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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, H242.

Key value for chemical safety assessment

Additional information

Flammability:

Section 4.13 Flammability of IUCLID - Summary

 

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.

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 Directive 67/548/EEC (DSD) and 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).