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Physical & Chemical properties

Flammability

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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
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
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
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

Description of key information

The endpoint is waived:  di-tert-butyl 3,3,5-trimethylcyclohexylidene diperoxide is classified as a peroxide Type B.  Flammability is an intrinsic hazard in this class.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

Flammability:
flammable

Additional information

Test A10: liquids Test method only applicable for solids.

Test A12: water reactivity Based on the molecular structure as well as experience in handling and use shows that the substance has no water reactive properties.

Test A13: pyrophoric properties Based on the molecular structure as well as experience in handling and use shows that the substance has no pyrophoric properties.

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.

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.

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.

Justification for classification or non-classification

Substance name

CAS

Trade name

Leads max. concentration

di-tert-butyl 3,3,5-trimethylcyclohexylidene

6731-36-8

Trigonox 29

100%

diperoxide

Phys-chem UN testing

UN test method

Concentration

Evaluation and Results

 

Propagation of detonation test series A

A.1,BAM 50/60 steel tube test

100%

19 cm, No

 

Propagation of deflagration test series C

C.1, Time/Pressure test

100%

-

 

C.2, Deflagration test

100%

0.33 mm/s, No

Effect of heating under defined confinement test series E

E.1, Koenen test

100%

2.0 mm (F), Violent

 

E.2, Dutch pressure vessel test

100%

10 mm (10 g), Violent

 

Explosive power test series F

F.3, Trauzl Test

100%

Not needed for Type B

 

Self Accelerating Decompostion Temperature (SADT) test series H

H.4, Heat accumulation storage test (400 ml Dewar vessel)

100%

60 ºC

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

Organic Peroxide, Type B, Liquid, 3101