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The results indicate that the sintering temperature and time might be tailored to achieve target densities anywhere in the range of 64 % and 91 % , with possibly higher densities by increasing sintering time .
 sintering, be, range, sintering time
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:
 sintering, be, range, sintering time