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Due to the adhesion incompatibility of polypropylene and untreated metals , the surface of the aluminum sheets was electrochemically micro-structured .
 machanical property: adhesion; material: polypropylene; material: metals; concept or principle: surface; material: aluminum sheets; concept or principle: electrochemically
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: adhesion, polypropylene, metals, surface, aluminum sheets, electrochemically 
Answer:
 machanical property: adhesion; material: polypropylene; material: metals; concept or principle: surface; material: aluminum sheets; concept or principle: electrochemically