produced, different processes can be used: extrusion (cables, wires ...), injection molding (3D parts with difficult shapes), extrusion and blowing of hollow bodies (bottles of various sizes) ... As the density of polyethylene varies, 2 types can be differentiated according to their density and hardness: Low density polyethylene (LDPE / LDPE): used for many products such as bags, knobs, food containers…. High-density polyethylene (HDPE / HDPE): its hardness and density is higher. It is used among others for drums, gas pipes…. Polyethylene is a very versatile plastic and has many applications. It is used to produce: wires, cables, bottles, plastic bags, containers for detergents…. Polyethylene is produced from ethylene that is obtained mainly from oil and natural gas. As it is not easily biodegradable, it accumulates in landfills. For this reason, recycling is very important. In this way, pollution would be reduced and the environment would be helped. "

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