Best Stonylab Lab Boiling Flasks in 2026

STANDARD SIZE--- This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 2000mL.

HEAT-resistance DESIGN ---With spherical bottoms,this RBF is more resistance to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. Laboy glass flasks are heavy wall designed,made by hand-blowing to ensure uniform wall thickness, made of high-quality borosilicate glass and annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling.

WIDELY USED----The round bottom flask is widely used in organic chemistry,in a or vacuum apparatus ,it’s used a a flask and receiving flask with a glass condenser and some adapters like the 14 way adapter,take-off adapter;In a reflux process,it’s used as a reaction flask with a reflux condenser.It is also used as a flask in rotary evaporators.

STANDARD SIZE--- This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 1000mL.

HEAT-resistance DESIGN ---With spherical bottoms,this RBF is more resistance to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. Laboy glass flasks are heavy wall designed,made by hand-blowing to ensure uniform wall thickness, made of high-quality borosilicate glass and annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling.

WIDELY USED----The round bottom flask is widely used in organic chemistry,in a or vacuum apparatus ,it’s used a a flask and receiving flask with a glass condenser and some adapters like the 14 way adapter,take-off adapter;In a reflux process,it’s used as a reaction flask with a reflux condenser.It is also used as a flask in rotary evaporators.

DESIGN----Round bottom design having spherical bottoms are more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. A cork stand is needed to keep the round bottom flask upright,or heated by the water bath ,oil bath or sand bath.Comparing to the single neck round bottom flask,this 2 neck flask featured an angled neck with standard taper joint as an extra opening.

WIDELY USED---The 2 neck round bottom flask is widely used in the organic chemistry process, reflux ,extraction,reaction etc.In a apparatus,the 2 neck round bottom flask used as the flask,the straight neck attaches a 3 way adapter or a column,the other neck can be used to connect a thermometer adapter ,bleeding tube, or additional funnel.

DIMENSIONS-----This 2 neck round bottom flask has capacity of 1000mL, with 24/40 center joint & 24/40 side joint,attaching any lab glassware apparatus with standard taper joint.

DESIGN----Round bottom design having spherical bottoms are more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. A cork stand is needed to keep the round bottom flask upright,or heated by the water bath ,oil bath or sand bath.Comparing to the single neck round bottom flask,this 2 neck flask featured an angled neck with standard taper joint as an extra opening.

WIDELY USED---The 2 neck round bottom flask is widely used in the organic chemistry process like distillation, reflux ,extraction,reaction etc.In a distillation apparatus,the 2 neck round bottom flask used as the distillation flask,the straight neck attaches a 3 way distillation adapter or a distillation column(in fractional distillation),the other neck can be used to connect a thermometer adapter ,bleeding tube, or additional funnel.

DIMENSIONS-----This 2 neck round bottom flask has capacity of 2000mL, with 24/40 center joint & 24/40 side joint,attaching any lab glassware apparatus with standard taper joint.

DESIGN----The flat bottom flask is likely the round bottom flask but with a flat bottom allowing it standing up flat surface as the flask can sit upright on its own,rather than in a flask clamp or cork stand,ideal for using as a receiving flask.When under heating,it is not durable as round bottom flask but better than Erlenmeyer flask which have the sharp and vulnerable corners.The short neck is with a standard taper joint,which can attach the lab glassware with standard tape joint.

WIDELY USED-----A flat bottom flask is used in chemistry laboratory for experiments involving collecting and measuring liquids, mixing solvent In a distillation apparatus,the flat bottom flasks can attach to a distillation adapter,liebig or allhnn condenser,take off adapter as a distillation or receiving flask.In a soxhlet extraction, a flat bottom attaches the soxhlet extractor used as boiling and receiving flask.

DIMENSIONS-----This flat bottom flask has a capacity of 500mL,the short neck is with a 24/40 standard taper female joint, which is interchangeable ,can be attached to any jointed glassware with a 24/40 male joint.

DESIGN----This three neck distilling flask designed with a round bottom and angled necks which allows to attach three lab glassware components for distillation apparatus( simple distillation,steam distillation,fractional distillation,azeotropic distillation).Round bottom design having spherical bottoms are more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface.and allows more uniform heating or boiling of a liquid.

WIDELY USED ---Round-bottom flasks are often used to contain chemical reactions for reflux set-ups and laboratory-scale synthesis.It also can be used as a distilling flasks and receiving flasks for the distillate. For example, in a Grignard Reaction,a 3 neck flask will be used a distillation flask under a heating mantle, the center neck attaches a PTFE adapter for a magnetic stir shaft, the left angled neck attaches a pressure equalizing.The wrong neck attaches a liebig or west condenser.

DIMENSIONS-----This durable round bottom flasks with 3 necks, one center and two angled,with 24/40 standard taper joints on the necks accommodating lab apparatus for multi purpose. It features heavy wall spherical body and 1000mL capacity.Comparing to the single neck or twin neck flask,the 3 neck flasks have one more jointed neck for extra function,when it is not needed,the extra necks can be stopped by penny head glass stoppers.

DESIGN----The flat bottom flask is likely the round bottom flask but with a flat bottom allowing it standing up flat surface as the flask can sit upright on its own,rather than in a flask clamp or cork stand,ideal for using as a receiving flask.When under heating,it is not durable as round bottom flask but better than Erlenmeyer flask which have the sharp and vulnerable corners.The short neck is with a standard taper joint,which can attach the lab glassware with standard tape joint.

WIDELY USED-----A flat bottom flask is used in chemistry laboratory for experiments involving collecting and measuring liquids, mixing solvent In a apparatus,the flat bottom flasks can attach to a adapter,liebig or allhnn condenser,take off adapter as a or receiving flask.In a soxhlet extraction, a flat bottom attaches the soxhlet extractor used as boiling and receiving flask.

DIMENSIONS-----This flat bottom flask has a capacity of 2000mL,the short neck is with a 24/40 standard taper female joint, which is interchangeable ,can be attached to any jointed glassware with a 24/40 male joint.

DESIGN----This is a boiling flask designed with flat bottom,with 2 neck featured by two standard taper 24/40 outer joints.It is likely the 2 neck round bottom flask but with a flat bottom allowing it standing up flat surface as the flask can sit upright on its own,rather than in a flask clamp or cork stand,ideal for using as a receiving flask..The short neck is with two standard taper joint,which can attach the lab glassware with standard tape joints.

USE-----A flat bottom flask is used in chemistry laboratory for experiments involving collecting and measuring liquids, mixing solvent In a distillation apparatus,the flat bottom flasks can attach to a distillation adapter,liebig or allhnn condenser,take off adapter as a distillation or receiving flask. With two necks,it allows attaching one more glassware parts in the reaction or distillation,for example,it is ideal to fit a magnetic stirrer shaft for Stirring solvent.

DIMENSIONS-----This flat bottom flask has a capacity of 500mL,the short neck is with two 24/40 standard taper outer joints, which is interchangeable ,can be attached to any jointed glassware with a 24/40 male joint.

DESIGN-----Recovery flask,also named evaporation flask,designed with sloping side wall which are balanced to run-out during rotation,with round bottom fitting standard heating mantles,featuring a single neck with standard taper ground glass joint designed for easy recovery of reaction products using a spatula.

MULTIPURPOSE------The recovery flask can be used for heating, evaporation, and solvent storage or transfer.In a rotary evaporators,it is used as a evaporation flask,it is also can be used in apparatus as a receiving flask, and other experiment for storage or transfer.

DIMENSIONS-----This pear-shaped recovery flask is with 24/40 standard top joint ,capacity of 500mL.

DESIGN---A pear-shaped flask is designed round at top but pointy at the bottom so a pipette can all the liquid,and allow recover much more material than in a round bottom flask.With a standard taper joint at top for easy assembly with other lab glass apparatus with standard taper joints.It is usually with small size for small-scale s.

WHERE IS IT USED?----- Pear-shaped flasks can be used for both synthesis and evaporation,it is used for evaporating solutions to dryness post synthesis using a rotary evaporator.It can be used as both reaction flask and evaporation flask in organic chemistry.An example:it is used as a flask in the small scale short path apparatus attaching a short path head.

DIMENSIONS-----The pear-shaped flask is with 24/40 joint,capacity of 50mL.

DESIGN---A pear-shaped flask is designed round at top but pointy at the bottom so a pipette can all the liquid,and allow recover much more material than in a round bottom flask.With a standard taper joint at top for easy assembly with other lab glass apparatus with standard taper joints.It is usually with small size for small-scale s.

WHERE IS IT USED?----- Pear-shaped flasks can be used for both synthesis and evaporation,it is used for evaporating solutions to dryness post synthesis using a rotary evaporator.It can be used as both reaction flask and evaporation flask in organic chemistry.An example:it is used as a flask in the small scale short path apparatus attaching a short path head.

DIMENSIONS-----The pear-shaped flask is with 24/40 joint,capacity of 200mL.

DESIGN---A pear-shaped flask is designed round at top but pointy at the bottom so a pipette can all the liquid,and allow recover much more material than in a round bottom flask.With a standard taper joint at top for easy assembly with other lab glass apparatus with standard taper joints.It is usually with small size for small-scale s.

WHERE IS IT USED?----- Pear-shaped flasks can be used for both synthesis and evaporation,it is used for evaporating solutions to dryness post synthesis using a rotary evaporator.It can be used as both reaction flask and evaporation flask in organic chemistry.An example:it is used as a flask in the small scale short path apparatus attaching a short path head.

DIMENSIONS-----The pear-shaped flask is with 14/20 joint,capacity of 200mL.

STANDARD SIZE--- This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 500mL.

HEAT-resistance DESIGN ---With spherical bottoms,this RBF is more resistance to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. Laboy glass flasks are heavy wall designed,made by hand-blowing to ensure uniform wall thickness, made of high-quality borosilicate glass and annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling.

WIDELY USED----The round bottom flask is widely used in organic chemistry,in a or vacuum apparatus ,it’s used a a flask and receiving flask with a glass condenser and some adapters like the 14 way adapter,take-off adapter;In a reflux process,it’s used as a reaction flask with a reflux condenser.It is also used as a flask in rotary evaporators.