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Description of key information

Tert-amyl hydroperoxide is classified as Organic Peroxide Type E, H242. 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


Additional information

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

Tert-amyl hydroperoxide is classified as Flammable liquid Cat3 according CLP regulation n°1272/2008, based on its flash point (36.5°C).

Based on the results of the UN-MTC tests (below) and the decision logic, the substance is classified as Organic Peroxide Type E.

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 tAHP/DTA/water : 83% / 9% / 8% 16.5 mm; no  
Propagation of deflagration test series C C.1, Time/Pressure test tAHP/DTA/water : 83% / 9% / 8% 9999 ms; no  
C.2, Deflagration test   0.13 mm/s; no  
Effect of heating under defined confinement test series E E.1, Koenen test tAHP/DTA/water : 83% / 3% / 10% 1 mm; low  
E.2, Dutch pressure vessel test tAHP/DTA/water : 83% / 9% / 8% 2 mm; low  
Explosive power test series F F.3, Trauzl Test tAHP/DTA/water : 83% / 9% / 8% 14 ml, low  
Self Accelerating Decomposition Temperature (SADT) test series H H.4, Heat accumulation storage test (400 ml Dewar vessel) tAHP/DTA/water : 83% / 9% / 8% 60°C  

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