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Which of these is not a type of polyethylene?

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Which of these is not a type of polyethylene?

(a) Low-density polyethylene

(b) High-density polyethylene

(c) Linear high-density polyethylene

(d) Ultra-high molecular weight polyethylene

The question was posed to me in an internship interview.

Asked question is from Thermoplastics in chapter Non Metallic Materials of Engineering Material & Metallurgy

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The correct choice is (c) Linear high-density polyethylene

Easiest explanation: Polyethylene is a plastic made by the polymerization of ethylene (ethene). Based on molecular weight, the method of manufacturing, and density, they are classified into various types. Low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), and ultra-high molecular weight polyethylene (UHMWPE) are the four types of polyethylene.

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