Best Stonylab Lab Boiling Flasks in 2026

Capacity: 2000ml

Height: 248mm

Outside Diameter: 153mm

2000ml 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.

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.

PURE SOLUTIONS: The filtering lab flask can be used to separate components or impurities in your mixtures or solutions. The filtration apparatus is built to last with tough, heat resistant borosilicate glass designed to handle boiling liquids and strong vacuums.

FAST FILTERING ACTION: The filtering and distillation kit can be used with or without a vacuum. For faster, higher volume jobs, just hook up a vacuum hose to the filtering flask and quickly pull your solution through the funnel. A lab vacuum filtration apparatus allows you to filter oil and water soluble solutions without damaging or losing heat-sensitive compounds in a distillation. This filtering flask comes with a high quality rubber stopper and aluminum clamp that allow for strong vacuums.

FAST FILTERING ACTION: The filtering and distillation kit can be used with or without a vacuum. For faster, higher volume jobs, just hook up a vacuum hose to the filtering flask and quickly pull your solution through the funnel. A lab vacuum filtration apparatus allows you to filter oil and water soluble solutions without damaging or losing heat-sensitive compounds in a distillation. This filtering flask comes with a high quality rubber stopper and aluminum clamp that allow for strong vacuums.

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

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

Round Bottom Flask with 2 Angled Neck

24/40 Center Joint in the central and side

Made of durable Borosilicate Glass; perfect handcraft; easy to clean

Capacity: 100ml

24/40 joint

Recovery flask

Designed for nitrogen determination as per Kjeldahl method

Made of high quality Borosilicate glass

800mL capacity

Capacity: 5L / Liters

Connection Size: #60 Seal Size

OD 3-1/8 " ID 2-3/8"

Capacity: 500ml

Long neck round bottom Kjeldahl flask

O.D.of bulb: 100mm; O.D.of neck: 30/35mm; Height: 300mm

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.

Made From Borosilicate Glass 3.3

Annealing Point ------560℃

Linear Coefficient of Expansion------ 32×10-7/℃

Be Made From G3.3 Borosilicate Glass

Annealing Point ------560℃

Linear Coefficient of Expansion------ 32×10-7/℃

APPLICATION-The liquid nitrogen dewar can store semen/embryos/cells/dry ice and etc. For liquid nitrogen, we have tested 3L, 6L, 10L tank under 17 Celsius and their storage time is 35 days, 65 days and 105 days. For dry ice storage, 10L dewar is recommended and it can be stored for about 10 days.

CANISTERS-Each liquid nitrogen container comes with 6 stainless steel canisters, of which 1 without holes for retrieving small amount of N2, 5 with holes for holding samples.

MATERIAL-Made of aeronautical aluminums, the cryogenic container is of high strength and can protect liquid nitrogen and samples.

Capacity: 50ml

Long neck round bottom Kjeldahl flask

Standard 24/40 ground glass joint

Reinforced bead at top

300 mL and larger sizes have tooled necks

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.

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.

GLASS PAINT MIXING BALLS-- It is made of non-alkaline soda-lime glass material, which has good stability and will not pollute the processed metal.

GLASS BOILING STONES BEAD-- - [After- sales] We are committed to bringing customers a good shopping experience, if you have any questions about the product, you can contact our customer service, we will do our best to solve the problem for you.

ANTI RIOT BOILING BEAD-- It has various properties such as high precision, heat resistance, wear resistance, pressure resistance, and stability

This excellent workmanship of our product will bring you a good using experience.

suitable for chemical plants, pharmaceutical factories, colleges and universities, and scientific research unit.

often used as filler to filter and clarify in the filtration operation.

Capacity: 20L / Liters

Connection Size: #95 Seal Size

Made of high quality, heavy duty, 3.3 borosilicate glass

500ml capacity

Stands 6" tall, and is 4" in diameter at its widest point

PURE SOLUTIONS: The filtering lab flask can be used to separate components or impurities in your mixtures or solutions. The filtration apparatus is built to last with tough, heat resistant borosilicate beaker glass designed to handle boiling liquids and strong vacuums. The glass is packaged tightly and thoroughly inspected to guarantee you receive an unblemished product.

LAB QUALITY, MANY USES: Use the 2000mL filtering flask for chemistry experiments in the lab or school; to make e-juice, distilling, concentrate and oils; to filter essential oils and plant extracts; to make soap; and more!

FAST FILTERING ACTION: The filtering and distillation kit can be used with or without a vacuum. For faster, higher volume jobs, just hook up a vacuum hose to the filtering flask and quickly pull your solution through the funnel. A lab vacuum filtration apparatus allows you to filter oil and water soluble solutions without damaging or losing heat-sensitive compounds in a distillation. This filtering flask comes with a high quality rubber stopper and aluminum clamp that allow for strong vacuums.