Magnetic Stir Bars

  A New Idea In Magnetic Stirrers

Sandwich Protected NdFeB Cores For Vigorous Stirring In Any Shape

V&P Scientific is proud to introduce our new VP 772F and VP 772T series of PTFE encased Neodymium Iron Boron (NdFeB) Magnetic Stirring elements.   Neodymium is the strongest of the permanent magnetic materials but you haven't seen it offered as a magnetic stirrer as the temperature required by the PTFE encapsulating  process destroys the magnetic characteristics of Neodymium (NdFeB).  Without a way to protect the Neodymium from the solution to be stirred and without a barrier to prevent leaching of the NdFeB into the solution it was not possible to use Neodymium as a stir device. 

V&P has solved that problem with our new "Sandwich" technique for encasing the neodymium in protective layers of PTFE and Parylene (patent pending).  This ability allows us to produce very powerful Neodymium (48 MGO) stir bars and other shapes that are now capable of greater coupling to the drive magnet and thereby achieving higher stirring speeds for a  more rapid mixing action and the stirring of extremely viscous solutions.  This is a proprietary process and V&P is the only source of PTFE protected neodymium stir elements. 

Another advantage of this process is that it is very easy to make custom shapes to fit specific applications.  You don't have to search for a stirrer that will fit your vessel - just tell us the shape and length you need and we will make it for you in less than 2 weeks.

Still yet another advantage of this system is that you can use either NdFeB or the more temperature resistant SmCo magnetic discs.  So in applications where you want to stir and heat the reaction mixture between 150C and 300C, or want to autoclave the stir elements to sterilize them, you should select the SmCo drive magnets.  NdFeB highest operating temperature is 80C and SmCo is 300C.

VP 772F Series

The VP 772F series is a new concept in magnetic stirrers.  The VP 772F  features pairs of parylene encapsulated NdFeB or SmCo magnetic discs with a 1.58 mm thick pocketed sheet of PTFE sandwiched in between (Patent Pending). 

An N in the part number indicates that the discs are NdFeB

An S in the part number indicates that the discs are SmCo

An A at the end of the part number indicates that the magnets in the discs have opposite polarity for conventional and horizontal stirrers.

No letter at the end of the part number indicates that the magnets in the discs have matching polarity for vortex and tumble stirrers.

The PTFE sheet can be made to any shape to accommodate the internal dimensions of any vessel as illustrated in the photo to the right.  Multiple pockets to accommodate multiple magnetic discs are also possible as indicated in the photo.  All these stirrers were designed to be small enough (width) to fit through the neck of the bottle and long enough to cover the internal diameter of the bottle for maximum surface contact.  When placed on a VP 708 Vortex Lateral Tumble Stirrer the flat shape of the VP 772F stands up on edge and becomes a "paddle" capable of moving large volumes of liquid with ease.  These stir elements can also be used with conventional horizontal magnetic stirrers.

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

VP 772FN-17-64 & VP 772FN-17-64A

The VP 772FN-17-64 was designed to be used by conventional magnetic stirrers as a low profile stirrer that lays flat on the bottom of the vessel such as the magnetic stirrers on the Beckman FX robot so that the maximum amount of fluid can be recovered from the reservoir.

An A at the end of the part number indicates that the discs are for conventional and horizontal stirrers.

No letter at the end of the part number indicates that the discs are for vortex and tumble stirrers.

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

VP 772FN and VP 772FS PTFE Disc Series

The PTFE disc series Sandwich style stir elements protect the parylene coated NdFeB and SmCo discs inside a ring of PTFE.  The PTFE discs are available in the following diameters: 5 mm, 5.1 mm, 8 mm, 13 mm and 24 mm.  The 5, 8 and 13 mm diameter discs are 1.6 mm thick, the 5.1 mm disc is 2.27 mm thick, and the 24 mm diameter disc is 4.8 mm thick (VP 772FN-5-5, VP 772FN-5-5A, VP 772FN-8-8, VP 772FN-13-13 and VP 772FN-24-24).

Follow this link for detailed dimensions and sizes.

The disc series Sandwich style stir elements can be used with our Horizontal Tumble Stirrers, Vortex lateral Tumble Stirrers and conventional magnetic stir plates.

The advantage of Neodymium Iron Boron discs is that they are significantly stronger and less expensive than the Samarium Cobalt discs.

The same PTFE disc series can be used to protect parylene coated SmCo discs
(VP 772FS-5-5, VP 772FS-8-8, VP 772FS-13-13 and VP 772FS-24-24).  The only difference between these two series besides the type of magnetic disc is the number of SmCo discs in the VP 772FS-24-24 which is 4 (two on each side as the VP 782S-21 are half the thickness of the VP 782N-21).

Follow this link for detailed dimensions and sizes.

The advantage of the Samarium Cobalt discs is they can be used in high temperature applications, up to 300^o C, however it should be noted that parylene will protect only to 200^o C.   Neodymium Iron Boron discs can only be used at temperatures less than 80^oC.

VP 772FN and VP 772FS Tuning Fork and Rectangular Series

Our miniature "Sandwich" style stir elements in the VP 772FN-5, VP 772FN-6, VP 772FS-5 and VP 772FS6 series were designed to work with glass vials in 96 well reaction blocks or 96 deep well microplates.  These stir elements are powered by either 48 MGO NdFeB magnetic discs (VP 782N-3) or VP 782S-3 and are capable of stirring solutions as viscous as honey.  See the  movie on this page.

The "Tuning Fork" (TF) design has proven to be very efficient in mixing two liquids with dissimilar specific gravities.  The rectangular blade design produces very strong vortexes.  The "V" shape is very useful in stirring PCR plates where the "V" shape of the stirrer matches the conical shape of the PCR well. 

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

Download Video VP 772FN Series
(mpeg movie- 11.0MB)

Press the play button to view the video in a flash format, flash must be installed, or click the download link to download a mpeg version.

Another advantage of the Tuning Fork design is that pipet tips can be placed into the tip of the Tuning Fork and samples removed while the stirrer is still spinning.  The photo to the right illustrates this ability with a pipet tip inserted. 

The VP 772FN-6-16TF is a second generation design change with a wider stirrer to stabilize the central position of the Tuning Fork within the well and the lowering of the magnetic discs to reduce the dead volume.

It works most efficiently with our VP 708A Vortex Stirrers or conventional stir plates.

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

The VP 772F_-6-16TFP is a third generation design change incorporating a pivot point on the bottom and "wing tips" on the top of the tuning forks (arrows).  This design reduces the friction between the stir element and the vessel by reducing the area of contact.  It also reduces grinding and shear forces if the solution contains a particulate matter.  It is available with NdFeB drive magnets (VP 772FN-6-16TFP) or with SmCo drive magnets (VP 772FS-6-16TFP). 

These stirrers are designed to fit into the glass tubes in 96 well blocks as well as deep well microplates.

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

VP 772FS-10-35TF & VP 772FN-10-35TF

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

VP 772FS-13-67TFP & VP 772FN-13-67TFP

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type. 

VP 772FS-13-29TF & VP 772FN-13-29TF
VP 772FS-16-30TF & VP 772FN-16-30TF

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

VP 772FS-25-55TF & VP 772FN-25-55TF

The VP 772FS-25-55TF and VP 772FN-25-55TF were designed to fit inside 50 ml centrifuge tubes.  The outer shape of the stirrer matches the inside topography of the tube.  The Tuning Fork design accommodates the taking of samples while the tube is being stirred.  The stirrer is powered by either two VP 782S-12 Samarium Cobalt magnetic discs or two VP 782N-12 Neodymium Iron Boron magnetic discs.  It works most efficiently with our VP 708A Vortex Stirrers or conventional stir plates.

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

VP 772FS-6-34MB & VP 772FN-6-34MB

The VP 772FS-6-34MB and VP 772FN-6-34MB were designed to mix magnetic beads in microcentrifuge tubes.  The magnetic disc part of the stirrer is kept out of the liquid to prevent magnetic beads from being collected there.

The flat PTFE blade has 2 flat pockets which encase 2 parylene coated 3.45mm diameter magnets (either NdFeB or SmCo) that are 0.73 mm thick.  The PTFE blade is 1.58mm thick, 5.45mm wide and 33.9mm long. Sold in pkg of 10.

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

Download Video of VP 772FN-6-34MB in action
(mpeg movie- 7.6MB)

Press the play button to view the video in a flash format, flash must be installed, or click the download link to download a mpeg version.

VP 772FS-25-105MB & VP 772FN-25-105MB

The VP 772FS-25-105MB and VP 772FN-25-105MB were designed to mix magnetic beads.  The magnetic disc part of the stirrer is kept out of the liquid to prevent magnetic beads from being collected there.

PTFE flat pocket encasing 2 parylene coated 12mm diameter magnets, 2.3mm thick blade, 24.8mm wide with ears and 104.7mm long. pkg of 10.
 

Follow this link for detailed dimensions and sizes in the NdFeB magnet type.

Follow this link for detailed dimensions and sizes in the SmCo magnet type.

Download Video of VP 772FN-25-105MB in action
(mpeg movie- 6.7MB)

Press the play button to view the video in a flash format, flash must be installed, or click the download link to download a mpeg version.

VP 772-CF25

Stir element set to mix in 500 ml centrifuge vials.  Set includes:

• one PTFE sandwich stir element 3/8" thick

• one tube 4mm od x 3mm id, 8.90" long.

• one PTFE bushing 1/4" od, 1/4" long pressed into stainless steel tube.

The photo to the right shows the VP 772-CF25 being used with VP 706B-1 "Mini Stirrus"

Download Video of VP 772-CF25 in action
(mpeg movie- 7MB)

Press the play button to view the video in a flash format, flash must be installed, or click the download link to download a mpeg version.

VP 772FN-14-34CP

Another new innovation in stirring 6 well microplates the VP 772FN-14-34CP was designed to stir while only touching the center and outside edge of the microplate
 

Umbrella Stirrers - VP 772FNU-24 & VP 772FSU-24

The newest of our innovations in stirring in microplates are the Umbrella Stirrers
VP 772FNU-24 and VP 772FSU-24.  The Umbrella Stirrers are constructed out of PTFE with our unique sandwich pockets for the magnets positioned above the support plate to keep the stirrer from touching the bottom of the microplate.   These Umbrella Stirrers allow for mixing in 24 well microplates without touching the bottom or sides of the wells.  Thus cells or other objects on the bottom of the wells will not be damaged or disturbed when new compounds or reagents are added to the wells and mixed.  These stirrers are capable of mixing solutions as viscous as 90% honey.  See video

This system can also be used to mix magnetic beads as the stirrer's magnet is not in contact with the liquid.

These stirrers are designed to only work with our VP 708 series Vortex Stirrers.

Download Video of VP 772FNU-24 in action
(mpeg movie- 28MB)

Press the play button to view the video in a flash format, flash must be installed, or click the download link to download a mpeg version.

The Umbrella system consists of an autoclaveable polycarbonate support plate
VP 772FNU-24P with 24 holes to accommodate the VP 772FNU-24 and VP 772FSU-24 Stir Elements see arrow.  The microplate lid fits on top of this support plate.

This type of stirrer can also be custom made for 48 and 96 well microplates.

Umbrella stirrers on VP 708-CON vortex Stirrer.

Paddle/Trapeze Style Stirrers

The VP 791P series Paddle/Trapeze stir elements are constructed of PTFE Paddles and Frames with Nylon bearings and magnetic discs coated with parylene to drive the Paddles.  The Paddle/Trapeze design minimizes the contact with the bottom of the vessel.  These stir discs are either made with NdFeB (42 MGO), NdFeB (52 MGO), or SmCo (29 MGO) Magnets.   The higher the MGO rating the more powerful the stirrer and the greater the viscosity of liquid that can be stirred.  The reason for the variety in the type of magnetic disc has to do with the cost and sensitivity of the various magnetic materials to high temperatures.  Thus we have provided a selection of stirrer magnetic material to accommodate our customer’s stirring applications while the mechanical (PTFE- Nylon) part is identical.

Click this link for more informaion on the Paddle/Trapeze Style Stirrers.

VP 772T-6 Series

The 48 MGO NdFeB magnetic cores in the VP 772T series stir bars provide vastly improved magnetic coupling to the drive magnet on a conventional horizontal stirrer or one of our V&P Stirrers (VP 710 series and VP 708 series).  The greater magnetic coupling means faster stirring speeds and the ability to stir material previously considered too thick to stir (honey, tooth paste and even bread dough).  Because our V&P Stirrers also use very large 48 MGO NdFeB drive magnets, when used with the VP 772T series stir bars you can stir the most difficult solutions in any size or shape of vessel.

The VP 772T-6 series features parylene encapsulated NdFeB magnetic cores sandwiched in PTFE tubing.  The tubing outside diameter is 6.35 mm and the length of the stir bars varies from 11 to 87 mm as illustrated in the photo to the right.

Follow this link for detailed dimensions and sizes.

VP 772T-11 Series

  Conventional PTFE Encapsulated Stir Elements (Alnico and Samarium Cobalt)

These stir bars can be used for both Tumble Stirring and Vortex Tumble Stirring applications as well as conventional horizontal spinning.    Whether you call them Magnetic Spinning Bars, Stirring Magnets or Magnetic Stir Bars we have one of the largest collections at the best prices. 

We also offer  Alnico V and Samarium Cobalt magnets conventionally encapsulated in PTFE.  These stir bars and discs are shown in the photo to the right. In addition to the permanent magnet stirrers we also offer magnetic stainless steel  Stir elements (discs, dowels and bars) and Stir StiXs.  The stainless steel stir elements are more cost effective and many of our customers treat them as disposables.  They are available uncoated, coated with cost effective parylene and encapsulated with PTFE.

• Isostatic encapsulation with PTFE to eliminate cracks and porosity
   

• FDA approved PTFE
   

• Alnico V and Samarium Cobalt magnet cores
   

• Polished finish to reduce pick-up and cross contamination
   

• Sterilize using thermal or chemical means
   

• High performance stirring bars at "disposable" prices
   

• Broad range of chemical resistance

Our stir bars range in diameter from 1.5 mm to 8 mm and from 2 mm to 87 mm in length.  The shapes also are diverse, from round, to rectangular, crosses and octahedral.  The number after the hyphen of the VP part number is the length of the stir bar in mm.

VP 773 Series

VP 773 Alnico magnet Stir Crosses come in a variety of shapes and sizes.

Follow this link for detailed dimensions and sizes.

VP 773W Series

VP 773W Alnico and rare earth magnetic winged stirrers.

Follow this link for detailed dimensions and sizes.

VP 774 Series

The VP 774 series stir bars have a diameter from 1.5 to 2 mm and have Alnico cores.

Follow this link for detailed dimensions and sizes.

VP 775 Series

The VP 775 series stir bars have a diameter of 3 mm and all have Alnico cores except for VP 775-35 which has a Samarium Cobalt core.

Follow this link for detailed dimensions and sizes.

VP 776 Series

The VP 776 series stir bars have a diameter of 6 to 8 mm.

Follow this link for detailed dimensions and sizes.

VP 776-15

Oval PTFE encapsulated alnico magnet, 15mm x 6mm.

Follow this link for detailed dimensions and sizes.

VP 778 Series

The square design of the VP 778 series stir bars makes them slightly more efficient at  moving liquid and thereby stirring a solution either in the tumble or spin mode.  The square dimension of these stir bars is from 4x4 mm to 7.5x7.5 mm.

Follow this link for detailed dimensions and sizes.

Most of the above magnetic stir bars feature ALNICO V magnetic cores which are one of the most powerful permanent magnet alloys available. Offered in many shapes from round, octagonal, and square, these PTFE encapsulated magnetic stir bars resist harsh chemicals and are resistant to scratching and high temperatures.

There are several measures that should be used to increase the life span of magnetic stir bars. First, Stir Bars should be stored in pairs to maintain magnetic strength. Stir bars should not be stored in a random mass or dropped on a hard surface especially steel.

  Samarium Cobalt Magnetic Stir Bars  (29 MGO)

VP 777 Series

Stirring very viscous solutions often requires the extra magnetic energy of a Rare Earth (Samarium Cobalt or Neodymium Boron) magnet.  Our Alligator Tumble Stirrers can stir even the most viscous solutions when using these VP 777 series Stir Bars and the VP 779 series Stir Discs.  The VP 777 series stir bars have a diameter of 6 to 8 mm and the VP 775-35  Samarium Cobalt stir bars have a diameter of 3 mm.  More Rare Earth Stir bars and Discs will be added to this series in the future.

One of the distinct advantages of Samarium Cobalt is that it is heat stable to 300C so it can be autoclaved and heat sterilized without losing magnetic strength.  It can also be used a stir element in heated reaction vessels.
 

Follow this link for detailed dimensions and sizes.

  **NEW** Samarium Cobalt Magnetic Stir Discs (29 MGO)

VP 779 Series

The disc design of the VP 779 series makes them significantly more efficient at  moving liquid and thereby mixing solution in the tumble mode.  Selecting a disc that is slightly smaller than the inside diameter of the vessel to be stirred results in the most efficient stirring.  To stir viscous material requires greater energy so we constructed these discs from Samarium Cobalt and encapsulated them with PTFE to make them inert.

The VP 779-5 (5 mm diameter x 1.8 mm thick) PTFE encapsulated disc was designed to fit into 96 well microplates, deep well 96 well microplates and glass micro-tubes.

The VP 779-13 (13 mm diameter x 1.8 mm thick) PTFE encapsulated disc was designed to fit into many vials.  If your application requires a different diameter let us know.

One of the distinct advantages of Samarium Cobalt is that it is heat stable to 300C so it can be autoclaved and heat sterilized without losing magnetic strength.  It can also be used a stir element in heated reaction vessels.
 

Follow this link for detailed dimensions and sizes.

Watch Video of the VP 779-5 and VP 779-13 Mixing In Honey
(mpeg movie- 19.8MB)

VP 779-6

The VP 779-6 disc is a Nickel coated  Samarium Cobalt disc 6.3 mm in diameter and 2.5 mm thick.  The greater thickness and mass of this magnet yields more magnetic flux and it is used to stir very viscous materials in the wells of micro plates (96).  It will mix and knead bread dough as well as mix dyes into slurries as thick as tooth paste.

Follow this link for detailed dimensions and sizes.

  Parylene Encapsulated SmCo & NdFeB Magnetic Discs

VP 782S Series

The VP 782S series Parylene encapsulated Samarium Cobalt discs were designed to be used in the pockets of the VP 772F PTFE shapes to provide the magnetic core.  The VP 772F protects the softer Parylene coated discs.  The Number after the VP 782S indicates the diameter of the disc in mm.

These stir discs can be used without a protective PTFE shell in some one time stirring applications that require an economical disposable stirrer.

Follow this link for detailed dimensions and sizes.

VP 782N Series

The VP 782N series Parylene encapsulated Neodymium Iron Boron discs were designed to be used in the pockets of the VP 772F PTFE shapes to provide the magnetic core.  The VP 772F protects the softer Parylene coated discs.  The Number after the VP 782N indicates the diameter of the disc in mm.

These stir discs can be used without a protective PTFE shell in some one time stirring applications that require an economical disposable stirrer.

Follow this link for detailed dimensions and sizes.

  Parylene Encapsulated SmCo & NdFeB Magnetic Cylinders

VP 782NC Series

VP 782NC-2-6 Neodymium Iron Boron (48 MGO) magnetic cylinder coated with parylene to make it inert. 2.15 mm in diameter and 6.44 mm long.

VP 782NC-3-6 Neodymium Iron Boron (48 MGO) magnetic cylinder coated with parylene to make it inert. 3.19 mm in diameter and 6.45 mm long.

VP 782NC-8-13 Neodymium Iron Boron (48 MGO) magnetic cylinder coated with parylene to make it inert. 7.95 mm in diameter and 12.8 mm long.

These stir cylinders can be used without a protective PTFE shell in some one time stirring applications that require an economical disposable stirrer.

Follow this link for detailed dimensions and sizes.

  Nickel Coated NdFeB Magnetic Elements

VP 783 Series

VP 783NS-3-3-3 Neodymium Iron Boron (42 MGO) magnetic tumble stir cube coated with nickel, 3.2mm x 3.2mm x 3.2mm, 100/PKG

VP 783NC-3-6 Neodymium Iron Boron (48 MGO) magnetic tumble stir cylinder coated with nickel, 3.0mm diameter and 6.3mm long, 10/PKG
 

VP 783NC-3.5-6 Neodymium Iron Boron (48 MGO) magnetic tumble stir cylinder coated with nickel, 3.5mm diameter and 6.3mm long, 10/PKG

VP 783NC-6-9 Neodymium Iron Boron (42 MGO) magnetic tumble stir cylinder coated with nickel, 6.4mm diameter and 9.5mm long, 10/PKG
 

Follow this link for detailed dimensions and sizes.

  Dispensers For Magnetic Stir Bars

VP 775-A autoclaveable Drop Dispensers are used to place  sterile PTFE encapsulated magnetic stir bars into wells or vials after the liquid is added.  When used in conjunction with the VP 771 magnet the Stir Bars stand on end and fall into the loading holes.  Simple as 1, 2, 3.  This VP 775-A series  48 place dispenser can be sterilized by autoclaving or by heating in a hot air oven.

The magnet Stir Bar Dispenser solves one of the most difficult problems that has plagued scientists who were trying to do high through put stirring or fermenting of viscous solutions ... getting the clump of magnets into multiple vials easily.

As demand warrants we will make more of these dispensers to accommodate our customers' needs and applications.

The VP 775-A dispenser contains  48 ordered holes in a top loading plenum that is 6 mm deep.  By adding additional plenums that are 2 mm, 4 mm and 6 mm thick, four different lengths (6, 8, 10 and 12 mm) of the VP775 series Stir Bars can be accommodated (VP 775-6, VP 775-8, VP 775-10 and VP 775-12). The holes in the plenums are just large enough to accommodate just one Stir Bar.  This system is similar to those we have made for loading Stir StiXs into deep well microplates or vials.  Details of how they work is on this link.

The VP 775-A magnet Stir Bar Dispenser solves one of the most difficult problems that has plagued scientists who were trying to do high through put stirring or fermenting of viscous solutions ... getting the clump of magnets into multiple vials easily.

As demand warrants we will make more of these dispensers to accommodate our customers' needs and applications.

Now that you have the Stir Bars in the vials -- follow this link for an easy way to get them out without cross contamination -- the VP 772A.

  **NEW**
  Drop Tumble Stirrer Dispenser For Samarium Cobalt Magnetic Discs

VP 779-5A

The Newest Drop Dispenser (VP 779-5A) solves the problem of loading magnetized discs into microplates.  We have been working a long time and have tested many prototypes to solve the interaction of the magnets sticking together and not loading into the plenums.   The VP 779-5A is an engineering feat that makes loading the very strong VP 772FS-5-5 Samarium Cobalt discs easy to do.  First stacks of 12 VP 772FS-5-5 are loaded into 8 chambers in the loading jig.  Spring loaded plungers are used to force  the discs into the plenum as the jig slides across. 

The dispenser also has a retaining lid to keep the magnetic discs in place until they are dropped  into the microplate.  When all 8 chambers are loaded the spring loaded plungers place into the loading jig to push the discs into the plenum as the operator pushes the loading jig across the plenum as shown at the right.

As the loading jig advances across the plenum, discs are dropped into each hole, an attached retaining lid prevents the magnets from moving about.  This operation is done on top of a VP 770B magnetic block to facilitate the loading process and to pull the magnetic discs into the microplate when the loading plenum is pushed to the open position as demonstrated in the photo to the right.

Once dispensed, the magnetic discs are captured in the microplate with a plate lid and removed from the magnet. 

When removed from the VP 770B the magnetic discs are attracted to discs in neighboring wells.  When place on a V&P Tumble Stirrer they are attracted to the Stirrer's magnetic cylinder and begin to tumble independently.

Watch an instructional video of how to use the VP 779-5A

Download video (mpeg movie- 25MB)

Press the play button to view the video in a flash format, flash must be installed, or click the download link to download a mpeg version.

  Stir Bar Retriever

The VP 782NC-3-6R combines the strength of our Neodymium Iron Boron magnetic cylinders with the reach of a 127 mm long stainless steel rod.  The powerful NdFeB magnet is able to remove alnico stir elements weighing up to 8.5 grams (VP 776-50) and NdFeB stir elements weighing up to 55 grams.  55 grams is much heavier than any of our NdFeB stir elements, so all our NdFeB magnetic stir elements are removed with the retriever.

 
  Type of Magnet- NdFeB

  Type of Magnet - SmCo

  Type of Magnet - Alnico V