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R
K and c are constants given in the following table:
Cup
a
Zahn Cup 1
a
Zahn Cup 2
a
Zahn Cup 3
a
Zahn Cup 4
a
Zahn Cup 5
a.
The constants are given in Patton, T. C., Paint Flow and Pigment Dispersion, second edition, John Wiley & Sons,
New York, 1979, page 82.
Please note:
•
The formula treats the cups as linear, which they are not.
•
The formula is effective for flow times between 20 seconds and 80 seconds
a.
Zahn Cup 1 - formula is effective between 35 seconds and 80 seconds.
6
K
c
1.1
29
3.5
14
11.7
7.5
14.8
5
23
0
Cup
Shell Cup 1
Shell Cup 2
Shell Cup 2½
Shell Cup 3
Shell Cup 3½
Shell Cup 4
Shell Cup 5
Shell Cup 6
a
.
K
c
0.226
13
0.576
5
0.925
3
1.51
2
2.17
1.5
3.45
1
6.5
1
16.2
0.5
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