tert-butyl α,α-dimethylbenzyl peroxide

Flammability

Link to relevant study record(s)

Reference

Reference 1

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

Reference 2

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

Reference 3

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

Reference 4

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.

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.