The G (Gardner) Series Viscosity Oils are certified viscosity reference standards used for the calibration Gardco Viscosity Cups, viscometers and rheometers. They facilitate accurate measuring for a variety of procedures associated with determining a fluid's resistance to flow. Long form certification available.
|EZ Cup No.||S90 / Zahn Cup No.||Mini Ford Dip Cup No.||Gardco / Fisher Dip Cup No.||Fisher Std Cup No.||Std. Ford & Std. Ford Dip Cup No.||Gardco/ISO & ISO Dip Cup mm||Gardco/Din & Din Dip Cup mm||Parlin Cup No.|
|G60||120||2||2||3, 4||3||3||3, 4||-||-||-|
|G350||880||5||4, 5||-||-||-||-||8 ²||-||-|
|¹ These are nominal values. For the actual centistoke value of the standard, refer to the value on the bottle label.|
² NOTE: The 8mm ISO Cup is not available in the Dip version
*Special temperature at 23°C
Efflux time to the nearest 0.1 second can be read from the conversation chart furnished with each Gardco produced cup, or a formula can be used as follows:
The information contained herein, or supplied by us or on our behalf in any other manner is based on data obtained by our own research and is considered accurate. However, NO WARRANTY IS EXPRESSED OR IMPLIED REGARDING THE ACCURACY OF THESE DATA, THE RESULTS TO BE OBTAINED FROM THE USE THEREOF, OR THAT ANY SUCH USE WILL NOT INFRINGE ANY PATENT. This information is furnished upon the condition that the person receiving it shall make his own tests to determine the suitability thereof for his particular purpose.
Manual Temperature Adjustment - For the technician who does not have automatic temperature control equipment, the following procedure may be useful with viscosity dip type cups: If the oil to be used is below temperature, place the bottle with the cap slightly loosened no closer than about one foot from an incandescent desk lamp. This will slowly raise the temperature of the oil. When within about one degree of measuring temperature, transfer the required amount of the oil to a glass container of sufficient height and diameter to accommodate the viscosity cup. (Glass is recommended due to its low rate of temperature conductance). Place the viscosity cup to be used in the oil in the glass container so that it comes to the same temperature as the oil and place a thermometer, preferably glass, in the oil which can also be used as a stirring rod. If necessary, to elevate the temperature slightly, simply hold the glass snugly in the hand while stirring the contents gently and observing the change in temperature. If necessary, to lower the temperature, dip the bottom of the glass container for a few seconds in water that is 10 to 20 degrees lower than measuring temperature and continue gentle stirring while the temperature slowly lowers. With a little practice it is possible to make measurements very close to the target temperature.
Guide for removing the calibrated oil from Gardco viscosity cups - Any remaining material in the cup must be removed by flushing with a suitable solvent. Light naphtha, heptane, octane, highly aromatic solvents, and or any other petroleum-derived hydrocarbon solvent can be used. Varsol® is a commercial solvent that works very well for this purpose. Varsol is a registered trademark of the Exxon Company. Completely dry the viscosity cup with a lint free cloth. Use a highly volatile solvent for a second cleaning as since any remaining hydrocarbon solvents from the first process will evaporate quickly after the sample has been flushed from the cup. Hypersolve, MEK and Alcohol can be used in aluminum cups and Hypersolve and Alcohol for the stainless steel cups. Acetone is commonly used as the second solvent because of its high volatility and its ability to dissolve traces of petroleum solvents and water. In the third process a low velocity stream of clean air will be sufficient to evaporate remaining traces of any volatile solvent. Be aware, avoid rapid evaporation of these solvents as this can cool the surface to such an extent that humid air may be brought below the dew point, causing a film of water to form on the cup.
Viscosity oils available from the Paul N. Gardner Company are NOT recommended for use with cups produced by other suppliers unless the conversion formula between centistoke viscosity and efflux time as well as cup production tolerance for the particular cup in question has been furnished.
A Material Safety Data Sheet is furnished with each bottle of "G" Series Standard Viscosity Oils. A certificate of analysis is included with all the certified oils. The Long Form Certificate has a Statement of Traceability that supplements the Certificate of Analysis that is already supplied with all the certified oils.