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Fluid Handling/Dispensers Q&A

  •   Why would I use a PTFE-coated dispensing tip instead of a general-purpose tip?

    Answered October 29th, 2009 by Expert: Tom Muccino

    PTFE-coated tips are primarily used for fluids that have a higher surface tension and tend to wick up the outer diameter of the cannula of a standard general-purpose tip. When trying to make a small deposit, if part of that deposit wicks up the outer diameter of the cannula, then the result will be an inconsistent deposit. After a few dispenses, the build-up of the fluid that has collected on the outer diameter of the cannula will fall off, creating a larger deposit on the part. The PTFE coating lowers the surface tension of the cannula, so that the fluid being dispensed will not wick up the tip, resulting in very consistent dispenses.

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