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Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

Sodium vinylsulphante is exlusivly used as a 25 - 35% aqueous solution.
The melting point of the solution is ≤ -20°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-20 °C

Additional information

Sodium vinylsulphonate tends to polymerize at elevated temperatures. In several patents methods to isolate the dry substance are reported. Due to the practically pure results the solid form of Sodium vinylsulphonate is commercially not available.

Based on (Q)SAR calculations the melting point of pure Sodium vinylsulphonate is 193.71°C. In a patent (see endpoint study record melting point / freezing point.005) a melting of 135 -140°C is reported. As this information can not be regarded as reliable and no other results for the dry substance are available, it is concluded that Sodium vinylsulphonate polymerizes before melting.

The melting point of the solution of 25 - 35 % Sodium vinylsulphonate in water is -20°C or below.