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It was found that despite issues with high porosity , heat treated specimens had a lower electrical resistivity than other common AM materials such as the aluminium alloy AlSi10Mg .
 machanical property: porosity; concept or principle: heat; process characterization: electrical resistivity; material: AM materials; material: as; material: aluminium alloy AlSi10Mg
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: porosity, heat, electrical resistivity, AM materials, as, aluminium alloy AlSi10Mg 
Answer:
 machanical property: porosity; concept or principle: heat; process characterization: electrical resistivity; material: AM materials; material: as; material: aluminium alloy AlSi10Mg