tert-butyl peroxypivalate

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2011-05-24

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Qualifier:

no guideline required

GLP compliance:

no

Type of method:

other: Determination of the coldness stability of the test substance was performed with kryomat

Conclusions:

The test of the coldness stability of TBPPI shows that TBPPI is stable down to a temperature of -25 °C.

Executive summary:

Although the presented study does not measure the freezing point of tert- Butylperoxypivalate (TBPPI), it can still give a direction to a foreseen freezing temperature or range. The presented study examined the stability of tert-Butylperoxyisobutyrat 75 % in isododecane to coldness. The determination of the coldness stability of the test substance was performed with kryomat. The results showed that TBPPI is stable at a temperature of -25 °C, no changes in appearance and form (crystallization) were observed, meaning that the expected freezing point would be below -25 °C. Based on this result a performance of a freezing point measurement study was waived as according to column 2 of REACH Annex VII section 7.1, determination of melting point / freezing point does not need to be conducted the freezing point is expected to be lower than -20 °C.

Reference 2

Endpoint:

melting point/freezing point

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Description of key information

The melting / freezing point study was waived according to column 2 of REACH Annex VII section 7.1 as the freezing point of tert-Butylperoxypivalate (TBPPI) is expected to be lower than -20 °C. This temperature evaluation was based on a study that examined the stability of TBPPI to coldness, showing no crystallization at -25 °C. Therefore an freezing temperature below -25 °C is expected.