GoLab Laboratory Borosilicate Glass Volumetric Flasks Wide Mouth are designed to give the best combination of thermal shock resistance, physical strength, and resistance to chemical attack. They are made to withstand the demands of the modern laboratory and are particularly suitable for all glass apparatus assemblies. Glass Material Standards Tolerance Nominal Capacity Made from 3.3 Low Expansion Borosilicate Glass At GoLab Laboratory we understand that different needs require different solutions. Hence we offer our clients a wide range of flasks, designed to meet their individual requirements, ensuring optimum quality.