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  1. Pre-Pulled Micropipettes, Perfect for Closed Container Integrity Testing
    February 02, 2021
      WPI pre-pulled pipettes (MicroTips) are
  2. Buying Glass Capillaries for Making Micropipettes and Microelectrodes
    April 29, 2013
    WPI offers a wide spectrum of high-quality glass capillaries. We take pride in our ability to ship your glass order within 48 hours. If you need a special glass that does not appear in our catalog, please call us. We will make every effort to provide it for you. Fire-Polished glass capillaries are easier to insert into microelectrode holders without damaging the gasket. More importantly, fire-polished glass won’t scratch the chloridized wire used in a recording electrode. Fire-polishing does not affect the glass’s mechanical or electrical properties. Borosilicate glass capillaries: Close dimensional tolerances assure microelectrode uniformity and reproducibility. Available in one-, two-, three-, five- and seven-barrel configurations, a complete range of single barrel thin-wall sizes, and a variety of special configurations. Capillaries with filaments contain a solid filament fused to the inner wall, which speeds filling of electrodes. Capillaries with or without inner filaments are available for making microelectrodes in a wide range of diameters. Single Barrel standard wall thickness capillaries are offered either with or without inner filaments for quick filling in a variety of lengths and diameters. Two usable electrodes can be made from one 6-inch length. Borosilicate glass is either Corning 7740 or N51A, depending on the part number. Contact WPI Technical Support for specifications for your part number. Thin Wall single barrel capillaries are offered both with or without inner filaments. The concentricity of this material provides excellent strength. Micropipettes made from thin wall capillaries have fine tips with a short taper. NOTE: Because electrode tips erode when left filled with saline solutions for long periods, electrodes should be made and filled immediately prior to use. Single-Barrel Standard Borosilicate Glass Tubing Order code Length OD (mm)
  3. Variety of Pre-pulled Micropipettes Available
    April 26, 2013
    Eliminate the cost and trouble of making your own micropipettes — WPI can quickly supply your need for consistently sized pre-pulled glass micropipettes for injection of dyes or proteins into cells, oocytes and for many other biomedical laboratory applications. Tip diameters (ID) range from 0.1 to 10 micrometers. Micropipettes are available as plain shank or with luer fittings. Schott Duran borosilicate glass 0.5 micrometer and smaller ID micropipettes include an internal glass fiber for easy filling Tip inner diameter tolerance ±20% Short taper yields high strength Nominal length ≈ 50 mm OD:ID = 1.33:1 Standard capillary outer diameters are 1.0 mm (thin-wall) or 1.14 mm Every pipette individually tested and inspected Vacuum packed
  4. Micropipette Holders and Half Cells
    April 25, 2013
    WPI’s microelectrode holder-half-cells couple fluid-filled glass micropipettes to high input impedance amplifiers. A Ag/AgCl pellet (or a silver wire) molded into the holder body provides stable potential. Electrical connection is made via male 2mm pins or female 2mm sockets. The pipette may be mounted axially or at right angles to the holder. Pipettes are held with screw-caps or rubber gaskets (without caps). Filling WPI microelectrode holders with electrolytes containing chloride results in stable electrode potential. Suitable electrolytes include KCl, NaCl andCaCl2. Holders are supplied for standard WPI single capillary tubing of 1.0, 1.2, 1.5 and 2.0mm outside diameters. (Call WPI regarding custom designs for other glass diameters.) The holder style you select will depend on your experimental application, space, and instrumentation. Hints for selecting and ordering micropipette holders Determine the required electrical connection on the holder. F
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