Viscosity measurement for trans-1,1,1,4,4,4-hexafluoro-2-butene (R1336mzz(E)) in liquid and vapor phases

•Viscosity measurement of R1336mzz(E) was performed by the method of tandem capillary tubes.•The liquid, vapor, and supercritical viscosities were measured over a wide range of temperatures and pressures.•The measurement uncertainties are estimated using the law of propagation by the GUM guideline.•Simplified correlations for the saturated liquid and vapor viscosities are developed by the extrapolation method.