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The foremost prominence of Titanium alloys is excellent strength to weight ratio , high weathering resistance , and admirable characteristics involving high tensile strength and toughness with comparatively low electrical and thermal conductivity .
 material: Titanium alloys; machanical property: strength to weight ratio; machanical property: weathering resistance; machanical property: tensile strength; machanical property: toughness; application: electrical; machanical property: thermal conductivity
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: Titanium alloys, strength to weight ratio, weathering resistance, tensile strength, toughness, electrical, thermal conductivity 
Answer:
 material: Titanium alloys; machanical property: strength to weight ratio; machanical property: weathering resistance; machanical property: tensile strength; machanical property: toughness; application: electrical; machanical property: thermal conductivity