900
In addition , by fabricating a very thin wall heat exchanger ( 150 μm ) , the wall thermal resistance , which usually becomes the limiting factor on polymer heat exchangers , was calculated to account for only 3 % of the total thermal resistance .
 manufacturing process: fabricating; machine or equipment: heat exchanger; machanical property: resistance; material: polymer; machine or equipment: heat exchangers; machanical property: resistance
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:
 manufacturing process: fabricating; machine or equipment: heat exchanger; machanical property: resistance; material: polymer; machine or equipment: heat exchangers; machanical property: resistance