|Item Number||Cup No.||Seconds Range||Centistoke Range|
|13573||1||31 to 60||15 to 78|
|13575||2||19 to 60||39 to 238|
|13577||3||11 to 60||63 to 604|
|13579||4||10 to 60||97 to 899|
|13581||5||10 to 60||219 to 1627|
|Certificate of Calibration available at additional charge for all cups.|
|Cup No.||Efflux Time Seconds “T” from Centistokes “V”||Centistokes “V” from Efflux Time in seconds “T”|
|1||T = (V + √ (V2 + 6805) ) ÷ 3.18||V = 1.59T - 1070 ÷ T|
|2||T = (V + √ (V2 +12707) ) ÷ 8.36||V = 4.18T - 760 ÷ T|
|3||T = (V + √ (V2 + 23529) ) ÷ 20.46||V = 10.23T - 575 ÷ T|
|4||T = (V + √ (V2 + 32983) ) ÷ 30.26||V = 15.13T - 545 ÷ T|
|5||T = (V + √ (V2 + 58903) ) ÷ 54.54||V = 27.27T - 540 ÷ T|
|Note: Furnished with each cup is a conversion table for each tenth of a second within the cup range.|
|Catalog Number||Oil Number||Use With Cup Number||Nominal Centistokes* at 25°C., 77°F.|
|13653||G-350||4 and 5||880|
|*Certified value is printed on container label. Note: A graph is furnished with each cup showing efflux time of the "G" oil from 20 to 27 degrees Celsius.|
These standard oils prepared expressly by the Cannon Instrument Company for the Paul N. Gardner Company are produced in accordance with ISO/IEC 17025:2005, ISO/IEC Guide 34:2009, ISO 9001:2008.
Caution: Silicone fluids should not be used to calibrate viscosity cups. These materials change the interface between the cup surface and the test material and therefore change the cup calibration. The following is taken from ASTM D445: Viscometers used for silicone fluids should be reserved for the exclusive use of such fluids. Solvent washings from these viscometers should not be used for cleaning other viscometers.
Viscosity Cups are non-returnable items. Subject to final sale.
S90™ is a Registered Trade Mark of the Paul N. Gardner Company, Inc
Viscosity Cup Care
GARDCO produced and calibrated S90 Zahn viscosity cups are made of stainless steel except for the name plate. These cups will give years of satisfactory service requiring only thorough cleaning following each use. Even so, it is good practice to periodically confirm cup calibration. This is easily done with use of appropriate “G” oil listed in the Calibrating Oils table. Centistoke label value of the oil is traceable to the National Institute of Standards and Technology.
Guide for removing the G-series calibrating 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.
Equivalent Charts cover Gardco Calibrated Viscosity Cups and are based on conversion formulas of a type & with parameters as referenced in The Encyclopedia of Polymer Science & Engineering (Vol. 4, Second Edition, John Wiley & Sons, Inc.). Standard oils traceable to the National Institute of Standards & Technology were used in experimental development of these formulas.