Specifications

Std Joint Round-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 round-bottom flask is a versatile reaction vessel widely used in organic synthesis, distillation, reflux, and extraction. The round-bottom design ensures uniform heating and compatibility with heating mantles, oil baths, and water baths. The standard 1:10 taper ground glass joint enables leak-free connections with all matching standard joint accessories.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant, low expansion, thermal shock 280°C
Standard Joint: 1:10 taper, precision ground for reliable sealing
Short Neck Design: Minimizes dead volume, easy connection
Multiple Sizes: Available in 14#, 19#, 24#, 29# joint sizes
High Transparency: Easy observation of reactions
Chemical Resistant: Suitable for most organic solvents

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 a heating mantle or wire gauze for uniform heating.

Applications

Typical Applications

Organic Synthesis

Reflux, atmospheric distillation, vacuum distillation

Extraction & Purification

Soxhlet extraction, liquid-liquid extraction

Pharmaceutical R&D

Intermediate synthesis, API purification

Education

University organic chemistry lab teaching

Analytical Chemistry

Sample preparation, concentration

Compatible Equipment

Heating mantles, oil baths, water baths

Standard joint condensers, distillation heads, fractionating heads

Rotary evaporators (pear/eggplant flasks recommended)

Magnetic stirrers, mechanical stirrers

Tip: Standard joint apparatus can be freely combined. Use accessories of the same joint size for optimal sealing and interchangeability.

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 oil baths for uniform heating
Fill no more than 2/3 capacity to prevent boiling over
Always heat gradually, avoid sudden temperature changes

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

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 or vacuum work

Std Joint Round-Bottom Flask

Specifications