BYK-Gardner Viscosity Cupsįor more information on BYK-Gardner Viscosity Cups, click here. To order your Viscosity Cup Conversion Chart, click here. Tracy Hill is a Technical Writer with BYK-Gardner USA, Columbia, MD. Viscosity in centistokes × Specific Gravity = Viscosity in centipoise The equations listed in this chart along with their constants K and C can be used to convert the time of flow (T) in seconds to Kinematic Viscosity (V) in centistokes. Checking Procedures and Calibration of Viscosity CupsĬonsult the standard method listed for your cup to determine the procedures for checking and calibrating the cup. Other instruments for measuring viscosity in the laboratory that have improved precision and repeatability include the Brookfield Viscometer and the Cone & Plate Viscometer. Certified Viscosity Cupsįor a cup guaranteed to meet its specifications, consider using a certified cup. Precautions should be taken whenever thixotropic or other non-Newtonian liquids are tested for viscosity, because there is no definite rate of shear generated in a flow cup. The temperature of the draining liquid should be controlled and measured in the efflux stream only after it passes through the drainage hole. Viscosity cup free#The diameter of the orifice should be selected and maintained so as to provide flow times falling within prescribed minimum and maximum limits. AFNOR Cup 4is equal to AFNOR Cup 4Seconds and cP Free Viscosity Control Buyer’s Guide Get insight and information on the latest in viscosity control technology. No matter which type of cup is used there are several fundamental considerations that should be recognized: Most of these cups are of two main types – mounted on a stand for filling and draining, or dipped directly into the liquid container before draining back into the same container. If you’re using a Fuji Spray system for spray finishing, give us a call at 1-80 or email us at with any questions you may have regarding viscosity measurement.At least fifty types of flow cups have been developed and used over the years, mainly for production control and field inspection purposes. Viscosity cup install#By referencing this index, you will be able to confidently choose the needle and nozzle size best suited for spraying your finish.Ī basic understanding of viscosity will help any spray finisher improve the quality of their work while removing the hassle and uncertainty of choosing which needle and nozzle size to install on their spray gun. Viscosity cup manual#Most manufacturers of spray finishing equipment will include a viscosity index in their manual for you to compare your run-out time with the recommended run-out time as per the coating or equipment manufacturer. The amount of time elapsed is called your run-out time. Once the cup drains completely or you notice a break in the stream, stop your timer. Start your timer the moment you begin lifting the cup out of your finish. Viscosity is measured by submerging your viscosity cup into your finish then removing it to see the amount of time your finish takes to pass through the orifice at the bottom of the cup. The most common viscosity cup sizes are the #4 Ford or the #2 Zahn. You will require (a) your desired finish, (b) a Viscosity Cup and (c) a stopwatch. Typically, it is measured in centipoise which is one hundredth of a poise. Viscosity is the measurement of a fluid’s resistance to flow. To save you from dusting off your high school chemistry book, we have listed some information below about viscosity in relation to spray finishing: By recording these measurements, you can duplicate your material “recipe” for future projects to ensure consistency in production. When spray finishing, viscosity measurements will help you understand the size of needle and nozzle required to effectively atomize your finish. V is for Viscosity – Understanding Viscosity V is for Viscosity – Why understanding viscosity is important to spray finishing:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |