Boston round bottles mostly refer to chemical vessels with a small mouth, large body, and bottom. They are used for the storage of solvents, chemicals, or samples. Type III soda-lime glass can be capped or not. There are different kinds of caps, such as black phenolic resin caps and white polypropylene caps. The bottle is colorless or brown. Boston round bottle is one of the most popular bottle types. The standard narrow bottle mouth can be combined with a variety of sealing methods, such as emulsion pump, sprayer, screw cap, dropper cover, and more.
Glass and plastic Boston bottles range from 0.5 oz or less to 32 oz or more. Boston bottles are with closure size 18/400, 20/400, 22/400, 24/400, 28/400. Boston bottles usually don't have the same caliber, so it's challenging to match caps. Boston round bottles cannot have tamper-proof caps due to the lack of compatible switching rings.