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VISCOSITY
The EZ™ Viscosity Cup Series is a logical and necessary outgrowth of the standardization
studies on the Zahn Signature and similar cups for the promotion of this most popular type of
viscosity measuring instrument as a national and international standard. Not only has this
cup been improved with respect to earlier produced cups and designed to comply to the
requirements of ASTM D4212 but, in addition, each EZ™ Cup is furnished with a table
which permits conversion between efflux time in seconds to the nearest tenth of a second
to viscosity in centistokes. This table is particularly useful in determining efflux time in
seconds when viscosity in centistokes is known.
For those users who require documented certification of their measuring equipment, the
EZ™ cups may be ordered, at an additional charge, with a CERTIFICATE of CALIBRATION.
This document contains not only information on actual cup calibration with standard
oils traceable to the National Institute of Standards and Technology but in addition, this
certification also complies to conditions and procedures under the requirements of ANSI/
NCSL Z540 or ISO/IEC 17025.
The EZ™ cups are produced to very close mechanical tolerance in elaborate jigs and
fixtures. Such equipment not only ensures that each cup is correctly produced but also that
all cups are identical. All parts of the cup are of stainless steel except for the name plate.
The following table provides operating range specifications, cup midrange sensitivity and
recommended calibrating oils. Following this table are graphs and mathematical formulas
that relate efflux time in seconds to centistoke viscosity.
Cup
Number
1
2
3
4
5
(*) CENTISTOKE VALUES ARE NOMINAL - ACTUAL VALUES PRINTED ON LABELS
(**) STATED AS CENTISTOKES PER SECOND OF EFFLUX TIME
2
SPECIFICATION TABLE
Seconds
Centistoke
Range
40 TO 60
10 TO
20 TO 60
19 TO 156
12 TO 60
64 TO 596
10 TO 60
79 TO 784
10 TO 60
161 TO 1401
Paul N. Gardner • www.gardco.com • (954) 946-9454
Midrange
Range
Sensitivity
36
TECHNICAL INFORMATION
The POISE is the fundamental unit of viscosity.
It is a defi ned mechanical measurement of the
resistance of a liquid to fl ow where gravity is
not a factor. 100 CENTIPOISE = 1 POISE.
However, gravity is the driving force causing
liquid in a viscosity cup to fl ow through the
orifi ce. A high density material will fl ow from
a cup in a shorter time than a low density
material of the same viscosity.
Calibration
Oil Number/
(**)
Centistokes (*)
1.3
G-10/19
3.3
G-60/117
10.5
G-200/458
13.9
G-200/458
24.2
G-350/878
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