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The surface coating of fibers can effectively reduce the viscosity , which is an advantage which allows processing of resins with higher fiber concentrations .
 concept or principle: surface; application: coating; material: fibers; machanical property: viscosity; material: resins; machanical property: fiber concentrations
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: surface; application: coating; material: fibers; machanical property: viscosity; material: resins; machanical property: fiber concentrations