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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

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.