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Tensile samples produced by SL and polymer-glass fiber nonwoven-polymer sandwich structures were introduced by vacuum cast , which showed a significant increase of 36 % in ultimate tensile strength and 11 % increase in stiffness .
 machanical property: Tensile; concept or principle: samples; manufacturing process: SL; material: fiber; engineering feature: sandwich structures; manufacturing process: vacuum cast; machanical property: ultimate tensile strength; machanical property: stiffness
Please list all entity words in the text that fit the category.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} 
Answer:
 machanical property: Tensile; concept or principle: samples; manufacturing process: SL; material: fiber; engineering feature: sandwich structures; manufacturing process: vacuum cast; machanical property: ultimate tensile strength; machanical property: stiffness