Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Appearance:

The substance TBPPI is a colourless organic liquid at 20 °C and 1013 hPa.

 

Melting point:

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.

 

Boiling point:

TBPPI decomposes before boiling. Self-Accerelating Decomposition Temperature (SADT) of the substance is 25°C (reference SADT: CLP regulations 2.15.2.3 and UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 5th revised edition, sub-sections 28.1, 28.2, 28.3 and Table 28.3).

 

Density:

Using the pycnometer method, the density of tert-Butylperoxypivalat 75 % in isododecane (TBPPI) was determined to be 0.850 g/cm³ at 20 ± 0.2 °C.

Vapour pressure:

At temperatures between 38 °C to 53 °C vapour pressure between 402 to 1001 Pa were measured for tert-butyl peroxypivalate (TBPPI).

 

Partition coefficient:

The log Pow of TBPPI was determined to be 3.17 +/- 0.005 (with 95 % confidence interval). The estimated Pow was 1466 +/- 16 (with 95 % confidence interval).

 

Water Solubility

The water solubility of TBPPI was determined to be 1.49 +/- 0.11 g/L (95 % confidence interval) at 20 °C +/- 0.5 °C using the flask method for the performance of the main test. Thus, TBPPI was considered to be soluble.

 

Surface tension

In accordance with column 2 of REACH Annex VII, determination of surface tension (required in section 7.6) only needs to be conducted if based on the structure of the substance surface activity can be predicted. Based on the structure of the substance, no surface activity can be predicted (Ref.: R.7a: Guidance on information requirements and chemical safety assessment, EU-Document (May 2008)) and consequently no testing is required.

 

Flash point:

The Self - Accelerating Decomposition Temperature (SADT) of tert-butyl peroxypivalate (TBPPI) is 25°C (see study in IUCLID section 4.3). It is therefore expected that the substance will be decomposed before the flash point is reached (CLP regulations 2.15.2.3 and UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 5th revised edition, sub-sections 28.1, 28.2, 28.3 and Table 28.3 and ECHA guidance on the application of the CLP criteria, section 2.14). Thus, a study that determine the flash point is not required.

 

Auto flammability

Performance of an auto flammability study with tert-Butyl peroxypivalate (TBPPI) was waived as the substance decomposes under test conditions.

 

Flammability

Tests for flammability, flammability in contact with water and pyrophoric properties were waived as no such properties are expected for tert-butyl peroxypivalate (TBPPI).

 

Explosiveness:

Tert-butyl peroxypivalate (TBPPI) is considered to have no explosive properties as it is not classified as Organic Peroxide Type B (reference CPL regulations 2.15.2.2 and UN Recommendations on the transport of Dangerous Goods, 16th revised edition, Section 2.5.3.2.4. See also ECHA guidance on the application of CLP criteria, section 2.14). TBPPI is classified as organic peroxide Type C.

 

Oxidizing properties:

Test is not applicable for organic peroxides. In the CLP regulations Organic peroxides are not oxidizers. They are classified in a distinct hazard class (See also ECHA guidance on the application of the CLP criteria, section 2.14).

 

Viscosity

The viscosity (dynamic viscosity) of the test susbstance tert-butylperoxypivalate 75 % in isododecane was examined by an Ubbelohde viscometer in three separate measurements at 20°C. An average of the time measured (the time which takes for the liquid to pass between two marked points) was considered for the viscosity calculation. Thus, the viscosity result obtained for tert-butylperoxypivalate 75 % in isododecane was 1.7 mPAS.