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.

Certification of the Rheological Behavior of SRM 2490, Polyisobutylene Dissolved in 2,6,10,14-Tetramethylpentadecane



Carl R. Schultesiz, C. Leighton


The certification of the rheological properties of standard reference material SRM 2490, a non-Newtonian fluid consisting of polyisobutylene dissolved in 2,6,10,14-tetramethylpentadecane, is described. The viscosity and the first normal stress difference were measured in steady shear at rates between 0.001 s-1 and 100 s-1 at 0 C, 25 C and 50 C. The linear viscoelastic storage modulus G' and loss modulus G'' were also measured in dynamic oscillatory measurements between 0.04 rad/s and 100 rad/s in the temperature range between 0 C and 50 C and master curves calculated using time temperature superposition.
Special Publication (NIST SP) - 260-143
Report Number


first normal stress difference, loss modulus, mastercurves, non-Newtonian, rheology, Standard Reference Material, storage modulus, time-temperature superposition, viscosity


Schultesiz, C. and Leighton, C. (2002), Certification of the Rheological Behavior of SRM 2490, Polyisobutylene Dissolved in 2,6,10,14-Tetramethylpentadecane, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed July 17, 2024)


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

Created February 1, 2002, Updated November 10, 2018