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Flammability

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Endpoint:
flammable solids
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted for organic peroxides
Endpoint:
pyrophoric solids
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
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

Description of key information

The endpoint is waived: The method is not applicable because according to the ECHA guidance in the application of CLP criteria, 2.8.3, organic peroxides should not be considered for classification as flammable solids since flammability is an intrinsic hazard in this class. Dihexadecyl peroxodicarbonate is an Organic Peroxide, Type D.

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 ECHA Guidance to CLP flammability of solids (test A10) is not relevant for peroxides as they should not be classified as flammable solid, since flammability is an intrinsic hazard of peroxides;

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.

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, dihexadecyl peroxodicarbonate is an Organic Peroxide, Type D.

Substance name

CAS

Trade name

Leads max. concentration

Leader

dihexadecyl peroxodicarbonate

26322-14-5

Perkadox 24

100%

AkzoNobel

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

100%

13 cm, No

UN Manual of Tests and Criteria

 

 

Propagation of deflagration test series C

C.1, Time/Pressure test

100%

<2070 kPa, No

AN data, DATATOP

 

C.2, Deflagration test

100%

0 mm/s, No

AN data, DATATOP

Effect of heating under defined confinement test series E

E.1, Koenen test

100%

<1.0 mm (O), No

DATATOP

 

E.2, Dutch pressure vessel test

100%

<1.0 mm (10g), Low

AN data, DATATOP

 

 

Explosive power test series F

F.3, Trauzl Test

100%

5 ml, No

DATATOP

 

 

Self Accelerating Decomposition Temperature (SADT) test series H

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

100%

40 ºC

AN data, DATATOP

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

Organic Peroxide, Type F, Solid, Temperature controlled, 3120