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Physical & Chemical properties

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Appearance: Solid powder of white to light yellow colour with a faint chlorine odour.

Melting Point: 189°C (temperature of decomposition).

Boiling Point: 189°C (temperature of decomposition).

Relative density: 1.484 ± 0.04 at 20°C ± 0.1 °C.

Particle Size distribution (sieving method using woven wire cloth and perforated metal plate): Inhalable coarse and fine particles (< 10 µm) account for < 0.06 %.

Vapour pressure of CAS 127 -52 -6 "trihydrate”: 1536 Pa (20° ± 0.1) and 1976 Pa (25 ± 0.1°C). This indicates intermediate to high volatility from dry, non-adsorbing surfaces (≥ 5.2 x 10-3Pa). The vapour pressure of CAS 127-52-6 is 2.44 x 10-9Pa (0.00000000244). This indicates non volatility from dry, non-adsorbing surfaces (≤ 1.33 x 10-4Pa). The vapour pressure of 1536 Pa will not to be used for the chemical safety assessment since it is considered unlikely that CAS 127-52-6 co-evaporates with water from drying surfaces due to its high water solubility (see below).Instead the value of CAS 127 -52 -6, i.e. 0.000000002 Pa will be applied.

Partition coefficient n-octanol/water: log Pow = 0.14 ± 0.29 at pH = 7.0 and at a temperature of 26°C.

Water solubility of “127-52-6 trihydrate”: 221.2 g/L (20°C). This indicates that the substance is highly water soluble. The water solubility of CAS 127-52-6 is 292 g/L indicating that the substance is highly water soluble.

Solubility in organic solvents: Very sparingly soluble in ether and chloroform. Soluble in 20 parts ethanol yielding turbid solution.

Surface tension: 70 mN/m (20 ± 0.5 °C).

Flash-Point: Not determined. Substance is a solid.

Auto-Flammability: Not determined. Boiling point > 189°C (temperature of decomposition).

Flammability: Not highly flammable.

Explosivity: Non-explosive.

Oxidizing properties: Not oxidizing

Stability: Stable during 5 years at temperatures between 15°C and 25°C; stable during 14 days at 54°C; Stable during 6 months at 40°C, 1°C and -18°C.

Reactivity towards container materials (PE): Inert towards Polyethylene (PE).

PH of a 1% aqueous solution at 24.5°C: 10.3 ± 0.1

Dissociation: The substance does not dissociate protons based on its molecular structure. Hence an acetic dissociation constant cannot be provided. The pKa of CAS 80 -16 -0, i.e., N-chlorobenzenesulphonamide is 1.88 ± 0.4. CAS 80 -16 -0 is the molecule where the sodium atom of the CAS 127-52 -6 trihydrate has been replaced by a hydrogen atom. Dissociation of the sodium salt in water causes pH 10 of a 1% solution.