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Infrared preheating proved to be very effective when applied to substrates that had cooled considerably , almost doubling the tensile strength and increasing the fracture toughness by a factor of 7x .
 concept or principle: Infrared; material: be; machanical property: tensile strength; concept or principle: fracture
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: Infrared, be, tensile strength, fracture 
Answer:
 concept or principle: Infrared; material: be; machanical property: tensile strength; concept or principle: fracture