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Our Volumetric Flask comes with Ground glass penny Stopper. Manufactured to class A tolerances as established by ASTM E-694, ASTM E-542, and ASTM E-288. High quality 3.3 borosilicate glass. Flat bottom volumetric Flask has a standard taper stopper made from hollow glass, and a long heavy beaded tubing neck style. Heavy Duty machine blown and reusable. Designed for great shock resistance. Flasks feature a sharp graduation line and large white block letters. Batch certified.