Registration Dossier
Registration Dossier
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EC number: 225-969-9 | CAS number: 5188-07-8
Endpoint summary
Administrative data
Description of key information
Additional information
Different grades of sodium methanethiolate aqueous at 21%, at 33% and at 54% in aqueous solution are commercialized.
The commercialized grades of sodium methanethiolate are made by reaction of sodium hydroxide in solution and methylmercaptan.The water free from of Sodium methanethiolate is technically very difficult to obtain as the reaction of sodium hydroxide and methylmercaptan creates water. The form registered in this dossier is the sodium methanethiolate solid that can be obtained without adding any water during the process:
CH3SH + NaOH--> CH3SNa + H2O
The SMM solid was made in one of registrant's facilities. The composition of the product was :
CH3SNa: 73%, H2O: 19%
NaOH: 7%
MeOH: 1%
xylene (solvent)<2%
This solid form of sodium methanethiolate is neither produced nor commercialized by the regsitrant thus only study reports on the commercialized grade of the substance are available.
| Physical state | Melting point | Decomposition point | Density | Vapour pressure | Flash point | Auto flammability | |
| CH3SNa,H2O 91% | Solid | ||||||
| CH3SNa 54% in water | Liquid | 39°C | 216°C | 87°C (NaOH content 2.2%) | >350°C | ||
| CH3SNa 33% in water | Liquid | -14°C | 50,85°C | ||||
| CH3SNa 21%in water | Liquid | -12°C | 71,85°C | 1,12 | 2900 Pa | 30°C (NaOH content 0.6%) | >400°C |
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