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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer-reviewed handbook data and publication providing sufficient information for evaluation.
Principles of method if other than guideline:
Handbook data, no information on test details.
GLP compliance:
not specified
Melting / freezing pt.:
72.2 °C
Sublimation:
no
Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer-reviewed handbook data.
Principles of method if other than guideline:
Handbook data, no information on test details.
GLP compliance:
not specified
Melting / freezing pt.:
48 °C
Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer-reviewed handbook data and publication providing sufficient information for evaluation.
Principles of method if other than guideline:
Handbook data, no information on test details.
GLP compliance:
not specified
Type of method:
other: Handbook data
Key result
Melting / freezing pt.:
1 089 °C
Sublimation:
no
Remarks on result:
other: see Remarks
Remarks:
Pressure has not been indicated.

The melting point of 1089°C refers to the anhydrous form of sodium metasilicate. Hydrated forms (Na2SiO3xH2O) have a much lower melting point, depending on the hydration level.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Publication providing sufficient information for evaluation.
Principles of method if other than guideline:
Crystals were rotated in a thermostat and temperature raised by 0.05°C per day. No more information on test details.
GLP compliance:
not specified
Melting / freezing pt.:
47.9 °C
Sublimation:
no

Description of key information

1089°C

Key value for chemical safety assessment

Additional information

Solid crystalline silicates have discrete melting points which depend on the content of crystallisation water.