1604
The EVA resin was then characterized in terms of its thermal behaviour , density , porosity , average pore size .
 material: resin; machanical property: density; machanical property: porosity; concept or principle: average
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:
 material: resin; machanical property: density; machanical property: porosity; concept or principle: average