Strontium di(acetate)

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22-23 of june 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

GLP compliance:

not specified

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch : 17025 25/26/28
- Expiration date of the lot/batch: 13 may 2020
- Manufacturing date: 13 may 2017
Strontium diacetate used as test item is hemihydrated

Key result

Melting / freezing pt.:

>= 310.25 - <= 313.6 °C

Atm. press.:

1 Bar

The temperature of melting and melting enthalpy is presented in the following table.

Table: Temperature of melting of Sr(OAC)2

No of measurement	Tonset [°C]	Tmax [°C]	DeltaHf [J/g]
1	310,3	314,0	48,64
2	310,2	313,2	43,87
Results	310,25 ± 0,07	313,6 ± 0,56	46,25 ± 3,3

Remark: The values temperature obtained by DSC which is dynamic method depends on heating rate and may be different from results obtained by static methods.

After dehydration of Sr(AC)2·0.5H2O at 180°C-212 °C (mass loss of 5,36%), the second step of mass loss 22,53% between 380 to 500 °C can be assigned to the decomposition of anhydrous Sr(AC)2 to SrCO3. There are two sharp endothermic peaks with maximum values of 313 and 340°C in DSC curve with no corresponding mass loss in TG curve. It suggests two-phase change processes occurred in this temperature range. The sharp DSC peak at about 313°C can be assigned to the endothermic melting process.

Conclusions:

The determination of the melting point was performed by Differential scanning calorimetry with thermogravimetry as described in the OECD Guideline 102 (Melting point/Melting Range).
After loss of water at 150°C, the melting started at 310°C. The sharp DSC peak at about 313°C can be assigned to the endothermic melting process.

Description of key information

The determination of the melting point was performed by Differential scanning calorimetry with thermogravimetry as described in the OECD Guideline 102 (Melting point/Melting Range).

After loss of water at 150°C, the melting started at 310°C. The sharp DSC peak at about 313°C can be assigned to the endothermic melting process.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

313 °C