VISCOSITY
21
T = ( V + V
2
+ 8366) ÷ 5.60
EZ
™
ZAHN (ASTM) DIP CUPS
CUP #2
CONVERSION FORMULAS AND TABLE
©
EZ
™
viscosity cups are designed to comply with requirements of ASTM
D4212 and to take advantage of design changes known to provide best
possible results. Cup
dimensions are carefully controlled and cup
calibration conditions comply with ANSI/NCSL Z540 or ISO/IEC 17025.
Standard viscous oils traceable to the National Institute of Standards and
Technology are used in calibration procedures to insure specifi
ed
effl
ux time
tolerance.
Use this formula derived by Paul N. Gardner
c c
ompany research to
find
viscosity (V) in centistokes when cup effl ux time in seconds (T) is known:
V = 2.80T – 747 ÷ T
Use this formula to fi nd cup effl ux time in seconds (T) when viscosity (V)
in centistokes is known:
Results from the above formulas, solved for each tenth of a second within
the cup range, are shown on the reverse side of this page. To find
centistoke viscosity for a given cup efflux time in seconds, read down the
column on the left to fi nd the nearest second. Then, read to the right to
the nearest tenth of a second column to find centistoke value. The chart
may be read in reverse to find efflux time seconds when viscosity is
known.
The EZ
™
series of five viscosity cups are produced, calibrated and sold
only by the Paul N. Gardner
c
ompany and authorized distributors.
©
Copyright 1987, Paul N. Gardner Company
Paul N. Gardner • www.gardco.com • (954) 946-9454
