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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
other: review article
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Collection of data
Qualifier:
no guideline followed
Principles of method if other than guideline:
compilation of published data
GLP compliance:
no
Type of method:
other: compilation of published data
Key result
Melting / freezing pt.:
>= 730 - <= 870 °C
Remarks on result:
other: see Remarks
Remarks:
Flow point.

Due to their glass nature, solid amorphous silicates do not have discrete melting points but rather flow points. They reversibly solidify and soften within a broad temperature range depending on their molar ratio. Sodium silicate lumps start to soften at 550 - 670°C and reach the flow point at 730 - 870°C. Aqueous silicate solutions have a melting point only slightly lower than that of water.

Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Handbook data
Principles of method if other than guideline:
Handbook data, no information on test details.
Melting / freezing pt.:
840 °C
Decomposition:
no

RM-Freetext:
Due to their glass nature, solid amorphous silicates do not
have discrete melting points but rather flow points. They
reversibly solidify and soften within a broad temperature
range depending on their molar ratio. The given value relates to the flow  point. The softening point is 655°C.

Endpoint:
melting point/freezing point
Type of information:
other: Handbook data
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Handbook data
Principles of method if other than guideline:
Handbook data, no information on test details.
Melting / freezing pt.:
760 °C
Decomposition:
no

RM-Freetext:
Due to their glass nature, solid amorphous silicates do not
have discrete melting points but rather flow points. They
reversibly solidify and soften within a broad temperature
range depending on their molar ratio. The given value relates to the flow  point. The softening point is 590°C.

Description of key information

730 - 870 °C (flow point)

Key value for chemical safety assessment

Additional information

Due to their glass nature, solid amorphous silicates do not have discrete melting points but rather flow points. They reversibly solidify and soften within a broad temperature range depending on their molar ratio. Sodium silicate lumps start to soften at 550 - 670 °C and reach the flow point at 730 - 870 °C. Aqueous solutions have a melting point only slightly lower than that of water.