8286
Nevertheless , there were significant differences in porosity , which probably depended on the properties of the materials used , both with and without carbon fibres , thus causing significant differences in light absorption and heat conductivity .
 porosity, properties, materials, carbon fibres, absorption, heat conductivity
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:
 porosity, properties, materials, carbon fibres, absorption, heat conductivity