Specifications

Std Joint Three-Neck Flask · Specifications

The following are common specifications. Custom joint combinations available upon request.

Capacity (ml)	Center Joint	Side Joints	OD (mm) approx.	Material
Please contact us to confirm the available specifications.

* Joint combinations shown are standard configurations.
* Custom joint combinations available upon request.
* Side necks available in angled (standard) or vertical design.

Capacity (ml)	Joint 1	Joint 2	Joint 3	Variant
Please contact us to confirm the available specifications.

Product Description

The standard joint three-neck flask is one of the most versatile reaction vessels in standard joint glassware. Featuring three standard ground glass joints, it allows simultaneous connection of multiple accessories for complex experimental setups. The center neck is typically used for stirrers or condensers, while the side necks accommodate thermometers, addition funnels, or gas inlet tubes. The round-bottom design ensures uniform heating with heating mantles or oil baths.

Key Features

Three-Neck Design: One center neck + two side necks for multiple accessories
Borosilicate Glass 3.3: ISO 3585 compliant, thermal shock 280°C
Standard Joints: 1:10 taper, precision ground for reliable sealing
Multiple Combinations: Various joint size combinations available
Angled or Vertical: Side necks available in angled or straight design
High Transparency: Easy observation of reactions

Quality Assurance

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

Note: Ensure all joints are clean and dry before assembly. Use heating mantles for uniform heating. Check all connections for proper sealing.

Applications

Typical Applications

Organic Synthesis

Multi-step reactions, reflux, inert atmosphere reactions

Distillation

Atmospheric and vacuum distillation

Pharmaceutical R&D

Intermediate synthesis, process development

Materials Science

Nanomaterial synthesis, polymer preparation

Education

University organic chemistry lab teaching

Typical Accessory Combinations

Center neck → Mechanical stirrer / Serpentine condenser

Side neck → Thermometer adapter / Constant-pressure funnel

Side neck → Gas inlet tube / Hollow stopper

Tip: Three-neck flasks offer flexible accessory combinations. Select appropriate joint sizes based on your experimental requirements.

Operation & Maintenance

User Guide

Preparation

Inspect all joints for cracks, chips, or scratches
Clean all joint surfaces, ensure no residue
Prepare accessories and verify joint size compatibility

Assembly

Install center neck accessories first (stirrer or condenser)
Install side neck accessories sequentially with gentle twisting
Check all connections for proper sealing after assembly

Heating

Use heating mantles for uniform heating
Fill no more than 2/3 capacity
Always heat gradually, avoid sudden temperature changes

Disassembly & Cleaning

Remove side neck accessories first, then center neck
Clean accessories separately to avoid cross-contamination
Air dry after washing, store with soft paper between joints

Care & Notes

Show care & notes

Safety Tips

Ensure stirrers are securely mounted to prevent wobbling
Verify all joints are well sealed for vacuum operations
Always work in a fume hood when handling hazardous chemicals

Do not

Do not use cracked or chipped flasks for experiments

Std Joint Three-Neck Flask

Specifications