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Physical & Chemical properties

Flammability

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Endpoint:
self-heating substances / mixtures
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted for organic peroxides
Endpoint:
flammable solids
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is a liquid
Endpoint:
substances / mixtures which in contact with water emit flammable gases
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water
Endpoint:
pyrophoric liquids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

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 E, 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

The results of the UN-MTC tests are presented below. Tert-butyl cumyl peroxide is classified as Organic Peroxide Type E by UN.

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. cavitated: 23 cm; no Datatop
   
Propagation of deflagration test series C C.1, Time/Pressure test 9999 ms; no Datatop
  C.2, Deflagration test 0.05 mm/s; no Datatop
Effect of heating under defined confinement test series E E.1, Koenen test 1mm, low Datatop
  E.2, Dutch pressure vessel test 2mm; low Datatop
   
Explosive power test series F F.3, Trauzl Test 12 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.