Specifications

Reducing Adapter · Specifications

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

1. Common Size Combinations

Socket Size	Cone Size	Direction	Standard
Please contact us to confirm the available specifications.

* Both DIN (EU) and ASTM standards use 1:10 taper and are mutually compatible.
* Some sizes may be non-DIN; custom options available.
* Direction depends on the specific connection requirement.

2. Joint Dimensions Guide

Size Designation	Wide End Diameter (mm)	Narrow End Diameter (mm)	Joint Length (mm)
Please contact us to confirm the available specifications.

* Dimensions are approximate.
* First number in joint designation is wide end diameter; second is joint length.
* Custom size combinations available upon request.

3. Joint Types

Joint Type	Configuration	Description
Please contact us to confirm the available specifications.

* Same size combination can be ordered with different joint types.
* Inner-Outer and Outer-Inner are the most commonly used types.

Product Description

The reducing adapter is a transition component in standard joint glassware for connecting components with different joint sizes. When two glass apparatus have mismatched joint sizes and cannot be connected directly, the reducing adapter serves as a bridge. Manufactured from borosilicate glass 3.3, it complies with ISO 3585 and DIN 12257 standards.

Product Types

Reduction: Large joint (socket) → Small joint (cone) — converts large to small
Expansion: Small joint (socket) → Large joint (cone) — converts small to large

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
Two Types: Reduction (large→small) and Expansion (small→large)
Multiple Sizes: Covering 14/23→19/26 to 24/29→45/40 combinations
Standards Compliant: DIN 12257 standard, European B-type length
High Transparency: Easy observation of connection status
Chemical Resistant: Suitable for various organic solvents

Quality Assurance

Every reducing 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. Insert with gentle twisting motion, do not force. Confirm joint sizes and types (inner/outer) before selecting a reducing adapter.

Applications

Typical Applications

Distillation Apparatus

Connect flasks and condensers with different joint sizes

Reflux Apparatus

Connect flasks and reflux condensers with different joint sizes

Vacuum Systems

Connect vacuum accessories with different joint sizes

Organic Synthesis

Various apparatus assembly and connections

Education

University chemistry lab teaching

Typical Apparatus Assembly

24/29 Flask (outer) → Reducing Adapter (24/29→19/26) → 19/26 Condenser (inner)

14/23 Flask (outer) → Reducing Adapter (14/23→24/29) → 24/29 Condenser (inner)

Tip: The reducing adapter is the key component for resolving joint size mismatches. Select the appropriate size combination based on your specific connection needs. Pay attention to joint types (inner/outer) at both ends.

Reducing Adapter · Selection Guide

Select the right reducing adapter based on your connection needs:

🔽 Large→Small Reduction

Large flask connecting to small condenser or accessories.

Recommended: 24/29 → 14/23 or 19/26 · Inner-Outer

🔼 Small→Large Expansion

Small flask connecting to large condenser or accessories.

Recommended: 14/23 → 24/29 · Inner-Outer

🔁 Common Conversion

Most frequently used joint size conversions.

Recommended: 14/23 → 19/26 or 14/23 → 24/29

🏗️ Large Size Conversion

Converting between large joint sizes, e.g., 24/29 to 40/38.

Recommended: 24/29 → 40/38 or 45/40

🔗 Special Joint Type Conversion

Connecting inner joint to outer joint components.

Recommended: Select Inner-Outer or Outer-Inner based on component types

Selection Tip: First identify the joint sizes (e.g., 14/23, 24/29) and joint types (inner or outer) of the components to be connected, then select the corresponding reducing adapter size and type. Contact our technical team for assistance.

Operation & Maintenance

User Guide

Preparation

Inspect adapter 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 or fit one end with gentle twisting motion
Connect the other end to the next component
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 adapter — avoid overloading
Pay extra attention to sealing when converting large to small

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
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 adapters for experiments
Align components properly during connection to avoid stress