5231
The post processing reduced the breaking force of the samples , but it increased the ultimate tensile strength and elongation at break .
 post processing, force, samples, ultimate tensile strength, elongation
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:
 post processing, force, samples, ultimate tensile strength, elongation