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We demonstrate that a low dielectric constant composite filament , useful for FFF printing , can be manufactured by combining a base thermoplastic polymer with hollow microspheres and a plasticizer .
 machine or equipment: dielectric; material: composite; manufacturing process: FFF; material: be; material: thermoplastic polymer; concept or principle: microspheres; material: plasticizer
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: dielectric, composite, FFF, be, thermoplastic polymer, microspheres, plasticizer 
Answer:
 machine or equipment: dielectric; material: composite; manufacturing process: FFF; material: be; material: thermoplastic polymer; concept or principle: microspheres; material: plasticizer