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In contrast , heat-exposed PET powder , after 96 h at 210 °C , could be used , without refreshing with a portion of virgin powder .
 material: powder; material: be; material: virgin powder
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: powder, be, virgin powder 
Answer:
 material: powder; material: be; material: virgin powder