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Physical & Chemical properties

Melting point / freezing point

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Description of key information

The melting point of the reaction mass of hematite and quartz is above 850°C. This is the roasting temperature in the production process (see Section 3.1 of the IUCLID).  The melting point of all of the major constituents are >1000 degrees C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
850 °C

Additional information

The melting point of the Substance is above 850°C - this is the roasting temperature in the production process (see Section 3.1 of the IUCLID). The melting point of diiron trioxide, one of the major constituents, was 1565°C (Lide 2002). The other major constituent, Quartz, also has a very high melting point (above 1000 C) similar to diiron trioxide. The melting point of the other main constituent, the Feldspar-group of minerals, is above 1200°C. Thus there is sufficient weight of evidence that the Substance has a melting point above 850°C.

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