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[Chemical Knowledge]：What are the upstream raw materials for polyethylene? What do the downstream products contain?

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Polyethylene (PE) is a widely used plastic material with abundant upstream and downstream related products. The following are some upstream and downstream products related to polyethylene:

upstream products:

1. Ethylene: Polyethylene is mainly made from ethylene monomer through polymerization. Ethylene is an important basic raw material for petrochemical industry, mainly from petroleum cracking.
2. Catalyst: Polyethylene production process requires a catalyst to participate in the polymerization reaction. Common catalysts include Ziegler-Natta catalysts and chromium-based catalysts, etc.

downstream products:

1. Film: Polyethylene film is a common packaging material with excellent low temperature resistance, but poor high temperature resistance. According to different production processes, polyethylene film can be divided into LDPE film, LLDPE film, HDPE film and so on.
2. pipe: polyethylene pipe has excellent corrosion resistance, impact resistance and long life characteristics, widely used in water supply and drainage, gas transmission and other fields.
3. sheet: polyethylene sheet can be used to make all kinds of containers, bags, trays and other products, with excellent impact resistance and chemical resistance.
4. Fiber: Polyethylene fiber has the characteristics of high strength, low density, abrasion resistance, etc., and can be used to make ropes, fabrics, etc.

In short, as an important raw material for the production of chemical products, polyethylene has a wide range of upstream and downstream related products and involves many fields, which plays an important role in promoting economic development and improving people's living standards.

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