Di-tert-butyl peroxide

Flammability

Link to relevant study record(s)

Reference

Reference 1

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

Interpretation of results:

not classified based on GHS criteria

Reference 2

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

Interpretation of results:

not classified based on GHS criteria

Reference 3

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

Interpretation of results:

not classified based on GHS criteria

Reference 4

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

Interpretation of results:

not classified based on GHS criteria

Description of key information

The endpoint is waived: Di-tert-butyl peroxide is classified as a  peroxide type E. Flammability is an intrinsic hazard in this class. 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. 

Key value for chemical safety assessment

Flammability:

flammable

Additional information

Test A10:Test method only applicable for solids.           

Test A12: water reactivity:        

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

Test A13: pyrophoric properties:          

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

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-reactivesubstances and mixtures, do not need to be conducted as the substance is classified as organic peroxide.

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.

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

Based on the results of the UN-MTC tests (below) and the decision logic,  Di-tert-butyl peroxide is classified as a peroxide type E.

Substance name	CAS	Trade name	Leads max. concentration	Leader
Di-tert-butyl peroxide	110-05-4	Trigonox B	100%	AkzoNobel
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	100%	16 cm, No
Propagation of deflagration test series C	C.1, Time/Pressure test	100%	100 - 200 ms, Yes slowly
	C.2, Deflagration test	100%	0.29 mm/s, No
Effect of heating under defined confinement test series E	E.1, Koenen test	100%	<1.0 mm (0), No
	E.2, Dutch pressure vessel test	100%	3.5 mm (10 g), Medium
Explosive power test series F	F.3, Trauzl Test	100%	Not needed for Type E
Self Accelerating Decompostion Temperature (SADT) test series H	H.4, Heat accumulation storage test (400 ml Dewar vessel)	100%	80 ºC
*All Data are Company Data/ DATATOP/ UN Test Manual
Organic Peroxide, Type E, Liquid, 3107

The substance is harmonized as flammable (Cat 2), supported by the flashpoint (see 4.11).