That is,Ĭentipoise = centistokes x specific gravityīut as previously explained to Aniruddha, you're using the wrong cup. It includes a chart by Euverard showing a conversion factor of 3.7 for the Ford #4 cup. On Amazon] as it has an excellent chapter on the subject of viscosity and its measurement with the various cups and devices. Please also try to also get hold of the ASTM Gardner/Sward "Paint Testing Manual" [affil. Method ASTM D1200 covers viscosity measurement with the Ford Cup. ( may earn commission) September 1, 2009Ī. Please send us how to convert it in to centipoise. We are checking its time to empty the cup in seconds. note: Although you can buy "certified" Ford #4 cups I'm not sure that that quite answers Sushil's question. I think it has wide range of useful information.
Try - Viscosity conversion tables by Norcross Corporation. Can you correlate these parameters to the disagreement of the cups? How do I say that a particular #4 cup is faulty and should be discarded? Can anyone explain to me the reasons? I can verify the volume of cup and the dia of orifice. I find that Two cups - #4 cups never give the same results. According to the previously referenced chart at it looks like the efflux time for an F5 cup would be about 48 seconds. The viscosity which you are trying to measure is beyond the workable range of an F4 cup. Using a cup with a huge hole to measure the viscosity of thin liquids that will drain in a flash would be like timing a 100 meter sprint with a sun dial and using a cup with a tiny hole to measure the viscosity of very thick fluids would be like using a stop watch to time the lifespan of an elephant :-) Meghan's posting was from 3 years ago so he might not be around to answer.īut I think the basic issue is that there are practical limits to such rough conversions.
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