Specifications

Vacuum Adapter · Specifications

The following are general specifications. Multiple configurations can be combined. For custom sizes or special structures, please contact our sales team.

Request custom specs

1. Body Shapes & Channel Configurations

Straight · Single

Coaxial upper and lower joints — simplest structure

Straight Single Standard

Bent 105° · Single

105° angle, convenient receiving flask placement

Bent 105° Single Most Common

Bent 135° · Single

135° angle for special apparatus layouts

Bent 135° Single

Straight · Two-Way

Two channels — switch receiving flasks without breaking vacuum

Straight Two-Way Multi-Fraction

Bent 105° · Two-Way

105° angle + two-way — convenient layout with flask switching

Bent 105° Two-Way

Straight · Three-Way

Three channels — switch between three receiving flasks without breaking vacuum

Straight Three-Way Three-Way

Bent 105° · Three-Way

105° angle + three-way — combines layout convenience with multi-flask switching

Bent 105° Three-Way Three-Way

Spherical Receiving · Three-Way

Spherical receiving end — larger surface area, compatible with ball joints

Spherical Three-Way Ball Joint

2. Joint Sizes (DIN / EU Standard)

Joint Size	Max Inner Diameter (mm)	Ground Surface Height (mm)	ASTM Equivalent
Please contact us to confirm the available specifications.

* Both DIN (EU) and ASTM standards use 1:10 taper and are mutually compatible.

3. Configuration Options

Option	Available Types	Description
Please contact us to confirm the available specifications.

* Options can be freely combined for multiple product variants.
* Custom joint sizes and special structures available upon request.

Joint 1	Joint 2
Please contact us to confirm the available specifications.

Product Description

The vacuum adapter is a key receiving component in standard joint distillation apparatus, connecting the condenser to the receiving flask while providing a vacuum connection for reduced-pressure distillation. Manufactured from borosilicate glass 3.3, it offers excellent thermal and chemical resistance for various organic solvent distillation applications.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant, low expansion, thermal shock 280°C
Multiple Body Shapes: Straight, bent 105°, bent 135° for different apparatus layouts
Multiple Channel Configurations: Single, two-way, three-way for various receiving needs
PTFE Stopcock Option: Corrosion-resistant, excellent sealing for fine flow control
Multiple Joint Types: Standard 1:10 taper joint or ball joint
Standard Joint: 1:10 taper, precision ground for reliable sealing
Multiple Sizes: DIN (EU) 14/23 ~ 60/45 and ASTM equivalents
High Transparency: Easy observation of condensate collection
Chemical Resistant: Suitable for various organic solvents

Quality Assurance

Every vacuum adapter 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. For vacuum operations, confirm all connections are well sealed. Use accessories of the same joint size for optimal sealing.

Applications

Typical Applications

Atmospheric Distillation

Solvent recovery, product purification

Vacuum Distillation

Heat-sensitive materials, high-boiling compounds

Fractionation

Multi-component mixture separation

Solvent Purification

High-purity solvent distillation

Pharmaceutical R&D

Intermediate purification, API refining

Education

University organic chemistry lab teaching

Typical Apparatus Assembly

Distillation flask → Distillation head → Condenser → Vacuum adapter → Receiving flask

Vacuum adapter (side arm) → Vacuum pump/vacuum system

Two-way/three-way configurations allow multiple receiving flasks

Tip: The vacuum adapter is the key component connecting the condenser to the receiving flask while providing vacuum connection. Use accessories of the same joint size for optimal sealing. PTFE stopcock models are recommended for fine control applications.

Vacuum Adapter · Selection Guide

Select the right vacuum adapter configuration based on your experimental needs:

📌 Standard Distillation

For routine atmospheric or vacuum distillation with single flask collection.

Recommended: Bent 105° · Single · No Stopcock

🔀 Multi-Fraction Collection

Switch receiving flasks without breaking vacuum for different temperature fractions.

Recommended: Straight/Bent 105° · Two-Way or Three-Way

🎯 Fine Flow Control

Precise control of condensate flow into receiving flasks.

Recommended: Single PTFE Stopcock or Double PTFE Stopcock

🔗 Flexible Connection Needs

Requires flexible receiving flask angles or special interface connections.

Recommended: Ball Joint + Bent Shape

💧 Anti-Walling Requirement

High-boiling or crystallizing materials — prevent condensate from adhering to walls.

Recommended: Drip Tip (with dropper) Design

🧪 Large Capacity Receiving

Needs deep reach into large receiving flasks or larger receiving surface area.

Recommended: Long Neck or Spherical Receiving End

Selection Tip: Recommendations are for common scenarios. For actual selection, consider your specific apparatus layout, number of fractions, and material properties. Contact our technical team for assistance.

Operation & Maintenance

User Guide

Preparation

Inspect adapter for cracks, chips, or scratched joints
Clean all joint surfaces with a soft cloth or cotton swab
Apply a small amount of vacuum grease if joints are too tight
PTFE stopcock models: Check O-ring integrity and smooth rotation
Ball joint models: Check O-ring condition

Installation & Connection

Connect the upper joint to the condenser, insert with gentle twisting
Connect the lower joint to the receiving flask
Connect the vacuum side arm to the vacuum system
Two-way/three-way models: Connect receiving flasks to corresponding ports
Secure components with clamps
PTFE stopcock models: Confirm stopcock is closed before applying vacuum

Distillation/Receiving Operation

Check all joints for proper sealing
Start vacuum system, confirm system integrity
Begin heating, observe condensate collection
Single models: Direct collection
Two/Three-way models: Switch channels using stopcock rotation
Maintain system vacuum when switching flasks
Collect fractions at each temperature range

Disassembly & Cleaning

Stop heating, close vacuum system, allow to return to atmospheric pressure
Gently twist to detach components (receiving flask first, then adapter)
PTFE stopcock models: Remove and clean separately
Clean immediately after use to prevent residue buildup
Wash joints with soft brush and detergent, avoid hard objects
PTFE stopcock can be cleaned with organic solvents; maintain O-ring
Air dry after washing, store with soft paper between joints

Care & Notes

Show care & notes

Safety Tips

Confirm all joints are well sealed before vacuum operation
PTFE stopcock maximum operating temperature: 280°C
Ball joint connections: Ensure O-ring is properly seated
Control temperature carefully when distilling flammable solvents
Always work in a fume hood when handling hazardous chemicals

Do not

Do not use cracked or chipped adapters for vacuum experiments
Avoid sudden pressure changes when switching flasks