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Physical & Chemical properties

Flammability

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Description of key information

The endpoint is waived: Organic peroxides should not be considered for classification as flammable since flammability is an intrinsic hazard in this class.

O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate is  classified as 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

Test A10: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.

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,

O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate is classified as an organic peroxide type D.

Substance name

CAS

Trade name

Leads max. concentration

Leader

O-(2-ethylhexyl) O,O-tert-pentyl peroxycarbonate

70833-40-8

Trigonox 131

100%

AkzoNobel

Phys-chem UN testing

UN test method

Concentration

Evaluation and Results

Reference*

 

 

Propagation of detonation test series A

A.2,tno 50/70 steel tube test

100%

9, 10 cm, No

 

 

 

Propagation of deflagration test series C

C.1, Time/Pressure test

100%

<2070 kPa, No

 

 

C.2, Deflagration test

100%

0.22 mm/s, No

 

Effect of heating under defined confinement test series E

E.1, Koenen test

100%

1.0 mm, Low

 

 

E.2, Dutch pressure vessel test

100%

5.0 mm, Medium

 

 

 

Explosive power test series F

F.3, Trauzl Test

100%

Test not needed for Type D

 

 

 

Self Accelerating Decomposition Temperature (SADT) test series H

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

100%

55 ºC

 

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


Organic Peroxide, Type D, Liquid, 3105