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Polyvinylidene fluoride ( PVDF ) is a polymer prized for its unique material properties , including a high resistance to corrosive acids such as HCL and HF and its piezoelectric potential based on the proper microstructure arrangement .
 material: polymer; concept or principle: material properties; machanical property: resistance; machanical property: corrosive; material: as; material: HF; concept or principle: microstructure
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: polymer, material properties, resistance, corrosive, as, HF, microstructure 
Answer:
 material: polymer; concept or principle: material properties; machanical property: resistance; machanical property: corrosive; material: as; material: HF; concept or principle: microstructure