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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
other: Expert Assessment
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Principles of method if other than guideline:
Assessment
Type of method:
other: Assessment
Remarks on result:
other: >500 C

Assessment

Conclusions:
This substance is a UVCB characterised as Silicic acid (H4SiO4), zirconium(4+) salt (1:1), reaction products with sodium hydroxide (304-802-4, 94279-56-8). It is the product of a reaction between Zircon (EC no 239-019-6) and sodium hydroxide. In common with other or similar substances and has a very high melting point; from theoretical considerations, the melting point would be expected to be significantly in excess of 500°C (873K); this is evidenced by the fact that the finished products emerges from a furnace at >500°C in a solid form. The melting point would be almost impossible to measure with any degree of accuracy. The melting point of this substance may therefore be stated as >500°C.

Description of key information

The melting point of this substance is>500°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
500 °C

Additional information

This substance is an inorganic silicate and, in common with other or similar substances and has a very high melting point; from theoretical considerations, the melting point would be expected to be significantly in excess of 500°C (873K); this is evidenced by the fact that the finished products emerges from a furnace at>500°C in a solid form. The melting point would be almost impossible to measure with any degree of accuracy. The melting point of this substance may therefore be stated as>500°C.