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