8547
In this paper , the authors present evidence of printing poly ( phenylene sulfide ) ( PPS ) , a high-performance polymer , via powder bed fusion ( PBF ) using a bed temperature of 230 °C , which is significantly below both its observed melting temperature ( Tm ˜ 285 °C ) and its observed onset temperature of crystallization ( Tc ˜ 255 °C ) .
 material: polymer; manufacturing process: powder bed fusion; manufacturing process: PBF; machine or equipment: bed; process parameter: melting temperature; process parameter: temperature; concept or principle: crystallization
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: polymer, powder bed fusion, PBF, bed, melting temperature, temperature, crystallization 
Answer:
 material: polymer; manufacturing process: powder bed fusion; manufacturing process: PBF; machine or equipment: bed; process parameter: melting temperature; process parameter: temperature; concept or principle: crystallization