Best Juanbao Pure Life in 2026

Quality material：Made of soda-lime glass, which has good resistance to solvent and high-temp，good optical clarity and chemical stability

Features:Solid round with polished smooth surface,softening point: 726C / 1340F

Function:Often used as filler to filter and clarify in the filtration operation,placed in a flask to liquid bumping during distillation.Glass balls are especially useful for model paint mixing, grinding and sanding, or use as lab boiling stones.

Capacity: 2000ml

Height: 248mm

Outside Diameter: 153mm

2000ml Flat Bottom Boiling Flask

1 Single Neck

Made of high quality glass

500ml Flat Bottom Boiling Flask

1 Single Neck

Made of high quality glass

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.

Volume: 250ml (8.5oz)

Material: Made of high quality 3.3 Borosilicate glass to prevent cracking

Appearance: Flat Bottom that can be set on a surface, short neck, without graduation

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.

Round Bottom Flask

2 Angled Neck

24/40 Center Joint in the central and side

Widely used as heating and reaction vessel in chemical experiments

Round Bottom Flask

Single Neck 24/40

Widely used as heating and reaction vessel in chemical experiments

Round Bottom Flask

Single Neck 24/40

Standard Size and Capacity: It features a 24/40 Standard Taper Outer Joint and a maximum capacity of 500ml.

Package Includes: The pack contains two 500ml Single Neck Flat bottomed flasks, perfect for storing or transporting liquids. Whether used in the lab or the home, these flasks are a great choice for any application.

Widely Used: Can be connected to a distillation, adapter for collecting and measuring liquids. Mixing solvent In a distillation apparatus,the flat bottom flasks can attach to a distillation adapter. In a soxhlet extraction, a flat bottom attaches the soxhlet extractor used as boiling and receiving flask.

Package contains: 1 Pack 500ml Single Neck Flat bottomed flask.

Standard size: With 24/40 Standard Taper Outer Joint, capacity is 500ml.

Widely used: Can be connected to a distillation adapter for collecting and measuring liquids.

SIZE - Diameter 3mm/0.12inch

PREMIUM MATERIAL - Made of high quality glass, which is durable, scratch-resistant, strain point: 440 ℃, softening point: 505 ℃

USE - These glass beads are useful as packing for distillation columns and they can also be used as boiling stones or mixing beads

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.

Size - 8mm Diameter. The package includes 200 pieces of balls

Material - Made of soda-lime glass, which has good resistance to solvent and high-temp.

Features - Solid round with polished smooth surface. The diameter tolerance is about +/-0.02mm. Softening Point: 726C / 1340F

50 ml Flat Bottom Boiling Flask

1 Single Neck Flat bottomed flask

Made of Borosilicate Glass

4pcs of 250ml (8.45oz) Boiling Flasks

Flat Bottom and short neck, without graduation

Borosilicate 3.3 glass material to prevent cracking

Round Bottom Flask, Short Neck

Made of Borosilicate glass

Single Short Neck with 24/40 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.

500 mL Round Bottom Flask

2 Angled Neck

19/22 center joint and 19/22 side 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.

Flask made of heavy duty borosilicate glass.

50ml Capacity

Long neck

Flask made of heavy duty borosilicate glass.

1000ml Capacity

Narrow neck

Premium Quality: Made of high-quality borosilicate glass, heavy glass wall, durable and reusable.

Standard Size: The round-bottom flask features the 24/40 standard taper outer joint, interchangeable and leak-free. The capacity of 1000ml.

Heat-Resistant: With the round bottom, the boiling flask is more resistant to breaking under vacuum, as a sphere can evenly distribute stress across its surface. Heavy glass wall, made by hand-blowing to ensure even wall thickness, made of high-quality borosilicate glass and annealed at 800 degrees Celsius, can be heated directly in an open flame and can withstand typical laboratory thermal variations in chemistry processes like heating and cooling.

LABORATORY FLASK: Corning provides a number of PYREX brand flasks for special purpose applications

SAFE & DURABLE: Offering superior heat, chemical and thermal shock resistance

PERMANENT MARKINGS: Permanent white enamel to resist chemical attack during lab usage

50mL round bottom, wide neck boiling flask made of lab-grade borosilicate 3.3 glass

Inside diameter of mouth is 1-1/8"

Diameter of flask bulb is 2"

LABORATORY FLASK: Corning provides a number of PYREX brand flasks for special purpose applications

SAFE & DURABLE: Offering superior heat, chemical and thermal shock resistance

PERMANENT MARKINGS: Permanent white enamel to resist chemical attack during lab usage