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Description of key information

Key value for chemical safety assessment

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

Additional information

Dynamic viscosities of 1,1’-DPE at various temperatures are given in a handbook of the American Petroleum Institute:


Temperature (°C)     Viscosity (cp)

      0.0                           8.983

    20.0                           4.484

    37.8                           2.844

    60.0                           1.340

    98.9                           1.075


The conversion between dynamic and kinematic viscosity is described as follows:

dynamic viscosity (mPa*s) = kinematic viscosity (mm2/s) x density (g/cm3)


For 1,1’-DPE the kinematic viscosity at 37.8 °C is 2.845 mm2/s.

A substance is classified in Category 1:

(a) based on reliable and good quality human evidence


(b) if it is a hydrocarbon and has a kinematic viscosity of 20.5 mm2/s or less, measured at 40 °C .

According to these criteria 1,1’-DPE has to be classified into Category 1 for aspiration hazard. No further testing is required.