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Physical & Chemical properties

Flammability

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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

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, the test substance shows no water reactive properties.

 

Pyrophoric properties:

Based on the molecular structure as well as experience in in handling and use the test substance shows 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 results of the UN-MTC tests (below) and the decision logic, tert-Butylperoxy-2-ethylhexanoate is classified as Organic Peroxide Type C.

Phys-chem UN testing

UN test method

Concentration

Evaluation andResults

Reference

Propagation of detonation test series A

A.1,BAM 50/60 steel tube test

100%

18 cm, No

Company Data/ DATATOP/ UN Test Manual

Propagation of deflagration test series C

C.1, Time/Pressure test

100%

3000 ms, Yes, slowly

Company Data/ DATATOP/ UN Test Manual

C.2, Deflagration test

100%

0.74 mm/s, Yes, slowly

Company Data/ DATATOP/ UN Test Manual

Effect of heating under defined confinement test series E

E.1, Koenen test

100%

2.0 mm, Violent

Company Data/ DATATOP/ UN Test Manual

E.2, Dutch pressure vessel test

100%

9.0 mm, Violent

Company Data/ DATATOP/ UN Test Manual

Explosive power test series F

F.3, Trauzl Test

100%

28.0 ml/ 10g, Not low

Company Data/ DATATOP/ UN Test Manual

Explosion as packaged for transport series G

G.1 Thermal explosion test in package

100%

package type 6HG2, 30l, No

Company Data/ DATATOP/ UN Test Manual

Self Accelerating Decomposition Temperature (SADT) test series H

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

100%

40°C

Company Data/ DATATOP/ UN Test Manual

A flash point of 78 °C was determined (see section 4.11).

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 Directive 67/548/EEC (DSD) and Regulation (EC) No 1272/2008 (CLP).Based on the results of the UN-MTC tests and the decision logic tert-Butylperoxy-2-ethylhexanoate is classified as Organic Peroxide Type C with H242 (heating may cause a fire) according to Regulation (EC) No 1272/2008 (CLP).