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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties


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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.