Tumble Stir Elements

     
 


We provide stainless steel TUMBLE STIR ELEMENTS which are very efficient at stirring the contents of microwells.  These stir elements do not corrode in the presence of sodium chloride, acetic acid, citric acid, ammonia, hydrogen peroxide or sodium hypochlorite.  Also, they are not affected by organic solvents such as dimethyl sulfoxide, ethanol or isopropyl alcohol.  These stir elements have been tested and found to be non-toxic to microorganisms. The stir elements are priced low enough to be disposable, however they can be reclaimed, cleaned, demagnetized, autoclaved and then reused.  The TUMBLE STIR ELEMENTS come demagnetized and become magnetic and begin tumbling when placed in a moving magnetic field.  These same stir elements can be coated with Parylene or PTFE to shield reactions that are sensitive to iron ions or to prevent a caustic solution from attacking the stainless steel.


Click here for a list of published articles that cite using the products on this page.

     


  Tumble Stirring Action

     
 


The tumbling action of a the VP 711D Tumble Stir Dowel in a glass vial is illustrated in the photo on the right.  As the magnetic cylinder spins the dowel aligns its magnetic poles to the cylinders and tumbles vertically.  The dowel can spin at 1,000 RPM thus creating significant movement of the liquid in the vial or microplate wells.

 
 
 


Our Stainless Steel TUMBLE STIR ELEMENTS are easily placed in Microplates using our Dispenser Systems.  Because it is possible to demagnetize our special type of stainless steel, you can easily load the dispensing systems to fill the microplates. This is just not possible using permanent magnet stirrers.  The only way to get permanent magnet stirrers into microplates is manually placing them in each well one at a time.   For some applications where stirring very viscous liquids is required this is desirable.  For these applications we also offer Alnico and Rare Earth Magnet Stir Bars and Discs.

 

TUMBLE STIR ELEMENTS are available in a variety of sizes designed for maximum stirring efficiency of various microplate well diameters, shapes, and liquid depth. Inquire for the TUMBLE STIR ELEMENT that best fits your needs. TUMBLE STIR ELEMENTS are provided in bulk packages of 1,000 each.  With our economical manual Alligator Tumble Stirrer and our low cost stir dowels (VP 711D) every lab can afford to mix in microplates.

     


  Choice In Tumble Stir Element Selection

     
 


The selection of which stir element to use is based on the following considerations:

  1. Efficiency - the disc stirrers are the most efficient at stirring (moving liquid).
     

  2. Size -  chose a stir element whose longest dimension is just slightly smaller than the well diameter.
     

  3. Magnetic Strength - the bar and dowel type stirrers have the most magnetic energy and will stir wells at greater distances than the disc type stirrers will.  Of the two types of disc stirrers, the "F" series stainless steel have the most magnetic energy.  Magnetic energy is important if you want to stack microplates on top of each other, or if you place the microplates on a heating block on top of the Tumble Stirrer Deck or if the material you are stirring is very viscous.
     

  4. Cost - the bar and dowel type stirrers are the least expensive.  
     

  5. Coating - most biological stirring can be done with the stainless steel stir discs, bars and dowels.  Coated stirrers are recommended for combinatorial chemistry.
    See this page for Parylene coated stainless steel stir elements.
    See this page for PTFE encapsulated stainless steel stir elements.
    See this page for PTFE encapsulated Alnico or Samariium Cobalt stir elements

Data on how high microplates with different Stir Elements can be stacked and still mix can be found at this link.

 

 


  Micro Stir bars for stirring in micro-chambers

     
 

The photo to the right illustrates some of the smallest stainless steel stir elements we have made.

The VP 717 are  0.457mm in diameter and 1.20mm Long

The VP 718 are 0.0762mm in diameter and 1mm long

The VP 718-D are  0.0762mm in diameter and 3mm long

The VP 718-E are  0.1524mm in diameter and 3mm long

The VP 718-F are  0.2032mm in diameter and 3mm long

The VP 718-G are  0.2540mm in diameter and 3mm long

 

 
 
 


VP 718

The enlarged photo to the right illustrates how small some of our stir bars are.  The VP 718 is only 76 microns in diameter and 1000 microns long.  It is used by NASA to mix solutions in zero gravity micro chambers.  If you have a special need, no matter how small or how large or how far out in space it is, we have the capability to make stir elements of any size and shape.  You might say they even circle the globe.

 
 


  Parylene Coated Stainless Steel

     
 


Parylene is an inert polymer film that makes a conformal coating around the stirrers.  Parylene coating is useful in combinatorial chemistry where the reaction may be inhibited by Fe ions from the stirrers.  Coating with parylene further protects the stainless steel stirrers from corrosive effects of a wide variety of concentrated acids and bases.  Parylene is stable from -200șC to 200șC.  It is resistant to organic solvents and it is non-toxic and bio-compatible for medical applications, including implants.  Parylene is more cost effective than PTFE however because the parylene coating is thin it can be worn off after prolonged usage.

 

See this page for more information on Parylene coated stainless steel stir elements.


Click here for a list of published articles that cite using the products on this page.

 
 


  **NEW**
  PTFE Encapsulated Stainless Steel Stir Elements

     
 


PTFE is the ultimate inert polymer for encapsulating our stainless steel stir bars.  This thick layer can't be worn away.  The durability of PTFE coupled with the corrosive resistant properties makes it a good choice.  To determine whether you should use Stainless Steel or PTFE encapsulated Stir StiX check the Chemical Resistance Charts.

 

We offer PTFE coated stir elements for our most poplular sizes.  Whether you are mixing 96 well plates or vials we have a PTFE coated stir element for you.


VP 712-2

We have added approximately 1 mm of PTFE to our standard VP 712 stir bar so the encapsulated dimensions are 3.57 mm by 3.70 mm by 4.85 mm long.  PTFE encapsulated stir bars

 

 

VP 719F-2

We have encapsulated PTFE around our VP 719F stir disc so the diameter is enlarged to 9.46 mm and the thickness is 1.45 mm.  PTFE encapsulated stir disc

 

We have also encapsulated the Stir StiX series with PTFE. The encapsulated Stir StiXs range in length from 21.8 mm, 28.2 mm to 34.6 mm long so they will accommodate a wide variety of deep well microplates, vials or test tubes.

 
 


 
More New Magnetic Stainless Steel Tumble Stir Elements

     
 


The new F series (VP 719F, VP 721F, VP 722F and VP 724F) are made using an even more magnetic stainless steel than our original VP 719, VP 721, VP 722 and VP 724.  These stir discs have the advantage of being able to mix solutions as viscous as honey or microplates stacked four high.

Picture to the right demonstrates the VP 721F Tumble Stir Discs In Vertical Position (arrow)

 
 


 
Selection Of Stir Elements Based On The Vessel To Be Stirred

 
 


The following tables match a single stir element with the vessel they were designed to stir.  However you should keep in mind that  if you add multiple stir elements to one vessel they will magnetically couple and stack to a greater height as illustrated in the photograph to the right.

 
 
   

Multiple VP 720F can be used to mix the contents of a 60 cc syringe.

 

Follow this link to see a video of stirring in a syringe.

 
 
 
Multiple VP 720F can be used to mix the contents of a 20 cc syringe
 
 
 
Multiple VP 719F can be used to mix the contents of a 10 cc syringe
 
 
 
Multiple VP 721F can be used to mix the contents of a 3 cc syringe
 
 
 


Multiple VP 722F can be used to mix the contents of a 1 cc syringe

 
 


  Tumble Stir Elements for standard 96 Well Plates

     
   
Tumble Stir Bar, 1.57 mm x 1.91 mm x 4.75 mm VP 711
Tumble Stir Dowel, diameter 1.93 mm x 4.75 mm long VP 711D
Tumble Stir Bar, 1.57 mm x 1.91 mm x 2.90 mm VP 712
PTFE encapsulated Tumble Stir Bar, 3.57 mm x 3.70 mm x 4.85 mm VP 712-2
Tumble Stir Dowel, diameter 1.93 mm x 2.46 mm long **NEW** VP 712D
Super Tumble Stir Disc, 5.08 mm diameter, 0.61 mm thick VP 721F
Super Tumble Stir Disc, 3.35 mm diameter, 0.61 mm thick  VP 722F
   

Parylene coated Stir Elements

Tumble Stir Bar, 1.67 mm x 2.01 mm x 4.80 mm VP 711-1
Tumble Stir Dowel, 1.98 mm diameter x 4.77 mm VP 711D-1
Tumble Stir Bar, 1.67 mm x 2.01mm x 3.00 mm VP 712-1
Tumble Stir Disc, 5.13 mm diameter, .68 mm thick VP 721F-1
 


  Tumble Stir Elements for 96 Deep Well Plates

     
   
Super Tumble Stir Disc, 5.08 mm diameter, 0.61 mm thick VP 721F
Stainless Steel STIR STIX, diameter 1.58 mm, 31.8 mm long VP 733
PTFE encapsulated STIR STIX, diameter 2.50 mm, 34.6 mm long VP 733-2
Stainless Steel STIR STIX, diameter 1.58 mm, 25.4 mm long VP 734
PTFE encapsulated STIR STIX, diameter 2.50 mm, 28.2 mm long VP 734-2
Stainless Steel STIR STIX, diameter 1.58 mm, 19 mm long VP 735
PTFE encapsulated STIR STIX, diameter 2.50 mm, 21.8 mm long VP 735-2

Parylene coated Stir Elements

Tumble Stir Disc, 5.13 mm diameter, .68 mm thick VP 721F-1
 


  Tumble Stir Elements for 24 and 48 Well Plates

     
   
Super Tumble Stir Disc, 7.95 mm diameter, 0.635 mm thick VP 719F
Super Tumble Stir Disc, 9.46 mm diameter, 1.45 mm thick PTFE encapsulated VP 719F-2
Tumble Stir Disc, 9.53 mm diameter, 0.51 mm thick VP 720F

Parylene coated Stir Elements

Super Tumble Stir Disc, 8.00 mm by 0.685 mm thick  VP 719F-1
Tumble Stir Disc, 9.63 mm diameter by 0.56 mm thick VP 720F-1
 


  Tumble Stir Elements for Vials and Tubes

     
   
Super Tumble Stir Disc, 7.95 mm diameter, 0.635 mm thick VP 719F
Super Tumble Stir Disc, 9.46 mm diameter, 1.45 mm thick PTFE encapsulated VP 719F-2
Tumble Stir Disc, 9.53 mm diameter, 0.51 mm thick VP 720F
Stainless Steel STIR STIX, diameter 1.58 mm, 31.8 mm long VP 733
PTFE encapsulated STIR STIX, diameter 2.50 mm, 34.6 mm long VP 733-2
Stainless Steel STIR STIX, diameter 1.58 mm, 25.4 mm long VP 734
PTFE encapsulated STIR STIX, diameter 2.50 mm, 28.2 mm long VP 734-2
Stainless Steel STIR STIX, diameter 1.58 mm, 19 mm long VP 735
PTFE encapsulated STIR STIX, diameter 2.50 mm, 21.8 mm long VP 735-2

Parylene coated Stir Elements

Super Tumble Stir Disc, 8.00 mm by 0.685 mm thick  VP 719F-1
Tumble Stir Disc, 9.63 mm diameter by 0.56 mm thick VP 720F-1
 


  Tumble Stir Elements for 384 Well Plates

     
   
Tumble Stir Dowel, 1.27 mm diameter, 1.52 mm long VP 716
Super Tumble Stir Disc, 1.78 mm diameter, 0.635 mm thick VP 724F

Parylene coated Stir Elements

Tumble Stir Dowel, 1.32 mm diameter, 1.57 mm long VP 716-1
Tumble Stir Disc, 1.87 mm diameter, 0.68 mm thick VP 724F-1
 


 
Tumble Stir Elements
for V Bottom Plates and Micro Centrifuge Tubes

 
   
Tumble Stir Dowel, 1.27 mm diameter, 1.52 mm long VP 716
Super Tumble Stir Disc, 3.35 mm diameter, 0.61 mm thick VP 722F
Super Tumble Stir Disc, 1.78 mm diameter, 0.63 mm thick VP 724F

Parylene coated Stir Elements

Tumble Stir Dowel, 1.32 mm diameter, 1.57 mm long VP 716-1
Tumble Stir Disc, 1.87 mm diameter, 0.68 mm thick VP 724F-1
 


  Tumble Stir Elements for 1536 Well Microplates

     
   
Tumble Stir Dowel, 0.457 mm diameter, 1.20 mm long VP 717

Parylene coated Stir Elements

Tumble Stir Dowel, .52 mm diameter, 1.26 mm long VP 717-1
 


  Tumble Stir Elements for micro mixing chambers

     
   
Tumble Stir Dowel, 0.457 mm diameter, 1.20 mm long VP 717
Tumble Stir Dowel, 0.0762 mm diameter, 1.00 mm long VP 718
Tumble Stir Dowel, 0.0762 mm diameter, 3.00 mm long VP 718-D
Tumble Stir Dowel, 0.1524 mm diameter, 3.00 mm long VP 718-E
Tumble Stir Dowel, 0.2032 mm diameter, 3.00 mm long VP 718-F
Tumble Stir Dowel, 0.2540 mm diameter, 3.00 mm long VP 718-G
 
 
     
 


  **NEW** Stir StiX

     
 


One of our customers approached us with a problem they were having in dissolving compounds that floated on the top of the liquid in glass vials.  Being able to soluabilize new compounds is a very basic yet essential requirement in many applications.  Our solution was to develop a Stir StiX that was very magnetic and taller than meniscus level in the vial, so the surface of the liquid and the compound are vigorously mixed as the Stir StiX moves back and forth.  These are now available in Stainless Steel and encapsulated in PTFE. 

We have also found many new stirring applications for the Stir StiX as they produce a very vigorous stirring action in many different vessels.

 
 


  Tumble Powder For 24, 48, 96, 96 Deep Well, 384, & 1536 Well Plates

 
 


We also offer a magnetic powder with 0.7m diameter particles that come together in the strong magnetic field to form many magnetic stalagmites in the bottom of the wells of microplates.  The tumbling action of these stalagmites on our Magnetic Tumble Stirrers provides a very efficient yet gentle stirring of the liquid

They also are useful in stirring solutions with magnetic beads.  Stirring in microwells increases the exposure of magnetic beads to ligands in the solution. The tumble powder is added to wells as a liquid slurry.

 
 


  Magnetic Replicators For Extraction Of Stirrers From Microplates

 
 


Some stirring operations require that the stirrers be removed with out contaminating the liquid in wells and preventing cross contamination between wells. We have developed a system of MULTI-BLOT™ Replicators with magnetic stainless steel pins that when used with a Magnetic Block System will safely extract stirrers from both standard microplates and deep well plates.

 
 
 
 
MULTI-BLOT™ 96 Magnetic Pin Replicator, pin diameter = 1.58 mm, 21.8 mm long magnetic stainless steel pins
 VP 408M
MULTI-BLOT™ 96 Deep Well Replicator, pin diameter = 1.58 mm,  57 mm long magnetic stainless steel pins  VP 408AM
MULTI-BLOT™ 96 Pin Magnetic Pin Replicator, pin diameter = 2.36 mm, exposed Replicator pin length = 21.8 mm  VP 407M
MULTI-BLOT™ 96 Pin Magnetic Pin Replicator for 4 ml deep well plates, pin diameter = 2.36 mm, exposed Replicator pin length = 57 mm  VP 407AM
MULTI-BLOT™ 384 Pin Replicator with 21.8 mm long magnetic stainless steel pins  VP 384M
Magnetic Block System for loading and unloading stirrers  VP 770
 
 
 

Follow this link to more magnetic replicators and magnets to load the replicators.

     
 


Click here for a list of published articles that cite using the products on this page.

     
         

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