Our boiling flasks are made from low-expansion borosilicate glass. Feature uniform wall thickness for superior mechanical strength and shock resistance. Ideal for boiling, heating and mixing in the laboratory. Additional Info: Boiling Flask, Flat Bottom, Borosilicate Glass, 50ml, Pk/6 Package Size(L x W x H): 6.5 X 4.5 X 4 (IN) Categories: Flasks, Glass HTS Code: 7017.90.5000 UNSPSC: 4.11218e+007 Country Of Origin: INDIA