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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Octanal is a clear colourless to pale yellow liquid.

The freezing point of the test substance (Aldehyde C8) was determined to be < -20ºC.

The boiling point of the test substance (Aldehyde C8) was determined using a Differential scanning calorimetry (DSC) according to OECD 103 method and it was determined to be 175ºC.

The specific gravity at 25 °C was 0.819 (0.816-0.821). The density at 20 °C was 0.8197 g/mL (range 0.818 -0.833 g/mL).

The vapour pressure of octanal was determined to be 148.29 Pa at 298K (25 °C).

The partition coefficient n-octanol/water of aldehyde C 8 octylic was determined by reverse phase HPLC and the result obtained was log Pow = 3.5 (at ambient temperature).

Octanal was only partially miscible (0.1 mass %) 1000mg/L over the temperature range from 0 to 90°C.

The surface tension of octanal is predicted to be 0.0279 N/m at 20 degC.

The flashpoint of the test substance (Aldehyde C8) was determined to be 54ºC. A liquid with flashpoint of not more than 60 °C is a flammable liquid. Octanal has a flashpoint of 54 °C and therefore it is classified as flammable Cat. 3 according to Regulation (EC) 1272/2008 [the CLP Regulation].

Two results were quoted in DIPPR (accessed via Knovel Database): 469 K, 470 K, giving an average auto flammability of 469.5 K (196 °C).

Explosive properties are associated with the presence of certain chemical groups in a molecule which can react to produce very rapid increases in temperature or pressure. When there are no chemical groups associated with explosive properties present in the molecule then a substance or mixture shall not be classified as explosive. In this case, the substance does not contain any chemical groups associated with explosive properties.

Examination of the chemical structure of the substance confirms that only carbon, hydrogen and oxygen atoms are present. The oxygen atom is not part of a characteristic structural group of concern for oxidising properties, and nitrogen is absent from the structure. It can be predicted that the substance does not possess oxidising properties, or contribute to the combustion of other materials. It is therefore concluded that octanal is unlikely to be an oxidising substance.

Viscosity of octanal was reported to be 1.26 mPa s at ca. 20°C.

The following endpoints were waived: granulometry, stability in organic solvents and dissociation constant.