Specifications

Stirrer Adapter · Specifications

Standard sizes are listed below. All products comply with GB/T, ASTM, and ISO standard taper systems. Full range 10/19 ~ 60/45 available. Custom materials and sealing configurations are available.

Request custom specs

1. Glass Stirrer Adapter (Standard Joint)

GB/T	ASTM	ISO	Fits Rod O.D. (mm)	Seal Type	Material
Please contact us to confirm the available specifications.

2. PTFE Stirrer Adapter

GB/T	ASTM	ISO	Fits Rod O.D. (mm)	Seal Type	Material
Please contact us to confirm the available specifications.

3. Mercury Seal Stirrer Adapter

GB/T	ASTM	ISO	Seal Type	Application	Material
Please contact us to confirm the available specifications.

* Joint numbers (14#, 19#) indicate the largest diameter (mm) of the taper. All are 1:10 taper.
* GB/ASTM/ISO designations are different standard identifiers — physical dimensions are identical and fully interchangeable.
* Full range 10/19 ~ 60/45 available upon request.
* Standard O-ring material is rubber; Viton® upgrade available for enhanced chemical resistance.
* PTFE types require no grease.
* Mercury seal liquid media: mercury, glycerol, or water — choose based on vacuum requirements.
* Contact our sales team for MOQ and lead time on custom orders.

✦ Customization Services — We offer custom joint sizes, materials, sealing types, and rod diameter compatibility. Share your specific requirements and our technical team will provide a tailored solution.

Product Description

The stirrer adapter is a critical interface component for connecting mechanical stirrers to reaction vessels in standard taper glassware systems. The lower end features a precision-ground standard taper joint for secure connection to three-neck and four-neck flasks. The hollow interior accommodates stirring rods (glass or PTFE), while the upper sealing mechanism (O-ring or PTFE seal) maintains system integrity during rotation, preventing air ingress or gas leakage.

Although the stirrer adapter resembles a thermometer adapter in appearance, they serve different functions: the thermometer adapter holds a stationary thermometer (static seal), while the stirrer adapter allows a rotating stirring rod to pass through while maintaining a seal (dynamic seal). This requires sufficient internal clearance for rod rotation and durable, reliable sealing components.

Key Features

Borosilicate Glass 3.3 / PTFE: Glass type meets ISO 3585, thermal shock 280°C; PTFE type resists all chemical solvents
Multi‑Standard Compliance: Precision‑ground 1:10 taper meets GB/T, ASTM E, and ISO 3585 standard taper specifications
Dynamic Sealing: O-ring or PTFE seal maintains integrity during rotation
Versatile Rod Compatibility: Fits 6-8mm glass or PTFE stirring rods
PTFE Construction: Full PTFE version resists strong acids/bases, no lubrication needed
Mercury Seal Option: Liquid seal (mercury, glycerol, or water) for high-vacuum stirring

Quality Assurance

Each stirrer adapter is inspected for taper accuracy, dynamic seal integrity, and surface finish to ensure reliable performance during stirring operations. Custom bulk orders are welcome.

Tip: The stirrer adapter differs from the thermometer adapter in function. Confirm that your stirring rod O.D. (6-8mm) matches the adapter. Replace O-rings promptly if worn. PTFE types require no grease.

Applications

Typical Uses

Mechanical Stirring

Connect mechanical stirrers to three-neck and four-neck flasks for uniform mixing

Atmospheric Synthesis

Bearing interface for stirring shafts in atmospheric reactions

Inert Atmosphere Reactions

Maintain system seal during stirring to prevent air ingress

High-Vacuum Reactions

Mercury seal adapters enable stirring under high vacuum

Aggressive Systems

PTFE adapters for strong acid/base reactions

Compatible Equipment

Standard joint three-neck and four-neck flasks

Mechanical and electric stirrers

Glass and PTFE stirring rods

Reactors, Schlenk tubes

Tip: The stirrer adapter differs from the thermometer adapter in function. Confirm that your stirring rod O.D. (6-8mm) matches the adapter. Replace O-rings promptly if worn.

Operation & Maintenance

User Guide

Before Use

Inspect for cracks, chips, or scratches on any joint
Check that the O-ring or PTFE seal is intact and not deformed
Confirm stirring rod O.D. is 6-8mm
Clean all joint surfaces with a soft cloth to remove particulates

Stirring Rod Installation

Insert the stirring rod through the seal and adapter into the flask
Adjust to the desired depth
Tighten the cap to create a dynamic seal around the rod
Do not over-tighten — the rod should rotate freely
Manually rotate the rod before starting the stirrer to confirm smooth operation

Connection

Align the lower joint with the receiving apparatus and gently twist to seat
Use a clamp on the adapter body for support
For vacuum applications, ensure all joints are well-seated

Cleaning & Storage

Clean immediately after use to prevent residue buildup
Use soft brushes and appropriate detergents for the inner tube and joint
Replace seals if worn
PTFE types can be cleaned with standard solvents
Air dry and store with protective paper between ground joints
Protect joints from impacts

Stirrer Adapter · Selection Guide

Four key dimensions determine the right stirrer adapter for your system: material type, joint size, rod diameter, and sealing requirement.

1. By Material Type

Material Type	Features	Typical Use
Please contact us to confirm the available specifications.

2. By Joint Size

Scale	GB/T	Typical Volume	Matching Apparatus
Please contact us to confirm the available specifications.

3. Quick Selection Checklist

Follow this decision flow to quickly identify the right configuration:

① Media type? Standard organics → Glass | Acids/bases → PTFE
② Vacuum requirement? Standard seal → O-ring type | High vacuum → Mercury seal
③ Scale? Micro → 14# | Standard → 19#/24# | Large → 29#+
④ Rod diameter? Standard 6~8mm stirring rods

✦ Need help selecting? Contact our technical support team with your stirring rod specifications and experimental requirements — we'll recommend the optimal configuration.

Care & Notes

Show care & notes

Safety Precautions

If abnormal noise or vibration occurs during stirring, stop immediately
Wear protective gloves and safety goggles

Do not

Never use cracked or damaged adapters under vacuum
Avoid excessive force when installing stirring rods
For mercury seal types, handle mercury with care to avoid spills