The sealing of the bottle mouth and cap of the wide mouth reagent bottle is good, without the need for a bottle stopper, and it is also impermeable; Wide mouth design, easy to use, flat inner and outer walls are smooth, easy to clean, and there is no liquid residue on the inner wall of the bottle mouth. It can be cleaned in boiling nitric acid. All other concentrated, dilute, inorganic, and organic (acids, bases, esters) have no effect. Suitable for placing high concentration, high-purity, and highly corrosive drugs, chemical reagents, and standard samples. But there may be situations where the cork cannot be removed due to long-term non use. The reason is that the liquid reagent evaporates and adheres to the glass between the bottle stoppers. When encountering this situation, the following methods can be taken: