Specifications

Complete specifications for PTFE retrievers. Items marked Customizable available upon request.

I. Straight Type (9mm Diameter)

Shaft Length (mm)	Head Diameter (mm)	Shaft Diameter (mm)
150	9	7
200	9	7
250	9	7
300	9	7
350	9	7
400	9	7
500	9	7

II. Ring Type (10mm Diameter · Ring Magnet Head)

Shaft Length (mm)	Shaft Diameter (mm)	Head Type
300	10	Ring magnet head
350	10	Ring magnet head
400	10	Ring magnet head
450	10	Ring magnet head
500	10	Ring magnet head
600	10	Ring magnet head

III. Soft Type (Flexible Shaft)

Shaft Length (mm)	Shaft Diameter (mm)	Feature
410	10	Flexible shaft, bendable operation

Custom lengths and head shapes available upon request.

📌 Customization Options:
• Shaft Diameter: 7mm / 9mm / 10mm / 12mm available
• Head Type: Straight magnet / Ring magnet / Custom shape
• Magnet Strength: Standard / High-strength
• Custom lengths and head shapes available upon request — consult our technical team

Product Description

I. Overview

The PTFE stirring bar retriever is a specialized laboratory tool designed for safely removing magnetic stirrers from solution containers. Featuring a stainless steel core with a strong neodymium magnet fully encapsulated in a high-purity PTFE coating — enabling convenient, contamination-free retrieval of stirrers via magnetic attraction.

The PTFE coating provides exceptional chemical resistance — inert to strong acids (including hydrofluoric acid), strong alkalis, aqua regia, and all organic solvents — allowing long-term use in corrosive environments. The stainless core delivers mechanical strength and rigidity for deep-container operations without bending.

In addition to its primary function as a retriever, the tool can also be used for manual liquid stirring. Available in Straight (9mm diameter) and Ring (10mm diameter, ring-shaped magnet head) types with lengths from 150mm to 600mm to suit all laboratory containers.

II. Core Performance Parameters

Shaft Construction: Stainless core + PTFE coating
Magnet: NdFeB, high-strength
Shaft Diameter: Straight 9mm / Ring 10mm
Operating Temperature: -196℃ ~ 260℃
Chemical Resistance: Resistant to HF, aqua regia, concentrated H₂SO₄, HNO₃, strong alkalis, organic solvents
Surface: Non-stick, easy to clean

III. Material & Workmanship

Manufactured using imported high-purity PTFE resin with precision encapsulation technology — the stainless core and magnet are fully enclosed within the PTFE layer, ensuring no metal contact with media and eliminating metal ion contamination risks. The magnet is securely integrated with the shaft, preventing separation.

The ring type retriever features a ring-shaped magnet head providing larger magnetic contact area for stable retrieval of stirrers of all sizes, particularly large stirrers.

All products are manufactured and packaged in cleanroom environments to ensure particle-free, contaminant-free surfaces.

Applications

Typical Applications

Retrieving Magnetic Stirrers

Remove stirrers from beakers, flasks, tubes, centrifuge tubes — avoiding direct pouring or manual picking

Manual Stirring

Used for manual liquid stirring when electric stirrers are unavailable

Transferring Stirrers

Move stirrers from one container to another

Cleaning Operations

Retrieve stirrers for cleaning during maintenance

Corrosive Environment Operations

Safely retrieve stirrers from strong acids, alkalis, and other corrosive media

Industries

Chemistry Labs Stirrer retrieval in synthesis reactions
Pharmaceutical Formulation and synthesis operations
Environmental Testing Water sample pretreatment
Food Industry Sample preparation and dissolution
Research Institutes General laboratory operations

Chemical	PTFE Compatibility	Recommended Temperature	Notes
Hydrofluoric Acid (HF)	✅ Fully Compatible	≤ 250℃	PTFE is the only reliable material
Aqua Regia	✅ Fully Compatible	≤ 200℃	Avoid extreme conditions
Conc. H₂SO₄ (98%)	✅ Fully Compatible	≤ 250℃	Handle with care when heating
Conc. HNO₃ (65%)	✅ Fully Compatible	≤ 250℃	Store away from light
NaOH (50%)	✅ Fully Compatible	≤ 200℃	Safe handling required for concentrated alkalis
Organic Solvents	✅ Fully Compatible	≤ Solvent BP	Ensure ventilation and fire safety

Selection Guide

I. By Container Depth

Container Depth	Recommended Length	Recommended Type
< 150mm	150mm	Straight
150mm ~ 200mm	200mm	Straight
200mm ~ 300mm	250mm ~ 300mm	Straight
300mm ~ 400mm	350mm ~ 400mm	Straight / Ring
400mm ~ 500mm	450mm ~ 500mm	Ring (high-strength)
> 500mm	500mm ~ 600mm	Ring (high-strength)

II. By Stirrer Size

Small stirrers (< 20mm): Straight type, 9mm head diameter
Medium stirrers (20-50mm): Straight type, standard
Large stirrers (> 50mm): Ring type, larger magnetic contact area

III. Straight vs Ring

Straight (Standard): Most versatile, suitable for the majority of laboratory containers
Ring (High-strength): Ring magnet head provides larger contact area — stable retrieval of all stirrer sizes, especially in deep vessels and for large stirrers
Soft (Flexible): Bendable shaft — suitable for narrow-neck vessels or operations requiring obstacle avoidance

💡 Selection Tip: Retriever length should be 50-100mm greater than the container depth to ensure the handle remains outside the vessel for comfortable operation.
For deep vessels (> 400mm), choose Ring type for more stable magnetic attachment and reduced risk of dropping stirrers during retrieval.
For narrow-neck containers, choose the Straight 9mm retriever — the thinner shaft passes through narrow openings more easily.
For corrosive media operations, always choose PTFE-coated retrievers to prevent metal contact with corrosive liquids.

Operation & Maintenance

User Guide

Standard operating guidelines for PTFE retrievers. Proper use ensures safe and efficient stirrer retrieval.

I. Pre-use Preparation

Inspect the PTFE coating for integrity — no damage or cracks
Check the magnet is secure — no looseness
Clean with ultrapure water or appropriate solvent to remove surface particles
Confirm retriever length is suitable for the container depth

II. Retrieving Operation

First, stop the magnetic stirrer — ensure the stirrer has come to a complete stop
Slowly lower the retriever head into the container, approaching the stirrer
Use magnetic attraction to pick up the stirrer — gently lift the retriever
Remove the stirrer from the container and transfer to the target location

III. Manual Stirring Operation

Immerse the retriever head in the liquid and manually agitate back and forth
The PTFE coating is non-stick — easy to clean after use
Suitable for temporary stirring of small liquid volumes

IV. Cleaning & Maintenance

Clean with ultrapure water or appropriate solvent after use — PTFE's non-stick surface makes cleaning easy
Stubborn residues may be soaked in dilute nitric acid
Air dry or wipe dry
Store in a clean, dry location — keep away from strong magnetic fields (may affect magnetism)
Periodically check magnet strength — replace if significantly weakened

V. Important Notes

Avoid impact with hard objects — may damage the PTFE coating
Avoid exceeding rated temperature during prolonged use (magnets may demagnetize at high temperatures)
Never use hard brushes or abrasives for cleaning
Store in a dry, dark place away from strong magnetic fields when not in use

💡 From a Seasoned Lab Technician: "Stop first, then retrieve" — Always stop the magnetic stirrer and wait for the stirrer to come to a complete stop before retrieving. Attempting to retrieve a spinning stirrer may cause it to fly off or damage the magnet head.
If the stirrer is firmly attached to the container bottom (especially with high-strength magnets), place the retriever head against the outer bottom wall to guide the stirrer using magnetic force before retrieval.
For large stirrers, use the Ring type retriever for more stable magnetic attachment and reduced risk of dropping during transfer.
If the retriever picks up multiple stirrers, gently tap the shaft to release excess stirrers.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Operational Safety

Always stop the magnetic stirrer before retrieving

Chemical Safety

Operations with corrosive media must be performed in a fume hood

PPE

Safety goggles, lab coat, acid/alkali resistant gloves required

Compliance

All operations should follow laboratory safety guidelines

PTFE Stirring Bar Retriever

Specifications

I. Straight Type (9mm Diameter)

II. Ring Type (10mm Diameter · Ring Magnet Head)

III. Soft Type (Flexible Shaft)

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Retrieving Magnetic Stirrers

Manual Stirring

Transferring Stirrers

Cleaning Operations

Corrosive Environment Operations

Selection Guide

I. By Container Depth

II. By Stirrer Size

III. Straight vs Ring

User Guide

I. Pre-use Preparation

II. Retrieving Operation

III. Manual Stirring Operation

IV. Cleaning & Maintenance

V. Important Notes

Care & Notes

Operational Safety

Chemical Safety

PPE

Compliance

Need PTFE Retrievers?

PTFE Stirring Bar Retriever

Specifications

I. Straight Type (9mm Diameter)

II. Ring Type (10mm Diameter · Ring Magnet Head)

III. Soft Type (Flexible Shaft)

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Retrieving Magnetic Stirrers

Manual Stirring

Transferring Stirrers

Cleaning Operations

Corrosive Environment Operations

Selection Guide

I. By Container Depth

II. By Stirrer Size

III. Straight vs Ring

User Guide

I. Pre-use Preparation

II. Retrieving Operation

III. Manual Stirring Operation

IV. Cleaning & Maintenance

V. Important Notes

Care & Notes

Operational Safety

Chemical Safety

PPE

Compliance

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