... :Place of Origin: China2:Material:heat resistant 3.3 borosilicate glass , heavy wall.3:Size: capacity(ML):5,, 10,, 25,, 50 ... ,,150, ,250,, 500,, 1000,, 2000,, 3000,, 5000,, 10000,, 20000,, 50000 joint:14/20,,14/25,,19/22,,19/28,,24/30 ... application:for scientific research, teaching, medicine, and petroleum chemical industries. glass flat bottom flask(chemistry flask)