TS 9353

TS 9353 is a viscosity-units standard that provides the equations and tables used to convert between Saybolt Universal and Saybolt Furol viscosity and kinematic viscosity. Because petroleum and similar fluids have long been reported in more than one viscosity scale, these conversion rules help users compare results on a common basis.

How the viscosity scales relate

Kinematic viscosity describes a fluid’s resistance to flow under gravity and is commonly expressed in centistokes. Saybolt values are practical viscosity expressions based on efflux time; Saybolt Universal is used across a wider range, while Saybolt Furol is generally associated with more viscous fluids. The value of this standard is that it provides a consistent conversion framework between those different ways of expressing the same property.

What the standard covers technically

• Equations for converting Saybolt Universal viscosity to kinematic viscosity and back again
• Equations for converting Saybolt Furol viscosity to kinematic viscosity and back again
• Conversion tables used in the process
• A same-temperature conversion approach for comparable results

Rather than defining the viscometer itself or a full test procedure, the document focuses on converting numerical results from one viscosity system to another. That makes it useful in laboratories, refinery practice, and technical evaluation of petroleum products where different reporting formats must be reconciled.