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Based on mechanical tests , the addition of glass beads increased the tensile and flexural modulus by 85 % and 36 % and lowered the tensile and flexural strength by 39 % and 15 % respectively .
 mechanical tests, glass beads, tensile, tensile, flexural strength
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:
 mechanical tests, glass beads, tensile, tensile, flexural strength