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Thread: What the Heck is a Ford #6 and # 8 Viscosity Cup?

  1. #1
    Join Date
    Jan 2018
    Location
    Madison WI area
    Posts
    130

    What the Heck is a Ford #6 and # 8 Viscosity Cup?

    I am "testing" a waterborne Poly Topcoat and the TDS says "Viscosity using Ford Cup #6 40 +/- 5" I have googled a conversion chart for a ford #6 to #4 and found nothing. I cant even find a place to buy a number 6 cup lol.

    I did thin the product 10 percent and am able to spray beautifully with my 1.8 Fujispray, but i am just curious if there is a conversion chart?

    Thanks..
    Ridgid R4513 jobsite saw, Ridgid R4512 Table saw, Ridgid JP601 jointer/planer,
    Jet DC-1100VX-CK Dust collector, Bosch 1617 EVSPK router, Bosch RA1181 router table, Rikon 10-326 Band saw
    Dewalt 735 planer, Fuji Q5Platinum HVLP,

  2. #2
    I don't believe you'll find a perfect conversion chart as different sized cups work for different viscosity ranges. While there is some overlap between successive cup sizes, there isn't much. Moreso when skipping a size between cups. Having said that, searching for viscosity cup conversion chart turns up many hits that might be helpful to you.

  3. #3
    Join Date
    Jan 2007
    Location
    Michiana
    Posts
    1,267
    I've always used Zahn cups. But this will tell you all you want to know about Ford cups: https://en.wikipedia.org/wiki/Ford_viscosity_cup
    It's wood dust. Saw dust would suggest a problem.

  4. #4
    Join Date
    Jan 2018
    Location
    Madison WI area
    Posts
    130
    Thanks... That clears things up :-)
    Ridgid R4513 jobsite saw, Ridgid R4512 Table saw, Ridgid JP601 jointer/planer,
    Jet DC-1100VX-CK Dust collector, Bosch 1617 EVSPK router, Bosch RA1181 router table, Rikon 10-326 Band saw
    Dewalt 735 planer, Fuji Q5Platinum HVLP,

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