Phosphoric acid, butyl ester, sodium salt

Stability: thermal, sunlight, metals

Link to relevant study record(s)

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-02-22 to 2018-03-20

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test substance thermally stable:

yes

Sublimation:

not determined

Transformation products:

not measured

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

In the temperature range of 160 – 180 °C a small exothermic effect was detected. A small endothermic effect can be observed in the temperature range of 220 – 230 °C, directly followed by an exothermic effect in the temperature range of 230 – 290 °C. One and two further exothermic effects, respectively, were detected in the temperature range of 370 – 390 °C and 380 – 440 °C, respectively.The overall exothermic energy was up to -90 J/g

 

Results of the DSC-measurements

No.	Sample weight / mg	Start of effect / °C	Energy / J/g	Remark
PN14981	8.35	160 210 230 330 410	<-10 (exothermic) 10 (endothermic) -50 (exothermic) -20 (exothermic) -20 (exothermic)
PN14982	7.57	160 220 230 370	<-10 (exothermic) <10 (endothermic) -40 (exothermic) <-10 (exothermic)

 

Conclusions:

The substance is thermal stable at ambient conditions.

Executive summary:

A study was conducted according to OECD TG 133 to determine the thermal stability of the test item using DSC measurement. The test item was weighed in under an inert atmosphere (nitrogen) into the glass crucible. In the temperature range of 160 – 180 °C a small exothermic effect was detected. A small endothermic effect can be observed in the temperature range of 220 – 230 °C, directly followed by an exothermic effect in the temperature range of 230 – 290 °C. One and two further exothermic effects, respectively, were detected in the temperature range of 370 – 390 °C and 380 – 440 °C, respectively. The overall exothermic energy was up to -90 J/g. According to the OECD guideline 113 criteria the test item was considered to be thermal stable at room temperature as no decomposition or chemical transformation was found below 150°C.

Description of key information

The substance is thermal stable at ambient conditions.

Additional information

A study was conducted according to OECD TG 133 to determine the thermal stability of the test item using DSC measurement. The test item was weighed in under an inert atmosphere (nitrogen) into the glass crucible. In the temperature range of 160 – 180 °C a small exothermic effect was detected. A small endothermic effect can be observed in the temperature range of 220 – 230 °C, directly followed by an exothermic effect in the temperature range of 230 – 290 °C. One and two further exothermic effects, respectively, were detected in the temperature range of 370 – 390 °C and 380 – 440 °C, respectively. The overall exothermic energy was up to -90 J/g. According to the OECD guideline 113 criteria the test item was considered to be thermal stable at room temperature as no decomposition or chemical transformation was found below 150°C.