Viscosity
Viscosity
- Indopol® polybutenes are available in a wide range of viscosities to meet the needs of many applications. If you are not sure which grade may be suitable for your application please e-mail our technical experts for advice at the address below. The variation of polybutene viscosity with temperature is shown in Figure 1.
- Figure 1 - The variation of polybutene with temperature
- To convert from centistokes (cSt) to centipoise (cP), multiply the viscosity in cSt by the density at the temperature under consideration: cP = cSt x density (kg/L)T
- To convert accurately from cSt to Saybolt Universal Seconds (SUS) is less straight forward. For viscosities of 100cSt and above at 100°C the relationship is: SUS = cSt x 4.653
- At other temperatures and lower viscosities, conversion charts should be used. Typical viscosities of Indopol® polybutenes in cSt at 40°C or 100°C are shown in Figure 1.
- A blending chart to enable estimation of the viscosity (in cSt) of a two component blend is available by contacting our technical experts.
- E-mail our technical experts for advice
- Typical number average molecular weights (Mn) and dispersion indexes (Mw/Mn) of Indopol polybutenes are shown in Table 1. These data were generated using a gel permeation chromatograph calibrated using polybutene standards.
- Typical densities at 15°C are shown in Table 1. Density increases with molecular weight, and decreases with temperature.
- The surface tensions of light polybutenes (up to Indopol L-50) are in the range 22-27dyne cm-1 at 20°C. Surface tension increases with viscosity.