Specifications

Cold Finger Condenser · Specifications

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

Joint Size	Condenser OD (mm)	Effective Length (mm)	Drip Tip Type	Material
Please contact us to confirm the available specifications.

* Dimensions are approximate.
* Effective length is the immersion length of the cold finger.
* Custom joint sizes and lengths available upon request.

Product Description

The cold finger condenser (also known as cold trap condenser) is a specialized condensation device in standard joint glassware. Its unique cold finger design allows filling with cooling media such as ice water, dry ice-acetone, or liquid nitrogen for maximum condensation efficiency. Unlike traditional water-jacketed condensers, the cold finger condenser relies on internal cooling media to directly absorb heat, making it ideal for high-vacuum systems, sublimation purification, freeze-drying, and low-boiling solvent recovery. Equipped with a drip tip for convenient condensate collection.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant, low expansion, thermal shock 280°C
Cold Finger Design: Hollow interior for cooling media (ice water, dry ice-acetone, liquid nitrogen)
Drip Tip: Enables convenient condensate collection
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 condensation/sublimation
Chemical Resistant: Suitable for various organic solvents
Vacuum Compatible: Suitable for high-vacuum systems

Quality Assurance

Every condenser 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. Different cooling media can be used based on experimental requirements. When using dry ice-acetone or liquid nitrogen, take proper safety precautions.

Applications

Typical Applications

Sublimation Purification

Solid sample purification (e.g., caffeine, camphor)

Freeze-Drying

Vacuum freeze-drying of biological samples

Low-Boiling Solvent Condensation

Ether, dichloromethane recovery

High-Vacuum Distillation

Vacuum system integration

Volatile Sample Collection

Volatile organic compound collection

Education

University organic and physical chemistry teaching

Compatible Equipment

Standard joint round-bottom flasks, three-neck flasks

Vacuum systems (vacuum pumps, vacuum lines)

Sublimation apparatus, freeze dryers

Tip: The cold finger condenser is the preferred condensation device for sublimation and freeze-drying. Condensation temperature can be adjusted by selecting appropriate cooling media (ice water, dry ice-acetone, liquid nitrogen). Use accessories of the same joint size for optimal sealing.

Operation & Maintenance

User Guide

Preparation

Inspect condenser 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
Prepare appropriate cooling media based on experimental requirements

Cooling Media Selection

Ice Water (0°C): Standard condensation, low-boiling solvent recovery
Ice-Salt Bath (-5°C ~ -20°C): Moderate temperature condensation
Dry Ice-Acetone (-78°C): Sublimation purification, high-vacuum condensation
Liquid Nitrogen (-196°C): Ultra-low temperature condensation, volatile sample collection

Installation & Connection

Connect the cold finger vertically to the flask or reactor via the joint
Insert with gentle twisting motion, do not force
Secure the condenser with a clamp for vertical stability
For vacuum operations, ensure all joints are well sealed

Condensation/Sublimation Operation

Fill the cold finger with cooling media (about 2/3 capacity)
Begin heating or vacuum, observe condensation/sublimation progress
Collect condensate through the drip tip promptly
Replenish or replace cooling media as needed

Disassembly & Cleaning

Stop heating or turn off vacuum system first
Allow cold finger to return to room temperature, then discard residual coolant
Gently twist to detach the condenser
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

When using dry ice-acetone or liquid nitrogen, wear cryogenic gloves and safety goggles
Ensure proper ventilation when using liquid nitrogen to prevent oxygen deficiency
Ensure all joints are well sealed for high-vacuum operations
Always work in a fume hood when handling hazardous chemicals

Do not

Do not use cracked or chipped condensers for experiments
Do not fill cooling media beyond 2/3 capacity to prevent expansion overflow

Cold Finger Condenser

Specifications