Specifications

75° Elbow · Specifications

The following are common specifications. Both ends are the same joint size. For custom sizes or special structures, please contact our sales team.

Request custom specs

1. Joint Sizes (Same Size Both Ends)

Joint Size	Max Inner Diameter (mm)	Joint Length (mm)	Joint Type	Angle	Material
Please contact us to confirm the available specifications.

* Both DIN (EU) and ASTM standards use 1:10 taper and are mutually compatible.
* Both ends are the same joint size to ensure matching connections.
* Supports full range from 10/19 to 60/45.
* Custom joint sizes and tube lengths (200mm, 300mm, etc.) available upon request.

2. Comparison with 105° Elbow

Feature	75° Elbow	105° Elbow
Please contact us to confirm the available specifications.

* 105° elbow provides a larger angle change for special apparatus layouts.
* Some manufacturers offer adjustable 75°-105° elbows.
* Tiandi Labware offers 200mm and 300mm tube lengths.

Product Description

The 75° elbow is a connecting adapter in standard joint glassware for changing the direction of tubing in distillation and fractionation apparatus. It is commonly used to connect distillation flasks and condensers, allowing vapor to pass smoothly while changing flow direction. The main body is a 75° bent tube with standard outer taper joints (cones) at both ends for connection to inner joint (socket) components. Both ends are the same joint size, with support for any standard joint size from 10/19 to 60/45. Manufactured from borosilicate glass 3.3, it offers excellent thermal and chemical resistance.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant, low expansion, thermal shock 280°C, high transparency
Standard Joint: 1:10 taper, precision ground for reliable sealing
Double Male Design: Both ends are outer joints (cones) for connecting inner joints (sockets)
Same Size Both Ends: Ensures matching connections
Full Range Sizes: Supports any standard joint size from 10/19 to 60/45
75° Bend Angle: Allows flexible apparatus setup and vapor direction change
High Transparency: Easy observation of vapor flow
Chemical Resistant: Suitable for various organic solvents

Quality Assurance

Every 75° elbow 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. Insert with gentle twisting motion, do not force. Use accessories of the same joint size for optimal sealing. For a larger angle change, consider the 105° elbow.

Applications

Typical Applications

Distillation Apparatus

Connect distillation flask and condenser, change vapor flow direction

Fractionation Apparatus

Connect fractionating column and condenser, guide distillate flow

Vacuum Distillation

Guide vapor flow under reduced pressure, prevent bumping

Organic Synthesis

Various apparatus assembly and connections

Education

University chemistry lab teaching

Typical Apparatus Assembly

Distillation flask (inner) → 75° Elbow (outer) → Condenser (inner)

Fractionating column (inner) → 75° Elbow (outer) → Condenser (inner)

Tip: The 75° elbow is a key component for changing vapor direction in distillation and fractionation apparatus. Use accessories of the same joint size for optimal sealing.

75° Elbow · Selection Guide

Select the right 75° elbow based on your connection needs:

🔗 Distillation Apparatus

Connect distillation flask and condenser, change vapor flow direction.

Recommended: 75° Elbow · 24/40 · Double Male

🔗 Fractionation Apparatus

Connect fractionating column and condenser, guide distillate flow.

Recommended: 75° Elbow · Match component joint size

🔗 Vacuum Distillation

Connect components in vacuum distillation, prevent bumping.

Recommended: 75° Elbow · 24/40 · Double Male

📏 Micro/Small Scale

For small-scale reactions requiring direction change.

Recommended: 75° Elbow · 14/20 · Double Male

Selection Tip: For standard distillation and fractionation, the 75° elbow is recommended. Select size based on scale: 14/20 for micro, 19/22 or 24/40 for standard, 29/42+ for pilot scale. For larger angle changes, consider the 105° elbow. Contact our technical team for assistance.

Operation & Maintenance

User Guide

Preparation

Inspect elbow 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

Installation & Connection

Confirm joint sizes match the components to be connected
Insert both ends into the inner joint components with gentle twisting motion
Insert with gentle twisting motion, do not force
Secure components with clamps for stability

Operation Notes

Check all joints for proper sealing after connection
Consider weight load on the elbow — avoid overloading
In vacuum distillation, ensure proper angle to prevent bumping

Disassembly & Cleaning

Gently twist to detach components
Clean immediately after use to prevent residue buildup
Wash joints with soft brush and detergent, avoid hard objects
Clean the interior with ethanol or acetone if needed
Air dry after washing, store with soft paper between joints

Care & Notes

Show care & notes

Safety Tips

Watch temperature gradients during heating
Always work in a fume hood when handling hazardous chemicals

Do not

Do not use cracked or chipped elbows for experiments
Align components properly during connection to avoid stress