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The optimal slurry composition was composed of 50vol. % Al2O3 loading , 1.5wt. % acetic acid as dispersant and 2wt. % methylcellulose solution as binder .
 material: slurry; concept or principle: composition; material: Al2O3; material: as; concept or principle: solution; material: as
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: slurry, composition, Al2O3, as, solution, as 
Answer:
 material: slurry; concept or principle: composition; material: Al2O3; material: as; concept or principle: solution; material: as