Round Bottom Flask 1.Hand-crafted; 2.Material:Borosilicate 3.3 glass; 3.Certificate:ISO9001-2000; 4.Welcome OEM orders. Round Bottom Flask 1.Materilal: Borosilicate glass 3.3 glass.2.Application: Used in the chemical industry, petrochemical industry, electronic chemistry, biochemical pharmaceuticals, laboratory and education.3.We offer OEM service, customized design, logo/brand and packaging are ...