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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Administrative data

Description of key information

Additional information

The physical and chemical properties of substance diacetoxydi-tert-butoxysilane are:

Appearance/physical state/colour


Freezing point

<-35.2 ºC (EU Method A.2)

Boiling point

210.2 ºC at 102.1 kPa (EU Method A.2)

Relative density

1.037 at 20 ºC (EU Method A.3)

Particle size distribution

Not applicable (liquid)

Vapour pressure

2.88 Pa at 20 ºC (EU Method A.4)

Partition coefficient

1.41 (EPI-Suite)

Water solubility

Not applicable (hydrolytically unstable)

Surface tension

24.2 mN/m at 20 ºC (EU Method A.5)

Flash point

99 ºC at 100.5 kPa (EU Method A.9)

Auto flammability

475 ºC at 990 -1010 hPa (EU Method A.15)


Non flammable (based on experience)


Non explosive (based on structure)

Oxidising properties

Non oxidising (based on structure)

Stability in organic solvents

Not applicable (not critical)


3.02 at 20 ºC (CIPAC MT 75.3)

Dissociation constant

Not applicable (hydrolytically unstable)


7.8845 mm2/s at 20 ºC (OECD 114)