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Physical & Chemical properties

Flammability

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Description of key information

The classification of organic peroxides into one of the seven categories “Types A to G” is given in the decision logic in Figure 2.15.1 of CLP, based on the test series A to H, as described in the part II of the UN-MTC. The substance is classified as Organic Peroxide Type D, Liquid, 3115.

Key value for chemical safety assessment

Additional information

According to chapter 2.15 of the CLP regulation, organic peroxides are thermally unstable substances or mixtures, which can undergo exothermic self-accelerating decomposition. In addition, they can have one or more of the following properties:

(i) be liable to explosive decomposition;

(ii) burn rapidly;

(iii) be sensitive to impact or friction;

(iv) react dangerously with other substances.

An organic peroxide is regarded as possessing explosive properties when in laboratory testing the mixture (formulation) is liable to detonate, to deflagrate rapidly or to show a violent effect when heated under confinement.

The classification of an organic peroxide into one of the seven categories “Types A to G” is dependent on its detonation, thermal explosion and deflagrating properties, its response to heating and the concentration.

Justification for classification or non-classification

Based on the results of the UN-MTC tests (below) and the decision logic, bis(3,5,5-trimethylhexanoyl) peroxide is classified as "Organic Peroxide Type D".

Phys-chem UN testing

UN test method

Concentration

Evaluation and results

Reference*

Propagation of detonation test series A

A.1, BAM 50/60 steel tube test

75 %

29 cm/ partial

 

Propagation of deflagration test series C

 

C.1, Time/Pressure test

75 %

415 ms/ no

 

C.2, Deflagration test

75 %

0 ms/ no

 

Effect of heating under defined confinement test series E 

E.1, Koenen test

75 %

< 1,0 mm (A), low

 

E.2, Dutch pressure vessel test

75 %

6,0 mm/ medium

 

Explosive power test series F

F.3, Trauzl Test

75 %

21 ml (10g), low

 

Self Accelerating Decomposition Temperature (SADT) test series H

H.4, Heat accumulation storage test (1000 ml Dewar vessel)

98 %

20 °C

 

*All Data are Company Data/ DATATOP/ UN Test Manual