Specifications

Std Joint Flat-Bottom Flask · Specifications

The following are general specifications. For custom sizes or special joint sizes, please contact our sales team.

Joint Size	Capacity (ml)	OD (mm) approx.	Height (mm) approx.	Material
Please contact us to confirm the available specifications.

* Dimensions are approximate.
* Custom joint sizes and bulk procurement solutions available.

Joint Size	Capacity (ml)
Please contact us to confirm the available specifications.

Joint Size	Capacity (ml)	Variant
Please contact us to confirm the available specifications.

Product Description

The standard joint flat-bottom flask is a classic reaction vessel widely used in chemical synthesis, distillation, and storage. The flat bottom design allows direct placement on benchtops without additional stands, enhancing convenience and stability. The standard 1:10 taper ground glass joint enables leak-free connections with all matching standard joint accessories. The flat bottom also provides excellent stability for magnetic stirring, ensuring smooth stir bar operation during heated reactions.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant, low expansion, thermal shock 280°C
Flat-Bottom Design: Direct benchtop placement, no stand required
Standard Joint: 1:10 taper, precision ground for reliable sealing
Multiple Sizes: Available in 14#, 19#, 24#, 29# joint sizes
High Transparency: Easy observation of reactions
Chemical Resistant: Suitable for most organic solvents
Magnetic Stirring Compatible: Flat bottom ensures smooth stir bar operation

Quality Assurance

Every flask undergoes strict dimensional inspection, joint taper testing, and thermal resistance testing to ensure compliance with applicable standards.

Note: Ensure joints are clean and dry before use to prevent sticking. Use heating mantles or water baths for uniform heating. The flat bottom allows direct placement on benchtops for storage.

Applications

Typical Applications

Organic Synthesis

Atmospheric distillation, reflux, heating reactions

Magnetic Stirring

Flat bottom ideal for magnetic stirrers

Sample Storage

Standard joint sealed storage

Pharmaceutical R&D

Intermediate synthesis, process development

Education

University organic chemistry lab teaching

Analytical Chemistry

Sample preparation, concentration

Compatible Equipment

Heating mantles, water baths, magnetic stirrers

Standard joint condensers, distillation heads, fractionating heads

Thermometer adapters, addition funnels

Tip: The flat-bottom flask is especially suitable for magnetic stirring heating experiments. The flat bottom ensures smooth stir bar operation. Use accessories of the same joint size for optimal sealing.

Operation & Maintenance

User Guide

Preparation

Inspect flask for cracks, chips, or scratched joints
Clean joint surfaces with a soft cloth or cotton swab
Apply a small amount of vacuum grease if joints are too tight (avoid sample contamination)

Heating

Use heating mantles or water baths for uniform heating
Fill no more than 2/3 capacity to prevent boiling over
Always heat gradually, avoid sudden temperature changes
Select appropriate stir bar size for magnetic stirring

Assembly & Disassembly

Insert with gentle twisting motion, do not force
Remove by gently twisting, avoid pulling straight out
For stuck joints, try heating the outer wall with a hairdryer

Cleaning & Maintenance

Clean immediately after use to prevent residue buildup
Wash joints with soft brush and detergent, avoid hard objects
Air dry after washing, store with soft paper between joints

Care & Notes

Show care & notes

Safety Tips

Flat-bottom flasks should not be heated directly over an open flame
Watch temperature gradients during heating
Ensure joints are well sealed for vacuum applications
Always work in a fume hood when handling hazardous chemicals

Do not

Do not use cracked or chipped flasks for heating experiments

Std Joint Flat-Bottom Flask

Specifications