Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

The substance 7a-ethyldihydro-1H,3H,5H-oxazolo[3,4 -c]oxazole (98.55% w/w) is a colourless liquid at room temperature with a slight amine smell.

It has the following physical and chemical properties:

  • freezing point of 1°C
  • boiling point (at atmospheric pressure) of 187.0°C ± 2.5°C.
  • relative density of 1.08 at 20°C
  • vapour pressure of 60.6Pa at 25°C ± 0.5°C and 37.6Pa at 20°C ± 0.5°C
  • miscibility in water in all proportions at ambient temperature, 10°C and 30°C and in all proportions in pH5 and 9 buffers.
  • octanol-water partition coefficient (Log P) at 25°C as follows: in distilled deionised water: Log P = -0.32, in pH 5: Log P = -1.1, and in pH 9: Log P = -0.31 
  • surface tension of 71.4 +/- 0.6mNm-1at 25°C
  • a high flash point of 79°C, no pyrophoric properties and no evolvement of gas when in contact with water (not flammable)
  • no auto-ignition or auto-flammability properties
  • no characteristics of being an explosive or an oxidizing agent.
  • pH of 10.0 at 22°C
  • dissociation constant of 4.0 at ambient temperatire
  • viscosity of 5.2 mPa.s at 20 °C and 3.1mPas at 40°C