Registration Dossier
Registration Dossier
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EC number: 201-058-1 | CAS number: 77-78-1
Flammability
Administrative data
Link to relevant study record(s)
Description of key information
Highly flammable: No (waiving)
Pyrophoric substance (A13): No (waiving)
Highly flammable solid (A10): No (waiving)
Highly flammable liquid (A9): No (see flash point 4.11)
Highly flammable gas (A11): No (waiving see discussion)
In contact with water substance liberates highly flammable gases (A12): No (waiving see discussion)
Flammable (A9): No
Key value for chemical safety assessment
- Flammability:
- non flammable
Additional information
Flammability, solid:
A test according to A.10 (flammability; solid) is not considered to be required, since the substance dimethyl sulfate is a liquid substance with a melting point of a range from -27 °C to -32°C and a boiling point of 188 °C, and therefore not a solid at room temperature (cf. Annex VII section 7.10 Column 2 of regulation (EC) 1907/2006).
Flammability, gases:
A test according to A.11 (flammability; gases) is not considered to be required, since the substance dimethyl sulfate is a liquid substance with a melting point of a range from -27 °C to -32°C and a boiling point of 188°C, and therefore not a gas at room temperature (c.f. Annex VII section 7.10 Column 2 of regulation (EC) 1907/2006).
Flammability in contact with water:
DMS hydrolyses very fast in water (DT50 <1d) to monomethyl sulfate and methanol whereas methanol is known to be highly flammable (H225; flash point of 11°C (IUCLID 4 dataset 2000)), the development of highly flammable gases of methanol (≥ 1L/kg per h) is impossible due to the high solubility of methanol in water and the resulting low “Henry`s law constant” of 0.41 Pa m3/mol. Therefore, DMS could be regarded as not flammable in contact with water and must not be classified as such. Furthermore, experience in handling shows that the substance does not ignite in contact with water.
Pyrophoric properties:
It is stated by the manufacture and confirmed by the costumers of the product that the substance DMS is a transported isolated intermediate which is only produced and used in strictly closed containers/apparatus in the manner described in Article 18(4) a-f of the regulation (EC) 1907/2006. Therefore, testing of pyrophoric properties (EC A.13) is not necessary (c.f Annex XI section 3.2 (b)). For confirmation of Article 18 (4) a-f please refer to section 13 of this technical dossier.
It is assumed that DMS hydrolyses under reaction with the humidity in air to monomethyl sulfate and methanol. Methanol is known to be highly flammable (H225; flash point of 11°C) with a self-ignition temperature of approx. 385 °C and a lower explosive limit of approx. 5.5 Vol % (IUCLID 4 dataset 2000). Methanol is highly soluble in water (106 mg/L at approx. 20°C) and low volatile (“Henry`s law constant” of 0.41 Pa m3/mol), hence, DMS could be regarded as not flammable in contact with air and must not be classified as such.
Justification for classification or non-classification
According to regulation (EC) 1272/2008 DMS should not be classified as flammable.
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.
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