arpadveress 
Take care about the details. See the picture as whole… look at the standard mentioned on the label: EN 600079-15 (one 0 more)
Keep up good work!
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H2
Indeed H2 = Ex. As I see this fact surprises many in many ways. Current understanding of H2 by many simply says it is flammable. Not only, amoung others it is Ex as well.
#exprofessional
Let us learn from our history of Ex industries
Sewers explode in Guadalajara, Mexico, killing hundreds Dozens of sewer explosions in
Methodology of explosion protection
To avoid explosions, follow the steps in the following methodology when using
Explosion protection must be documented
Employers are responsible for preparing explosion protection documentation or similar (depending on
Simple but practicable