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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

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Elementary sulfur is a solid substance at 20°C of yellow color and characteristic "sulfur oxide" smell (GLP Testing Facility EZA, 2002). It can occur as a (bulk) block if solidified from molten sulfur, or can be milled to powder. It can also occur (naturally) as "flower of sulfur" which looks like a yellow coral. Sulfur can be produced in its molten state and stored as a liquid at approximately 130°C.

It melts at 113-120 ˚C (CONCAWE 2010; ChemService S. r. l. Testing Laboratory, 2005a) and boils at 444.6˚C (Rapporteur Member State: France, 2008). Its density is 2.07 at 20˚C (Rapporteur Member State: France, 2008). Sulfur is virtually insoluble in water (solubility at 22˚C is less than 5 μg/L) (ChemService S. r. l. Testing laboratory, 2005c) and has a negligible vapour pressure (0.00014 Pa at 20 ˚C) (ChemService S. r. l. Testing Laboratory, 2005b).

Sulfur is non-flammable (flame propagation significantly less than 200 mm in 4 minutes) (Notox B. V., 2007) and non-explosive (ChemService S. r. l. Testing Laboratory, 2005d; ChemService S. r. l. Testing Laboratory, 2005e).

In accordance with Column 2 of REACH Annexes VII-X, the conductance of the studies on partition coefficient, surface tension, flash point, auto-ignition temperature, oxidising properties, dissociation constant, viscosity and stability in organic solvents is not warranted.

In accordance with Column 2 of REACH Annex VII, a study for granulometry does not need to be conducted if the substance is marketed or used in a non solid or granular form.

Particle size determination was performed on the dust sample of sulfur. The following values have been obtained (ChemService S. r. l. Testing Laboratory, 2005f):

D10 = 5.65 μm; D50 = 17.94 μm; D90 = 53.48 μm.