Volumetric flasks are an essential piece of glassware for any basic or advanced chemistry lab. They are used to hold and measure precise amounts of liquids. The 100ml volumetric flask, 3.3 boro glass, class A, ground stopper, karte is a high quality, durable, and accurate volumetric flask. This flask is made of 3.3 borosilicate glass, which is an inert and durable type of glass. The class A designation means that this flask meets the highest tolerance requirements as specified by the ASTM E-694 standard. The ground glass stopper is used to seal the flask and prevent evaporation or spills. This flask has a flat bottom, which makes it stable and easy to use. This 100ml volumetric flask is a great choice for any chemistry lab. It is precise, durable, and easy to use. The ground glass stopper ensures that your liquids are sealed in and won't evaporate or spill. The flat bottom makes this flask stable and easy to use. If you are looking for a high quality and accurate volumetric flask, this is the perfect choice for you.