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Physical & Chemical properties

Vapour pressure

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Description of key information

Liquid: The substance is a 25% solution in water, therefore performing a study is scientifically unjustified since the vapour pressure of sodium polysulfide solution will be the same as the vapour pressure for water.

Solid: The vapour pressure of the test item disodium tetrasulfide (EC no. 215-686-9) at 20 °C is 2 x 10-10 Pa.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

Solid: The vapour pressure of the test item disodium tetrasulfide (EC no. 215 -686 -9) was determined according to OECD guideline no. 104 [adopted on 27 July 1995] and EU test method A.4 [Council Regulation (EC) No 440/2008 of 30 May 2008] with the vapour pressure balance (effusion method).

For that determination, a sample of the test item is heated in a small furnace and placed in an evacuated bell jar. The furnace is covered by a lid which carries small holes of known diameters. The vapour of the substance, escaping through one of the holes, is directed onto a balance pan of a highly sensitive balance which is also enclosed in the evacuated bell jar. The momentum of the vapour jet acts as a force on the balance. The vapour pressure of the test item disodium tetrasulfide (EC no. 215-686-9) at 20 °C is 2 x 10-10 Pa.