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There are two fundamental varieties: glass and plastic. Lab Flask MaterialsĪdditionally, laboratory flasks can be classified by their construction material. for chemical reactions or other operations like mixing, heating, chilling, dissolving, precipitating, boiling (as in distillation), or analysis. Flasks can be used for holding, containing, collecting, or occasionally volumetrically measuring chemicals, samples, solutions, etc.Flasks that do not feature such stoppers or caps may be capped using a cork stopper or rubber bung.Typically, glass stoppers feature a matching tapering inner (or male) ground glass joint surface, but typically only stopper-grade glass.These stoppers may be made of plastic or glass. Some flasks, particularly volumetric flasks, include a rubber stopper, bung, or cap for capping the opening at the top of the neck.Some glass flasks, such as round-bottom flasks, retorts, and occasionally volumetric flasks, have outer (or female) tapering (conical) ground glass joints at the opening(s) at the top of the neck.Traditionally, laboratory flasks were constructed of glass, however plastic can also be used.The capacity of laboratory flasks is normally given in metric units such as millilitres (mL or ml) or litres (L or l).

There are a variety of flask forms and sizes, but one defining feature is a broader vessel “body” and one (or sometimes more) narrower tubular pieces at the top called necks that have an opening at the top.In the laboratory and other scientific contexts, flasks are typically referred to as flasks. Glassware is the category of laboratory equipment that includes laboratory flasks.