tert-butyl peroxypivalate

Flammability

Link to relevant study record(s)

Reference

Reference 1

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

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

Reference 3

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

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

Reference 5

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 6

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 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, the substance shows no water reactive properties.

 

Pyrophoric properties:

Based on the molecular structure as well as experience in handling and use the 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.

 

Flammable aerosol:

According to Guidance on information requirements and chemical safety assessment, R7a, Endpoint specific guidance, R.7.1.21.1, a study for flammable Aerosol does not need to be conducted as tert-Butylperoxy-3,5,5-trimethylhexanoat does not meet the definition for Aerosol.

Justification for classification or non-classification

Based on the results of the UN-MTC tests (below) and the decision logic, tert-butyl peroxypivalate 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	75 %	cav. version 16 cm, No
Propagation of deflagration test series C	C.1, Time/Pressure test	75 %	494 ms, Yes, slowly
	C.2, Deflagration test	75 %	0.08 mm/s, No
Effect of heating under defined confinement test series E	E.1, Koenen test	75 %	2.0 mm, Violent
	E.2, Dutch pressure vessel test	75 %	7.0 mm, Medium
Explosive power test series F	F.3, Trauzl Test	75 %	14.0 mL/ 10g, Low
Explosion as packaged for transport series G	G.1 Thermal explosion test in package	80 %	package type 6HG2, 30l, No
Self Accelerating Decomposition Temperature (SADT) test series H	H.4, Heat accumulation storage test (400 ml Dewar vessel)	75 %	25 °C

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

 

Classification of 75%:

According to UN: Organic Peroxide Type C, liquid, temperature-controlled, UN 3113

 

Based on the study results, the molecular structure and experience in handling and use, the substance is not classified and labelled as flammable, flammable in contact with water, pyrophoric, self-reactive substance and self-heating substance according to Regulation (EC) No 1272/2008 (CLP). In additon based on the results of the UN-MTC tests, the decision logic and in accordance with Regulation (EC) No 1272/2008 tert-butyl peroxypivalate is classified as Organic Peroxide Type C with H242 (heating may cause a fire).