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Physical & Chemical properties

Viscosity

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Description of key information

The analogue TFA is considered as a Newtonian liquid. Its viscosity is close to water.

Key value for chemical safety assessment

Viscosity:
1.8 mPa · s (dynamic)
at the temperature of:
20 °C

Additional information

No data is available on the anhydride TFAH, but a fully reliable study was conducted on the corresponding acid TFA, which is expected to have the same magnitude of order.

The viscosity of the test substance TFA was measured according to recognised methods, and under GLP, using a rotary viscometer. At a shear rate varying from 20 to 100 s-1, the viscosity did not vary significantly: 0.9 to 9.0 mPa s at 20°C. At a constant shear rate of 2000 s-1, the viscosity was measured to be 1.8 mPa s at 20°C, and 1.6 mPa s at 40°C. Although these results are below the standard working range of the rotary viscometer (estimated accuracy in this low viscosity range was checked to be ca 14%), the test item can be considered as a low viscous liquid.