Registration Dossier
Registration Dossier
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EC number: 219-637-2 | CAS number: 2487-90-3
Flammability
Administrative data
Link to relevant study record(s)
- Endpoint:
- flammable liquids: obsolete as covered by section 'Flash point'
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- the study does not need to be conducted because the substance is a liquid
- Endpoint:
- substances / mixtures which in contact with water emit flammable gases
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Endpoint:
- pyrophoric liquids
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied
Referenceopen allclose all
Description of key information
The substance, trimethoxysilane:
• Is highly flammable (based on a measured flash point of 7°C and boiling point 84.4°C)
• In contact with water emits a flammable gas
• Is not pyrophoric
Key value for chemical safety assessment
- Flammability:
- flammable
Additional information
The flammability of liquids is assessed on the basis of flash point.
There is no indication on the basis of chemical structure and experience in handling and use that the substance is pyrophoric (flammable in contact with air).
The substance hydrolyses rapidly in contact with water to form silanetriol and methanol. The Si-H bond in silanetriol also undergoes further hydrolysis to form silicic acid and hydrogen. The registered substance is therefore classified as Category 3, H261 substances in contact with water emit flammable gases.
Therefore, in accordance with Section 1 of REACH Annex XI, there is no need to conduct further flammability testing.
Lower and upper flammability limits in air of 1.5% and 42% respectively were determined for the substance using a relevant test method.
Justification for classification or non-classification
Flammability:
The substance is classified as a Flammable Liquid Category 2 (H225: Highly flammable liquid and vapour) on the basis of Regulation (EC) No. 1272/2008. This is because the substance has a flash point of 7°C and boiling point of 84.4°C.
Flammability in contact with water:
The substance is classified as a Category 3 (H261: In contact with water releases flammable gases) on the basis of Regulation (EC) No. 1272/2008.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
