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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 as Organic Peroxide Type C, H241.

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.

 

Self-reactive substance

According to Guidance on information requirements and chemical safety assessment, R7a, Endpoint specific guidance, R.7.1.10.4, the UN test series A - H for self-reactive substances and mixtures, do not need to be conducted as the substance is classified as organic peroxide.

Justification for classification or non-classification

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). Based on the results of the UN-MTC tests and the decision logic tert-butylperoxyisobutyrate is classified as Organic Peroxide Type B with H241 (heating may cause a fire or explosion) according to Regulation (EC) No 1272/2008 (CLP).