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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 the CLP Regulation, based on the test series A to H, as described in the Part II of the UN-MTC. Bis(4-tert-butylcyclohexyl)peroxydicarbonate is classified as Organic Peroxide Type C, H242.

Key value for chemical safety assessment

Additional information

According to chapter 2.15 of Annex I 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, bis(4-tert-butylcyclohexyl) peroxydicarbonate is classified as Organic Peroxide Type C.

Phys-chem UN testing

UN test method


Evaluation and Results


Propagation of detonation test series A

A.1,BAM 50/60 steel tube test

100 %

33 cm/partial


Propagation of deflagration test series C


C.1, Time/Pressure test

100 %

14 ms/yes, rapidly


C.2, Deflagration test

100 %

6 mm/yes, rapidly


Effect of heating under defined confinement test series E 

E.1, Koenen test

100 %

<1,0 mm (A), low


E.2, Dutch pressure vessel test

100 %

3,0 mm/low


Explosive power test series F

F.3, Trauzl Test

100 %

13 ml (10g), low


Explosion as packaged for transport series G

G.2 Accelerating decomposition test in package

100 %

package type 1 lbs, No

Self Accelerating Decomposition Temperature (SADT) test series H

H.4, Heat accumulation storage test (1000 ml Dewar vessel)

100 %

40 °C


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