2.15. Organic peroxides

2.15.1.1. Organic peroxides means liquid or solid organic substances which contain the bivalent -O-O- structure and may be considered derivatives of hydrogen peroxide, where one or both of the hydrogen atoms have been replaced by organic radicals. The term organic peroxide includes organic peroxide mixtures (formulations) containing at least one organic peroxide. 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:

2.15.1.2. 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.

2.15.2.1. Any organic peroxide shall be considered for classification in this class, unless it contains:

2.15.2.2. Organic peroxides shall be classified in one of the seven categories of ‘Types A to G’ for this class, according to the following principles:

2.15.4.1. Organic peroxides are classified by definition based on their chemical structure and on the available oxygen and hydrogen peroxide contents of the mixture (see 2.15.2.1). The properties of organic peroxides which are necessary for their classification shall be determined experimentally. The classification of organic peroxides shall be performed in accordance with test series A to H as described in Part II of the ►M4  UN RTDG ◄ , Manual of Tests and Criteria. The procedure for classification is described in Figure 2.15.1.

2.15.4.2. Mixtures of already classified organic peroxides may be classified as the same type of organic peroxide as that of the most dangerous component. However, as two stable components can form a thermally less stable mixture, the SADT of the mixture shall be determined.

Type F

Type E

Type D

Type C

Type B

Type A

Type G

1.3 No

6.1 Yes

7.1 Violent

Box 10 Test G

10.2 No

7.2 Medium

7.3 Low

7.4 None

8.1 Violent

8.2 Medium

8.3 Low

8.4 None

9.1 Violent

9.2 Medium

16.2 No

16.1 Yes

Is a diluent with a boiling point of < 150 °C used?

Box 16

15.2 No

15.1 Yes

Is the substance a solid?

Box 14 Test H

14.1 Yes

13.1 Low

12.2 Low

What is the effect of heating it under defined confine- ment?

Box 13 Test E

12.1 Not low

12.3 None

Box 12 Test F

5.2 Yes, slowly

11.1 Yes

Packaged in packages of more than 400 kg/450 l or to be considered for exemption?

What is the effect of heating it under defined confinement?

9.3 Low

9.4 None

Box 9 Test E

Box 8 Test E

What is the effect of heating it under defined confinement?

What is the effect of heating it under defined confinement?

Box 7 Test E

6.2 No

Does it deflagrate rapidly in package?

Box 6 Test D

5.1 Yes rapidly

Box 5 Test C

Can it propagate a defla-gration?

3.2 Yes, slowly

3.3 No

4.2 Yes, slowly

4.3 No

Can it propagate a defla-gration?

Box 4 Test C

4.1 Yes, rapidly

Box 2 Test B

Box 3 Test C

Can it propagate a defla-gration?

Does it propagate a deto-nation?

10.1 Yes

11.2 No

13.2 None

14.2 No

Box 15

Box 11

Box 1 Test A

5.3 No

1.2 Partial

3.1 Yes, rapidly

2.2 No

2.1 Yes

1.1 Yes

Is the SADT <60°C in a 50 kg package?

What is its explosive power?

Can it explode as packaged?

Can it detonate as packaged?

ORGANIC PEROXIDE