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PTFE Stirring Rod
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Stirring & Tools · Stirring Rod

PTFE Stirring Rod

Stainless Core + PTFE Sleeve

PTFE stirring rods feature a stainless steel core fully encapsulated in a high-purity PTFE sleeve, with blades made entirely of PTFE. Offering exceptional chemical resistance, wide temperature tolerance, and mechanical strength for all laboratory liquid stirring, mixing, and reaction operations. Available in crescent, cross, straight, flat, and propeller types with lengths from 250mm to 1000mm, compatible with vessels from 100ml to 100L.

250 – 1000 mmLength/Blade Span/Shaft
100 – 50000 mlVessel Capacity

Specifications are subject to confirmation with your enquiry.

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PTFE Sleeve Stainless Core -196℃ ~ 260℃ Acid & Alkali Resistant 5 Types Full Coverage

📐 Selection Guidelines: Consider vessel capacity, liquid viscosity, and stirring type. Crescent type is the most versatile — blades can be adjusted for easy insertion/removal. Cross type is ideal for high-viscosity liquids. Straight type suits shallow liquid layers. Propeller type delivers powerful circulation. Choose 7mm shaft for routine use, 8mm/10mm/14mm for larger vessels.

Crescent Adjustable · Most used
Cross High-viscosity
Straight Shallow layers
Flat Large contact area
Propeller Powerful circulation
  • Shaft — Stainless core + PTFE sleeve
  • Blades — Full PTFE, non-stick, corrosion-resistant
  • Temp Range — -196℃ ~ 260℃
  • Types — Crescent / Cross / Straight / Flat / Propeller
  • Length Range — 250mm ~ 1000mm, fits 100ml ~ 100L
  • Easy Mounting — Standard interface for electric mixers
We will follow up on your inquiry as soon as possible. Custom sizes supported Samples available
Specifications

Specifications

Complete specifications for PTFE stirring rods. Items marked Customizable available upon request.

Request custom specs

I. Crescent Type

Length/Blade Span/Shaft (mm)Vessel Capacity
250/40/7100ml
250/40/8200ml
250/50/7200ml
250/65/7250ml
300/40/7100ml
300/50/7200ml
300/50/8250ml
300/65/7250ml
330/50/7200ml
330/65/7250ml
350/65/7250ml
350/65/8300ml
350/75/7400ml
350/85/7500ml
400/75/7400ml
400/75/8400ml
400/85/7500ml
400/95/71000ml
450/85/71000ml
450/85/8500ml
450/95/72000ml
450/100/73000ml
500/95/72000ml
500/95/81000ml
500/100/73000ml
500/100/82000ml
500/110/74000ml
500/120/75000ml
600/110/74000ml
600/110/83000ml
600/120/75000ml
600/120/85000ml
600/145/710000ml
600/145/810000ml
700/145/810000ml
800/145/1010000ml
800/210/1020000ml
1000/195/1050000ml

II. Cross / Straight / Flat Types

TypeSize (Length/Blade Span/Shaft mm)Vessel Capacity
Cross350/64/81L
Cross350/65/81L
Cross800/145/1020L
Cross800/210/10100L
Cross1000/160/14100L
Cross (Double-layer)1000/160/14200L
Straight350/66/81L
Flat350/68/81L
Wave350/70/81L
Large Flat Paddle—500L

III. Propeller Type (3-Blade / 4-Blade)

TypeSize (Length/Blade Span/Shaft mm)Vessel Capacity
3-Blade Propeller350/57/81L
3-Blade Propeller (Double-layer)350/57/82L
4-Blade Propeller350/60/81L
4-Blade Propeller (Double-layer)350/60/82L
Custom sizes and blade shapes available upon request.
📌 Customization Options:
• Shaft Diameter: 7mm / 8mm / 10mm / 14mm available
• Core Material: Stainless steel / Hastelloy / Titanium alloy
• Blade Shape: Crescent / Cross / Straight / Flat / Propeller / Custom
• Custom sizes and blade designs available upon request — consult our technical team

Product Description

I. Overview

The PTFE stirring rod features a stainless steel core with a high-purity PTFE sleeve, and blades manufactured entirely from PTFE. Designed for use with electric overhead stirrers, compatible with laboratory flasks, beakers, reactors, and other vessels for liquid stirring operations.

The PTFE sleeve provides exceptional chemical resistance — inert to strong acids (including hydrofluoric acid), strong alkalis, aqua regia, and all organic solvents — without sample contamination or adsorption. The stainless steel core delivers mechanical strength and rigidity, preventing bending or deformation even at high rotation speeds.

The crescent type stirring rod features adjustable blades that can be closed for insertion through flask necks and opened inside the vessel with a gentle press — extremely convenient to use. Available in lengths from 250mm to 1000mm, fitting vessels from 100ml to 100L. Widely used in chemical synthesis, pharmaceuticals, materials science, and environmental testing laboratories.

II. Core Performance Parameters

  • Shaft Construction: Stainless core + PTFE sleeve, shaft diameters 7/8/10/14mm
  • Blade Material: Full PTFE, non-stick, corrosion-resistant
  • Operating Temperature: -196℃ ~ 260℃, short-term up to 300℃
  • Chemical Resistance: Resistant to HF, aqua regia, concentrated H₂SO₄, HNO₃, strong alkalis, organic solvents
  • Compatibility: Electric overhead stirrers, standard interface
  • Vessel Compatibility: 100ml ~ 100L flasks, beakers, reactors

III. Material & Workmanship

Manufactured using imported high-purity PTFE resin with precision encapsulation technology — the stainless core is fully enclosed within the PTFE layer, preventing metal contact with media and eliminating metal ion contamination risks. Blades are integrally molded with the shaft for structural integrity.

The crescent type features a specially designed blade that can be adjusted by gentle pressing — closed for insertion, then opened inside the vessel for optimal stirring efficiency.

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

IV. 5 Types Overview

TypeBlade ShapeSize RangeApplication
CrescentAdjustable crescent shape250/30/7 ~ 1000/195/10General stirring (most versatile)
CrossCross-section350/64/8 ~ 800/210/10High-viscosity liquids
StraightFlat straight blade350/66/8Shallow liquid layers
FlatLarge flat blade350/68/8Large contact area
Propeller3/4-blade helical350/57/8 ~ 1000/160/14Powerful circulation

Applications

Typical Applications

Chemical Synthesis

Organic synthesis, polymerization, catalytic reactions

Sample Dissolution & Preparation

Solid dissolution, standard solution preparation, buffer mixing

Analytical Pretreatment

Extraction, digestion, derivatization

Pharmaceutical Formulation

Drug formulation, mixing, homogenization

Materials Science

Nanomaterial dispersion, coating preparation, composite formulation

Environmental Testing

Water sample prep, soil extraction

Industries

  • Pharmaceutical Drug synthesis, formulation, QC
  • Chemical Fine chemicals, polymerization, solvent processing
  • Semiconductor Photoresist preparation, chemical mixing
  • Food Additive dissolution, sample prep
  • Research General laboratory stirring
ChemicalPTFE CompatibilityRecommended TemperatureNotes
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 BPEnsure ventilation and fire safety

Selection Guide

I. By Vessel Capacity

Vessel CapacityRecommended Rod LengthRecommended Shaft
100ml ~ 250ml250mm ~ 300mm7mm
250ml ~ 500ml300mm ~ 350mm7mm ~ 8mm
500ml ~ 1000ml350mm ~ 450mm8mm
1000ml ~ 3000ml450mm ~ 500mm8mm
3000ml ~ 5000ml500mm ~ 600mm8mm ~ 10mm
5000ml ~ 10000ml600mm ~ 800mm10mm
10000ml ~ 50000ml800mm ~ 1000mm10mm ~ 14mm

II. By Liquid Viscosity

ViscosityRecommended Type
Low (water, dilute solutions)Crescent / Straight
Medium (alcohols, oils)Crescent / Cross
High (resins, syrups)Cross / Propeller
Powerful circulation requiredPropeller (3/4-blade)
Shallow liquid layersStraight

III. Crescent Type Usage Tips

  • Blades can be adjusted by gentle pressing — close for insertion, open inside the vessel
  • After insertion, gently press the blade top to open into crescent shape
  • Provides excellent stirring efficiency with minimal vortex
  • Close blades again for easy removal through the flask neck

💡 Selection Tip: Rod length should slightly exceed vessel height to ensure blades are fully submerged below the liquid surface. For high-torque applications with large volumes, choose 10mm or 14mm shaft diameter.
For highly corrosive media, always choose full PTFE-encapsulated rods to ensure the stainless core never contacts the corrosive liquid.
The crescent type is the most versatile choice for most laboratory stirring applications.

Operation & Maintenance

User Guide

Standard operating guidelines for PTFE stirring rods. Proper use and maintenance ensure stirring efficiency and product longevity.

03

I. Pre-use Preparation

  • Inspect the PTFE sleeve for integrity — no damage or cracks
  • Check blades are intact — crescent type blades should move freely
  • Clean with ultrapure water or appropriate solvent to remove surface particles
  • Confirm rod length is suitable for the vessel (slightly longer than vessel height)
  • Ensure the electric stirrer chuck matches the rod shaft diameter
04

II. Installation & Insertion

  1. Insert the rod top into the electric stirrer chuck and tighten securely
  2. For crescent type: Close the blades and insert through the flask neck
  3. After insertion, gently press the blade top inside the flask to open the blades
  4. Adjust rod height so blades are fully submerged below the liquid surface
05

III. Stirring Operation

  • Recommended speed range: 100~2000rpm — adjust based on viscosity and vessel size
  • Avoid running dry — never operate without liquid
  • Stop immediately if abnormal vibration or noise occurs
  • Monitor liquid temperature during extended operation
06

IV. Removal & Cleaning

  • Stop the stirrer and allow the rod to come to a complete stop
  • For crescent type: Close blades before removing from the flask
  • Clean with ultrapure water or appropriate solvent — 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
06

V. Maintenance & Important Notes

  • Regularly inspect PTFE sleeve integrity — replace if damaged
  • Avoid impact with hard objects to prevent PTFE sleeve damage
  • Do not exceed rated temperature during prolonged use
  • Never use hard brushes or abrasives for cleaning
  • Store in a dry, dark place when not in use

💡 From a Seasoned Lab Technician: "Crescent type — insertion technique matters" — Close the blades completely when passing through the flask neck. Once inside, gently press the blade top — the blades will spring open into the crescent shape automatically.
For removal, close the blades again before pulling out — never force it with blades open.
Optimal blade height: Position blades 5-10mm above the vessel bottom for thorough mixing without scraping.
Always start at low speed and gradually increase — this prevents blade impact with vessel walls.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Electrical Safety

Check power cord and outlet before using electric stirrer

Chemical Safety

Corrosive chemical operations must be performed in a fume hood

Mechanical Safety

Ensure rod is securely mounted — prevent detachment during operation

PPE

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

Compliance

All operations should follow laboratory safety guidelines

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