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Metal powder recyclability has been studied before with respect to change in chemical composition of powders , effect on mechanical properties of produced parts , effect on flowability of powders and powder morphology .
 material: Metal powder; concept or principle: chemical composition; material: powders; concept or principle: mechanical properties; material: powders; material: powder; concept or principle: morphology
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: Metal powder, chemical composition, powders, mechanical properties, powders, powder, morphology 
Answer:
 material: Metal powder; concept or principle: chemical composition; material: powders; concept or principle: mechanical properties; material: powders; material: powder; concept or principle: morphology