6900
The investigations in this study aims at the influence of processing time and temperature on molecular changes and thermal properties of polyamide 12 partcake material in selective laser sintering .
 process parameter: temperature; concept or principle: thermal properties; material: polyamide 12; material: material; manufacturing process: selective laser sintering
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: temperature, thermal properties, polyamide 12, material, selective laser sintering 
Answer:
 process parameter: temperature; concept or principle: thermal properties; material: polyamide 12; material: material; manufacturing process: selective laser sintering