Specifications

Component List

All components listed below are included in this kit. Items marked Optional can be customized.

Available Joint Sizes · GB/ISO/ASTM Standards

All sizes share 1:10 standard taper — GB, ISO, and ASTM sizes are interchangeable

14/19 19/26 24/29 (GB·recommended) 29/32 34/35 · 45/40 · 50/42 custom

GB (Chinese) 14/19 · 19/26 · 24/29 · 29/32 ISO 14/19 · 19/26 · 24/29 · 29/32 ASTM (American) 14/20 · 19/22 · 24/40 · 29/42

* All components have matching joint sizes for full system compatibility. ASTM and GB/ISO sizes share 1:10 taper — seal lengths differ but are interchangeable.

Component	Standard Spec	Available Joint Sizes	Upgrade Options	Qty	Link
Please contact us to confirm the available specifications.

📌 Customization Notes:
• Joint size can be selected to match your existing lab system:
GB (Chinese): 14/19 · 19/26 · 24/29 · 29/32
ISO: 14/19 · 19/26 · 24/29 · 29/32
ASTM (American): 14/20 · 19/22 · 24/40 · 29/42
• Stirrer blade options: PTFE (standard), Stainless Steel, Anchor, Turbine — choose based on system viscosity
• Flask can be upgraded to four-neck for an additional addition port or gas inlet
• All optional specifications can be freely combined with no minimum order quantity
• For special requirements, please contact our technical team

💡 Recommended Add-Ons: Thermometer (0–200℃) · Anti-bumping granules · Silicone tubing (Φ8mm × 2m) · Stirrer support stand · Sealing rings/vacuum grease (if sealing is required)

Product Description

I. Principle & Function

The heated stirring synthesis apparatus is a multifunctional reaction platform developed from the standard reflux setup. The key innovation is the use of a three-neck round-bottom flask — each neck serves a distinct function:

Center Neck — For the stirrer, providing mechanical agitation for uniform heating and thorough mixing
Side Neck 1 — For the spherical condenser, enabling reflux and preventing solvent loss
Side Neck 2 — For the thermometer adapter (or dropping funnel/gas inlet), enabling temperature monitoring or functional expansion

Heating, reflux, and stirring operate simultaneously, ensuring the reaction proceeds under homogeneous, constant-temperature conditions. Compared to single-neck flasks, the three-neck design solves the problem of ineffective stirring in conventional reflux setups — ideal for multiphase reactions, heterogeneous systems, high-viscosity media, and syntheses requiring precise temperature control.

✦ Comparison with Standard Reflux: Standard Reflux: Single-neck flask — heating and reflux only, difficult to stir.
Heated Stirring Synthesis: Three-neck flask — heating + reflux + stirring simultaneously.
Best for: Multiphase reactions, heterogeneous synthesis, polymerization requiring agitation.

II. Apparatus Components & Functions

Three-Neck Round-Bottom Flask — Core reaction vessel; three-neck design supports multiple interfaces; capacity based on reaction scale
Mechanical Stirrer — Provides agitation power; typically 100–1500 rpm adjustable with PTFE stirrer blade
Spherical Condenser — Core reflux component; condenses vapor and returns it to the reaction system
Thermometer Adapter — Monitors reaction temperature; bulb immersed below the liquid surface
Heating Mantle (or Oil Bath) — Provides uniform, controllable heat — often with magnetic stirring capability
Iron Stand & Universal Clamps — Secure the flask, condenser, and stirrer; ensure stability

III. Stirrer Type Comparison

PTFE Paddle Stirrer — Standard configuration; corrosion-resistant, non-contaminating; suitable for most organic syntheses
Stainless Steel Paddle Stirrer — Suitable for high-temperature reactions; high mechanical strength
Anchor Stirrer — Suitable for high-viscosity systems; excellent wall-scraping performance
Turbine Stirrer — Suitable for emulsification and dispersion requiring high shear force

IV. Material & Workmanship

All glass components are manufactured from borosilicate glass 3.3. All ground joints are precision-machined to the standard 1:10 taper, available in GB, ISO, and ASTM standard sizes. The stirrer blade is made from corrosion-resistant PTFE, compatible with glass flasks.

This apparatus is designed and manufactured in compliance with GB/T 21298-2017 "Laboratory Glassware — Distillation Apparatus".

Applications

Typical Applications

Multiphase Reactions

Liquid-liquid, liquid-solid, gas-liquid multiphase reaction systems

Heterogeneous Synthesis

Suspended catalysts, solid-participating reaction systems

Polymerization

Radical polymerization, polycondensation — reactions requiring uniform mixing and temperature control

Fine Chemicals

Synthesis of dyes, flavors, pharmaceutical intermediates

Materials Preparation

Nanomaterials, polymer materials synthesis

Teaching Labs

Core experimental instruction in organic chemistry and polymer chemistry

System Type	Recommended Blade	Characteristics
Please contact us to confirm the available specifications.

Operation & Maintenance

User Guide

The following is the standard operating procedure for the heated stirring synthesis apparatus. Stirrer installation and adjustment are critical steps.

🚨 Critical Sequence (DO NOT REVERSE):
Startup: Cooling water ON → Start stirrer (low speed) → Heat → Adjust to target speed
Shutdown: Turn off heat → Cool → Stop stirrer → Turn off cooling water

I. Safety Check & Preparation

Inspect all glass components for cracks or chips
Check the stirrer for proper operation — ensure the blade is securely attached
Work in a fume hood — wear lab coat, safety goggles, and gloves
Confirm the heating device (heating mantle) is functioning properly
Prepare cooling water source with adequate flow

Standard assembly sequence (bottom to top)

Secure the three-neck flask on the iron stand, positioned in the heating mantle
Add reactants to the flask — fill to 1/3 to 1/2 of flask capacity
Install the stirrer in the center neck — position the blade 5–10mm above the flask bottom
Install the spherical condenser in one side neck — ensure the ground joint is properly seated
Install the thermometer adapter in the other side neck — the thermometer bulb should be immersed ~1cm below the liquid surface
Secure the flask neck, condenser, and stirrer with universal clamps
The condenser top must remain open — vented to atmosphere (never seal!)

III. Cooling Water & Stirring

Turn on cooling water first — follow bottom-in, top-out principle
Start the stirrer at 100–200 rpm (low-speed start to prevent splashing)
Observe smooth operation — no abnormal vibration or noise
Once confirmed that the shaft is not rubbing against the neck, gradually increase speed

IV. Heating the Reaction

Start the heating mantle and slowly raise the temperature to the target
As temperature increases, solution viscosity may change — adjust stirring speed to maintain uniform mixing
Once stable reflux is achieved, both stirrer and heater are in steady-state operation
Monitor reaction temperature via the thermometer adapter — ensure temperature remains within the target range

V. Addition/Sampling During Reaction

Add reagents through the thermometer adapter neck during the reaction if needed
Reduce stirring speed when adding to prevent splashing
For sampling, use a long dropper through the addition port
Seal the neck promptly after sampling to prevent solvent loss

VI. Shutdown

After reaction completion, turn off the heating device first
Keep stirring and cooling water circulating until the apparatus cools to near room temperature
Once no more condensate is returned and the system has cooled, stop stirring
When no more condensate is returned, turn off the cooling water
Disassemble in reverse order
Clean all glassware thoroughly — pay special attention to each neck of the three-neck flask and the stirrer blade
Dry and store properly

📌 Stirrer Blade Position is Critical: If the blade is too close to the bottom (< 5mm), it will scrape the glass and generate particles; too far (> 15mm) and mixing is poor, leaving bottom material unmixed. The standard position is 5–10mm from the bottom, centered.
Leave a 2–3mm gap between the shaft and the neck wall to prevent friction and contamination.

💡 From a Seasoned Lab Technician: "Start slow, heat later, then fine-tune speed" — this is the standard sequence for any stirred reaction setup.
Stirrer blade selection directly affects reaction quality: paddle blades for low-viscosity systems, anchor blades for high-viscosity, turbine blades for emulsification.
If severe vibration occurs during stirring, stop immediately and check for eccentric or bent shaft.
If you hear friction between the shaft and the neck wall, the shaft may be misaligned — stop and realign.
NEVER adjust the stirrer blade while it is running! Stop first, then adjust.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Stirrer startup

Always start at low speed to prevent splashing and blade damage

Fire/explosion prevention

When refluxing flammable solvents, NO open flame — always use a heating mantle

Electrical safety

Keep stirrer and heating mantle power cords away from heat and water sources

Standard compliance

Apparatus design complies with GB/T 21298-2017

Do not

Condenser top must be vented: Never seal a reflux system — pressure buildup risks glass rupture
Anti-bumping: NEVER add boiling stones to a hot flask! Always cool first, then add

Heated Stirring Synthesis Apparatus

Specifications

Component List

Product Description

I. Principle & Function

II. Apparatus Components & Functions

III. Stirrer Type Comparison

IV. Material & Workmanship

Applications

Multiphase Reactions

Heterogeneous Synthesis

Polymerization

Fine Chemicals

Materials Preparation

Teaching Labs

User Guide

I. Safety Check & Preparation

Standard assembly sequence (bottom to top)

III. Cooling Water & Stirring

IV. Heating the Reaction

V. Addition/Sampling During Reaction

VI. Shutdown

Care & Notes

Stirrer startup

Fire/explosion prevention

Electrical safety

Standard compliance

Need This Apparatus Kit?

Heated Stirring Synthesis Apparatus

Specifications

Component List

Product Description

I. Principle & Function

II. Apparatus Components & Functions

III. Stirrer Type Comparison

IV. Material & Workmanship

Applications

Multiphase Reactions

Heterogeneous Synthesis

Polymerization

Fine Chemicals

Materials Preparation

Teaching Labs

User Guide

I. Safety Check & Preparation

Standard assembly sequence (bottom to top)

III. Cooling Water & Stirring

IV. Heating the Reaction

V. Addition/Sampling During Reaction

VI. Shutdown

Care & Notes

Stirrer startup

Fire/explosion prevention

Electrical safety

Standard compliance

Related Apparatus Kits

Reflux Apparatus

Reflux with Dropping Addition

Soxhlet Extraction

Simple Distillation

Need This Apparatus Kit?