Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

4.1 Appearance/physical state/colour

Guanidine hydrochloride is a solid, white, odourless organic substance.

4.2 Melting point/freezing point

The melting point of Guanidine hydrochloride is 188 °C

4.3 Boiling point

Decomposition of Guanidine hydrochloride above 231 °C

4.4 Density

The density of guaninie hydrochloride is reported to be 1.345 g/cm3

4.5 Particle size distribution (Granulometry)

Particle size distribution of Guanidine hydrochloride has a 50percentil of 139micrometer.

4.6 Vapour pressure


4.7 Partition coefficient

Guanidine hydrochloride showed a log Kow < -1.70

4.8 Water solubility

The solubility of guanidinium chloride in water is reported to be 2150 g/l at 20 °C

4.9 Solubility in organic solvents / fat solubility

no study available

4.10 Surface tension


4.11 Flash point


4.12 Auto flammability

Guanidine hydrochloride shows no self ignition at heating up to the melting point (183 °C)

4.13 Flammability

Guanidine hydrochloride does not burn when in contact with a heated platinum wire

4.14 Explosiveness


4.15 Oxidising properties


4.16 Oxidation reduction potential

no study available

4.17 Stability in organic solvents and identity of relevant degradation products


4.18 Storage stability and reactivity towards container material

no study available

4.19 Stability: thermal, sunlight, metals

no study available

4.20 pH

no study available

4.21 Dissociation constant

Salt of a strong acid with a strong basic.

4.22 Viscosity


4.23 Additional physico-chemical information

no study available


Additional information