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Polyolefin thermoplastics like high density polyethylene ( HDPE ) are the leaders in terms of world-scale plastics ’ production , environmentally benign polymerization processes , recycling , and sustainability .
 material: Polyolefin thermoplastics; material: high density polyethylene; material: HDPE; material: plastics; manufacturing process: production; manufacturing process: polymerization; concept or principle: recycling; concept or principle: sustainability
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: Polyolefin thermoplastics, high density polyethylene, HDPE, plastics, production, polymerization, recycling, sustainability 
Answer:
 material: Polyolefin thermoplastics; material: high density polyethylene; material: HDPE; material: plastics; manufacturing process: production; manufacturing process: polymerization; concept or principle: recycling; concept or principle: sustainability