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How to compare viscosity measuring cups in seconds to centipoise
A cup second is not a centipoise. Convert efflux time to centistokes, then multiply by specific gravity. The original PDF is the chart. Call 800-249-0337.
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The original PDF is a viscosity conversion chart: cup seconds (Zahn, Ford, Shell, and related cups), Gardner bubble, Stormer/graphic, and Saybolt Seconds Universal (SSU) against centipoise. Use the PDF for the grid. This page is how to read it without mixing units.
What's in this guide
- What a cup actually measures
- Typical Zahn conversions (ASTM D4212)
Longer plant training (5–10 min)
Coming soon — downloadable deep-dive for the floor.
General plant guidance only — not a substitute for your process, SDS/TDS, or line trials. Call 800-249-0337 to match a grade.