1435
This porosity requests a post-treatment by infiltration to harden the final model like the bronze use to the steel .
 machanical property: porosity; manufacturing process: post-treatment; concept or principle: infiltration; concept or principle: harden; concept or principle: model; material: bronze; material: steel
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:
 machanical property: porosity; manufacturing process: post-treatment; concept or principle: infiltration; concept or principle: harden; concept or principle: model; material: bronze; material: steel