Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

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.