Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A Nonlinear Fluid Standard Reference Material: Progress Report



Carl R. Schultesiz, G B. McKenna


NIST is in the process of developing a new Standard Reference Material that replaces the previous SRM 1490 Nonlinear Fluid Standard. The purpose of the material and its development is two-fold: first, to help equipment manufacturers and researchers in different laboratories to better understand the inherent lab-to-lab variability in their measurements and consequently help reduce these; and second, to provide a standard fluid that is useful to researchers and analytical laboratories alike as a research material and as a secondary standard because it is homogeneous and has well known material properties. The material property ranges of interest will be decided through consultation with the Rheology community; this process is already underway and has led to a preliminary selection of a solution of polyisobutylene dissolved in 2,2,4,4,6,8,8-heptamethylnonane. NIST is performing the initial measurements on this material and is organizing a round robin to ensure that the chosen material properties are acceptable to those participating in the round robin and to bring a consensus concerning the lab-to-lab variability in the measurements. Based on these results, the fluid will be certified for the shear rate dependence of viscosity and first normal stress difference over a temperature range of approximately 50[degrees] C. The linear viscoelastic responses will also be certified along with the temperature dependence of the shift factors and the zero-shear-rate viscosity. Here we present progress up to the current time.
Proceedings Title
ANTEC (Annual Technical Conference) of the Society of Plastics Engineers
Conference Dates
April 26-30, 1998
Conference Location
New York, NY
Conference Title
ANTEC Conference Proceedings


non-Newtonian fluid, normal stresses, polyisobutylene, rheology, Standard Reference Material, viscosity


Schultesiz, C. and McKenna, G. (1998), A Nonlinear Fluid Standard Reference Material: Progress Report, ANTEC (Annual Technical Conference) of the Society of Plastics Engineers, New York, NY, [online], (Accessed July 18, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created April 30, 1998, Updated October 12, 2021