Registration Dossier
Registration Dossier
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EC number: 261-448-2 | CAS number: 58798-47-3
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The test substance is an aqueous solution in 40 % acetic acid. Basic Yellow 28 Acetate is only stable in presence of significant concentrations of free acetic acid; it can not be isolated as such.
The acetic acid solution has the more relevant vapour pressure with 20.79 hPa at 25 ˚C than Basic Yellow 28 acetate. The vapour pressure of Basic Yellow 28 methyl sulfate is 3.3E-7 hPa at 25 °C; hence only the acetic acid is inhalable as its vapour pressure is 20.79 hPa at 25 ˚C.
Key value for chemical safety assessment
- Vapour pressure:
- 0 hPa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of the methyl sulfate salt of Basic Yellow 28 is
| T (°C) |
p (hPa) | p (Pa) |
| 20 | 1.63 x 10-07 | 1.63 x 10-05 |
| 25 | 3.30 x 10-07 | 3.30 x 10-05 |
| 30 | 8.05 x 10-06 | 8.05 x 10-04 |
The vapour pressure of Basic Yellow 28 methyl sulfate is 3.3E-7 hPa at 25 °C; hence only the acetic acid is inhalable as its vapour pressure is 20.79 hPa at 25 °C.
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