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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

3-(Trimethoxysilyl)propyl-(2E,4E)-hexa-2,4-dienoate is a liquid at standard temperature and pressure, with a measured melting point of <-20°C, it undergoes decomposition without boiling from about 295°C. It has a measured density of 1.04 g/cm3 at 25°C, a measured kinematic viscosity of 6.4±0.3 mm2/s at 25°C and a predicted vapour pressure of 0.052 Pa at 25°C.

The substance is not classified for flammability according to Regulation (EC) No. 1272/2008, on the basis of a measured flash point of 146±2°C. Under the conditions of an EU Test Method A.12, the substance is not classified for flammability in contact with water. It has a measured auto-ignition temperature of 290°C at 749 -752 mmHg (99858.45 - 100258.42 Pa), and is not explosive and not oxidising on the basis of examination of the chemical structure.

In contact with water, 3-(trimethoxysilyl)propyl-(2E,4E)-hexa-2,4-dienoate reacts rapidly (half-life 4.7 hours at pH 7, 9.6 minutes at pH 5, 6 minutes at pH 9 and 25°C) to produce 3-(trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate and methanol according to the following equation:


It has a measured log Kow value of 3.09 at 30°C and measured water solubility value of 442 mg/l at 20°C.

Methanol is miscible with water, has low log Kow (-0.82 to -0.64) and high vapour pressure (12,790 Pa at 20°C) (OECD 2004).

The saturation concentration in water of the silanol hydrolysis product, 3-(trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate is limited by condensation reactions that can occur over time at loadings above approximately 1000 mg/l. However, it is very hydrophilic (calculated solubility is 1.0E+06 mg/l at 20°C using a QSAR method) and has a low log Kow (-0.3, predicted). It is less volatile than the parent substance (vapour pressure of <1.0E-03 Pa at 25°C, predicted).

Additional information