9191
Glass sphere-filled polycarbonate is investigated by varying nozzle and filler diameters , the resin viscosity , the filler content , and the extrusion pressure .
 Glass, polycarbonate, nozzle, resin, extrusion pressure
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 Glass, polycarbonate, nozzle, resin, extrusion pressure