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Glass Capillaries

  1. Buying Multi-Barrel Glass Capillaries
    April 30, 2013
    Two-barrel, 3-barrel, 5-barrel and 7-barrel glass capillaries are available at WPI. Multi-barrel configurations are designed especially for microiontophoresis. Because the capillaries are fused together during manufacturing, you will not need to twist them while pulling to seal the tips together. An inner filament in each barrel makes filling easy and fast. Multi-Barrel Borosilicate Glass Tubing with Filaments Order code Length
  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. Physical Properties of WPI Glass Capillaries
    April 25, 2013
    The physical properties of glass depend upon the chemical composition of the glass, as well as how the glass was manufactured. Glass has no set melting point, but four temperatures are of primary importance when discussing glass production. Working Point - This is temperature that the glass is soft enough to work. At this temperature, the glass viscosity is 104 poises. Softening Point - At this temperature, glass deforms easily, even by forces of gravity. The glass viscosity is 107.6 poises. Annealing Point - When glass reaches the annealing point and remains for a few minutes, many of the internal stresses of the glass formation are obviated. During the annealing process, the glass is heated to the annealing temperature and then allowed to cool at a controlled rate. Glass that is not annealed is prone to crack or shatter with minor temperature fluctuations or mechanical shocks. Strain Point - When glass temperature remains at the strain point for several hours, the internal stresses are relieved. Stresses that remain in the glass after maintaining the strain point for a few hours are permanent. WPI sells glass from multiple suppliers. In the tables below, we will detail some of the common glass specifications.   Duran® Schott 8250 Duran® Schott 8330 Corning 7800  Kimble N51A  WPI Usage Pulled Glass PG-52151, PG-52165 WPI thin wall glass capillariespre-pulled micropettes with  TW in the part number multi-barrel glass capillariesseptum thetapiggyback capillariesglass rods single barrel glass tubing (p/n 1Bxxxx) Density ρ   2.28g/cm3 2.23 ± 0.02g/cm3 2.33g/cm3 2.33g/cm3 Working Point - 104dPa·s 1055°C  1260 ± 20°C   1140°C Softening Point - 107.6dPa·s  720°C  820 ± 10°C 789°C  785°C Annealing Point - 1013 dPa·s  500°C  560 ± 10°C  565°C   570°C Strain Point 490°C  510°C 517°C   530°C Relative dielectric constant  tan δ at 1 MHz and 25 °C   4.6 10-437 10-4     Thermal expansion - 0-300°C 5.0x10-6/K 33x10-7 cm/cm/°C  55x10-7 cm/cm/°C  55x10-7 cm/cm/°C  Young's Modulus 64x103N/mm2 6.4x103Kg/mm2 7.2x103Kg/mm2  10.4x106PSI Poisson's Ratio 0.21 0.20      Dielectric Constant 4.9 4.6   5.8 Loss Factor 1MHz 25°C 22x10-4 2.6%    4.9%  Refractive Index 1.487 1.473mm²/N  1.490mm²/N  1.490mm²/N 
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