How to Use this Graph Example: You have an 800 centipoise fluid that you wish to pump at 150 mL/min. Find 150 mL/min on the "flow rate" axis of the graph above and find 800 centipoise on the "viscosity" axis. Follow the two points to where they meet. The graph shows that L/S® 35 and L/S® 36 tubing will produce the desired flow rate. These tubing sizes will also work for all lower viscosities and lower flow rates. Considerations: All viscosity test data was obtained using firm tubing materials such as Norprene®, PharMed®, Viton®, and Tygon® because these formulations perform the best in high viscosity applications. Tests were performed with fluids at 21°C (0°F) and 0 bar (0 psig) of back pressure. The graph is best used as a general guideline only, and is not a guarantee that you will achieve the results shown.