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Attribute Uses:Place the chemicals to be observed,but also cover the beaker to slow the evaporation of the contents and prevent dust from entering (but not sealing). Material:PTFE Specifications:70mm diameter Caracteristique Made of high quality PTFE material,this material is resistant to acid,alkali and various organic solvents.It is almost insoluble in all solvents,and it is also resistant to high temperature. Chamfered edges are designed to effectively prevent hand scratches.There have several sizes for choice,to meet your different size request. Works great in labs,classrooms or for home experiments.Smooth and unbreakable.