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VISCOSITY
GARDCO EZ™ VISCOSITY CUPS
EFFLUX TIME IN SECONDS — TEMPERATURE
49
48
S
E
47
C
46
O
N
45
D
S
44
43
20
Gardco produced viscosity cups are calibrated with standard "G" Series oils. Centistoke viscosity of
these oils is traceable to the National Institute of Standards and Technology. These oils are
available from the Paul N. Gardner company.
Shown in the above graph is the viscosity cup number and the standard "G" oil used for its calibration.
Normally, cup calibration is at 25 degrees Celsius, shown on the graph by bold lines intersecting
with the curve in the circle. Graphs for other numbered cups in the series are on following pages.
Viscosity of most liquids, including the standard oils, are dependent on temperature. Efflux time in
seconds for the indicated cup-oil combination from twenty (20) to twenty seven (27) degrees Celsius
is shown in the above graph. The cup may be checked with the indicated "G" oil with reasonable
accuracy within these limits. For best accuracy, the standard oil label viscosity with temperature at
25 degrees Celsius should be used. Conversion from viscosity to efflux time in seconds is by the
formula or table furnished with the cup. Conversion between degrees Celsius and Fahrenheit is on
the reverse side of this page.
This information is included with each viscosity cup sold by the Paul N. Gardner company or by
authorized distributors.
30
45.22 SECONDS
17.60 CENTISTOKES
21
22
Paul N. Gardner • www.gardco.com • (954) 946-9454
GARDCO EZ™ CUP #1
G-10 STANDARD OIL
25 DEGREES
23
24
DEGREES CELSIUS
25
26
27
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