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Physical & Chemical properties

Explosiveness

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Description of key information

In accordance with section 1 of REACH Annex XI, the study does not need to be performed if there may be sufficient weight of evidence from several independent sources of information leading to the conclusion that dibenzoyl peroxide is explosive.
Moreover, we can assume that Dibenzoyl peroxide has explosive properties because it is classified as Organic Peroxide Type B (reference CLP regulations 2.15.1.2, 2.15.2.2 and UN Recommendations on the Transport of Dangerous Goods, 16th revised edition, section 2.5.3.2.4).

Key value for chemical safety assessment

Explosiveness:
explosive

Additional information

The determination of the explosive properties of dibenzoyl peroxide has been waived according to the section 1 of REACH Annex XI (there is sufficient weight of evidence from several independent sources of information leading to the conclusion that dibenzoyl peroxide is explosive) and according to our experience.

Indeed, the explosive properties of dibenzoyl peroxide are well known and cited in many regulations:

- CLP regulations - Annex VI - Part 3 - Index No. 617 -008 -00 -0: the substance is classified "Organic Peroxide Type B: Heating may cause fire or explosion" (according to the 67/548/EC - Annex I: the substance was classified "E; R3: Extreme risk of explosion by shock, friction, fire or other sources of ignition").

- UN Recommendations on the Transport of Dangerous Goods, Volume I, section 2.2.52.4: Dibenzoyl peroxide - between 51% and 100%: UN Number 3102 (Organic peroxide Type B, Solid) with the additionnal label "Explosive".

Moreover, many data coming from literature indicate that the substance would be explosive.

Justification for classification or non-classification

In the CLP Regulation, Organic peroxides are not classified as explosive, they are classified in a distinct hazard class which include the explosive properties (reference CLP regulations 2.15).

According to CLP Regulation (EC) No.1272/2008 - Annex VI - Part 3 - Index No. 617 -008 -00 -0, Dibenzoyl peroxide is classified as Organic Peroxide Type B (H241: Heating may cause fire or explosion).

According to the Direction 67/548/EEC, Annex I, Dibenzoyl peroxide was classified "E; R3: Extreme risk of explosion by shock, friction, fire or other sources of ignition".