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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 of “Types A to G” is given in decision logic 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 by UN as Organic Peroxide Type D, H242.

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 in 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,1,4-bis[1-(tert-butylperoxy)-1-methylethyl]benzene 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 t.p. ca 96% assay 20 cm; no Company data
   
Propagation of deflagration test series C C.1, Time/Pressure test 1545 ms; slow Datatop
  C.2, Deflagration test 0.36 mm/s; slow Datatop
Effect of heating under defined confinement test series E E.1, Koenen test 1.5mm; medium Datatop
  E.2, Dutch pressure vessel test 8 mm medium Datatop
   
Explosive power test series F F.3, Trauzl Test 21 ml; low Datatop
   
Self Accelerating Decomposition Temperature (SADT) test series H H.4, Heat accumulation storage test (400 ml Dewar vessel)   80°C Datatop

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

According to Guidance on information requirements and chemical safety assessment, R7a, Endpoint specific guidance, R.7.1.10.7, the UN Test method N.4, for self-heating substances and mixtures does not need to be conducted as the substance is classified as organic peroxide. Thus the substance is not classified as self-heating under CLP.