Round Bottom Flask

Glass Round Bottom Flask

Guide Medlab round bottom flasks are robust lab reaction vessels manufactured from premium 3.3 borosilicate glass. With a spherical‑bottom structure for uniform heat distribution, they are well suited for oil‑bath heating, reflux and distillation operations. Fitted with standard ground‑glass joints for secure connection with other laboratory glass accessories, the flasks offer excellent thermal‑shock performance and chemical corrosion resistance. They are widely used for organic synthesis, pharmaceutical R&D, environmental testing and university chemistry teaching.

Product Specification

Product Name	Round Bottom Boiling Flask
Material	Borosilicate 3.3 Glass
Available Capacity	25ml,50ml,100ml,250ml,500ml,1000ml,2000ml,3000ml,5000ml
Feature	Wide neck, uniform wall thickness, flat/round bottom optional, smooth rim
Neck Type	Plain non‑ground neck, fire‑polished edge
Neck Option	Ground joint optional: standard joint 24/29, 29/32 and non‑standard joints available
Glass Property	High thermal shock resistance, good chemical inertness
Marking	Without graduation marking
OEM	Available

●Advantage

Constructed from 3.3 borosilicate glass, featuring outstanding thermal‑shock performance and crack‑resistant property. Uniform wall thickness guarantees even heat distribution during boiling and distillation tests. Wide‑neck structure simplifies filling, liquid transfer and sample feeding. The round‑bottom design is well‑suited for long‑duration liquid heating, widely applied in chemistry teaching as well as routine lab distillation and reflux reactions.

Application

Guide Medlab glass round bottom flasks are high-strength reaction vessels made of 3.3 borosilicate glass, designed for uniform heating, reflux and distillation operations. They are widely applied in organic chemistry laboratories, pharmaceutical research, environmental analysis and university chemical teaching.

• Continuous heating, boiling and constant-temperature reactions for organic synthesis experiments

• Laboratory distillation, reflux condensation and solvent purification procedures

• Long-term thermal reactions that require stable and uniform heat distribution

• Sample pretreatment and conventional chemical testing in scientific research and industrial laboratories

Usage Method

1. Thoroughly clean the round bottom flask before use to remove dust and residual contaminants.
2. Add reactants and solvents through the flask neck; avoid overfilling to prevent liquid overflow during heating.
3. Secure the flask firmly with lab stand and clamp prior to heating.
4. Only use water‑bath or oil‑bath heating. Direct open‑flame heating is prohibited. Avoid sharp drastic temperature changes to prevent glass cracking.
5. Connect with compatible lab glass accessories to build reflux or distillation setups.
6. Fully clean and dry the flask after experiments for repeated use.

Quality Control

Packing, Storage and Transportation

●Packing

Glass round bottom flasks are packed in corrugated cartons complying with GB/T 6543. Outer cartons are marked with product name, specification, quantity, net weight, gross weight and volume. Custom OEM‑packing solutions are available upon request.

●Storage

Store packaged goods indoors under dry conditions. Do not over‑stack. Keep away from corrosive chemical substances.

●Transportation

Multiple transport modes are supported. Avoid heavy impact, dropping, compression and moisture during loading, unloading and transit.

Capacity	25ml	50ml	100ml	250ml	500ml
Packing Qty	400pcs/carton	192pcs/carton	192pcs/carton	72pcs/carton	48pcs/carton
Capacity	1000ml	2000ml	3000ml	5000ml
Packing Qty	24pcs/carton	12pcs/carton	8pcs/carton	4pcs/carton

FAQ

Q1: Do you offer free samples?
Yes, we provide free samples (usually 5‑10pcs) for your evaluation. Shipping cost is covered by the customer or negotiated separately.
Q2: What is minimum order quantity (MOQ)?
MOQ varies by products, usually for flasks, MOQ is 5 cartons; for plasticwares, MOQ would be 1 carton; for other disposable glasswares, MOQ is also 5 cartons, we suggest adding pallet to protect glass goods.
Q3: What payment methods do you accept?
We accept T/T (bank transfer) or pay through Alibaba.
Q4: Can I add my own design or logo to the product?
Yes, we provide OEM/ODM service.
Q5: Can you provide CE and ISO for your products?
Yes, all products include complete technical documentations including CE, ISO and COA. For some products, we offer FDA.
Q6: Do you support shipping insurance and freight options?
Yes, we offer sea, air and courier shipping with optional full insurance coverage.
Q7: How do you prevent scratches & deformation during shipping?
We pack them in thick 5‑layer corrugated cartons. The damage rate is controlled below 1%.
Q8: What is your policy for damaged goods?
If scratched, deformed or missing items are found upon receipt, please send photos/videos within 48 hours. We will arrange free replacements or corresponding refunds.
Q9: What is your typical lead time?
For custom engraved or bulk orders, it usually takes 15–25 days.
Q10: Do you have a price list for bulk purchases?
Yes, we offer tiered pricing based on order volume. Please contact our sales team for a formal quote.
Q11: Do you participate in international labware exhibitions?
Yes, we regularly attend exhibitions like ARABLAB, ACHEMA, and Analytica.
Q12: Does this round bottom flask have volume graduation marks?
No, this round bottom flask comes without graduation markings. It is designed for reaction, distillation and reflux experiments instead of volumetric measurement.
Q13: What heating ways are suitable for this glass round bottom flask?
Water bath or oil‑bath heating is recommended. Direct open‑flame heating is prohibited. Avoid sudden extreme temperature changes to prevent glass cracking.

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