See Portable tank instruction T 23 of 4.2.5.2.6:

This portable tank instruction applies to self-reactive substances of Class 4.1 and organic peroxides of Class 5.2. The general provisions of Section 4.2.1 and the requirements of Section 6.7.2 shall be met. The additional provisions specific to self-reactive substances of Class 4.1 and organic peroxides of Class 5.2 in 4.2.1.13 shall also be met.

Minimum test pressure (bar): 4

Minimum shell thickness (mm-reference steel): See 6.7.2.4.2

Bottom opening requirements: See 6.7.2.6.3

Pressure-relief requirements: See 6.7.2.8.2, 4.2.1.13.6, 4.2.1.13.7, 4.2.1.13.8

Degree of filling: 	See 4.2.1.13.13