ASTM D4212, ASTM D1200
CANNON flow cup viscosity standards are for use in Zahn, Shell and Ford flow cups. Lot specific kinematic viscosity data in mm²/s (cSt) and calculated cup drain times are provided with each standard. Nominal values at 25 °C are shown in the associated table. Data is also provided at 20 °C and 23 °C.
Standard Size: 5 gal
Viscosity Standard: C200
Viscosity Values
Nominal viscosity values of flow cup viscosity standards at 25 °C
| Catalog Number | Viscosity Standard | Kinematic viscosity mm2/s (cSt) | Zahn Cup | Shell Cup | Ford Cup | |||
|---|---|---|---|---|---|---|---|---|
| Size | Drain time (sec) | Size | Drain time (sec) | Size | Drain time (sec) | |||
| 9727-W10 | C6† | 8.9 | — — |
— — |
1 2 |
52 20 |
— | — |
| 9727-W12 | C10† | 17 | 1 — |
45 — |
2 2½ |
35 22 |
1 — |
70 — |
| 9727-W15 | C20† | 34 | 1 2 — |
60 24 — |
2 2½ 3 |
64 40 24 |
2 — — |
42 — — |
| 9727-W20 | C35† | 66 | 2 — — |
33 — — |
2½ 3 3½ |
74 46 32 |
2 3 — |
64 35 — |
| 9727-W25 | C60† | 120 | 2 — |
48 — |
3½ 4 |
57 36 |
3 4 |
58 36 |
| 9727-W30 | C100† | 230 | 3 4 |
27 21 |
4 5 |
68 36 |
4 — |
64 — |
| 9727-W35 | C200† | 420 | 3 4 |
43 32 |
5 6 |
64 26 |
5 — |
36 — |
| 9727-W40 | C350 | 710 | 4 5 |
53 31 |
6 — |
44 — |
5 — |
60 — |
| 9727-W45 | C600 | 1200 | 5 | 54 | — | — | — | — |
† Data is also provided for ISO cups
Flow Cup Equations
These equations convert cup drain time, collected at 25 °C and between the minimum and maximum drain times indicated, into kinematic viscosity values in mm²/s (cSt). For more information on cups, contact Technical Service.
Equations and ranges of viscosity flow cups at 25 °C
| Cup number | Equations† where t=flow time in seconds n=kinematic viscosity in mm2/s |
Drain time (sec) | Approximate kinematic viscosity (cSt) | ||
|---|---|---|---|---|---|
| min | max | min | max | ||
| Zahn Cup (see ASTM D4212) | |||||
| 1 | n = 1.1 (t−29) | 35 | 80 | 5 | 60 |
| 2 | n = 3.5 (t−14) | 20 | 80 | 20 | 250 |
| 3 | n = 11.7 (t−7.5) | 20 | 80 | 100 | 800 |
| 4 | n = 14.8 (t−5) | 20 | 80 | 200 | 1200 |
| 5 | n = 23t | 20 | 80 | 400 | 1800 |
| Shell Cup (see ASTM D4212) | |||||
| 1 | n = 0.226 (t−13) | 20 | 80 | 2 | 20 |
| 2 | n = 0.576 (t−5) | 20 | 80 | 10 | 50 |
| 2½ | n = 0.925 (t−3) | 20 | 80 | 20 | 80 |
| 3 | n = 1.51 (t−2) | 20 | 80 | 30 | 120 |
| 3½ | n = 2.17 (t−1.5) | 20 | 80 | 40 | 170 |
| 4 | n = 3.45 (t−1) | 20 | 80 | 70 | 270 |
| 5 | n = 6.5 (t−1) | 20 | 80 | 125 | 520 |
| 6 | n = 16.2 (t−0.5) | 20 | 80 | 320 | 1300 |
| Ford Cup (see ASTM D1200) | |||||
| 1 | n = 0.49 (t−35.0) | 55 | 100 | 10 | 35 |
| 2 | n = 1.44 (t−18.0) | 40 | 100 | 25 | 120 |
| 3 | n = 2.31 (t−6.58) | 20 | 100 | 49 | 220 |
| 4 | n = 3.85 (t−4.49) | 20 | 100 | 70 | 370 |
| 5 | n = 12.1 (t−2.00) | 20 | 100 | 200 | 1200 |
† While the above equations are widely used, n = at − b/t is often more applicable at short flow times and low KV
