7176
The low powder packing density was identified as a critical reason for this .
 material: powder; machanical property: density; material: as
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, density, as 
Answer:
 material: powder; machanical property: density; material: as