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Flammability

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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:
flammable gases
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:
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:
pyrophoric 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:
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
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

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 as Organic Peroxide Type C, H242.

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Flammability:


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


 


Flammability in contact with water:


Based on the molecular structure as well as experience in handling and use shows that the substance has no water reactive properties.


 


Pyrophoric properties:


Based on the molecular structure as well as experience in handling and use shows that the substance has no pyrophoric properties.


 


Self-heating substance


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.

Justification for classification or non-classification

Based on the results of the UN-MTC tests (below) and the decision logic, 1,1-Di (tert-butylperoxy) cyclohexane is classified as Organic Peroxide type C.


 



































































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



80%



19 cm, No



 



Propagation of deflagration test series C



C.1, Time/Pressure test



80%



no data



 



C.2, Deflagration test



80%



0,07 mm, No



 



Effect of heating under defined confinement test series E



E.1, Koenen test



80%



3,5 mm, violent



 



E.2, Dutch pressure vessel test



80%



14 mm, violent



 



Explosive power test series F



F.3, Trauzl Test



80%



Test not needed for Type C



 



Explosion as packaged for transport series G



G.2 Accelerating decomposition test in package



 80%



package type 40 lbs, No



 



Self Accelerating Decomposition Temperature (SADT) test series H



H.4, Heat accumulation storage test (400 ml Dewar vessel)



 80%



60 °C



 



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


 


Classification of 80%:


According to UN/ test results: Organic Peroxide Type C, liquid UN 3103


 


Based on the study results, the molecular structure and experience in handling and use, the substance is not classified and labelled as flammable in contact with water, pyrophoric, self-reactive substance and self-heating substance according to Regulation (EC) No 1272/2008 (CLP). In addition based on the results of the UN-MTC tests and the decision logic, 1,1-Di (tert-butylperoxy) cyclohexane is classified as Organic Peroxide Type C.