GHS hazard class · Physical hazards
Self-reactive substances and mixtures; Organic peroxides
Self-reactive substances and mixtures are thermally unstable liquids or solids that can decompose strongly even without oxygen. Organic peroxides are organic substances containing the bivalent -O-O- structure that are also thermally unstable and may decompose, burn or react dangerously. Both are rated by type (A to G) depending on how violently they decompose.
What it means
The material can decompose with heat release, fire or explosion if it gets too warm, is contaminated, or is confined. Type A and B materials can explode or burn violently.
What to do
Keep at the temperature the supplier specifies, away from heat, sparks and flames, avoid contamination and friction or impact, keep in the original container, and store away from combustible and incompatible materials.
This is general guidance for the class. Your product's safety data sheet takes precedence.
Categories and hazard statements
Chemicals with self-reactive substances and mixtures; organic peroxides hazard codes
Chemicals in our database whose primary classification includes any current Self-reactive substances and mixtures; Organic peroxides code (H240, H241, H242).
No chemicals in our database carry these codes yet.
Self-reactive substances and mixtures; Organic peroxides: frequently asked questions
What is the GHS hazard class "Self-reactive substances and mixtures; Organic peroxides"?
Self-reactive substances and mixtures are thermally unstable liquids or solids that can decompose strongly even without oxygen. Organic peroxides are organic substances containing the bivalent -O-O- structure that are also thermally unstable and may decompose, burn or react dangerously. Both are rated by type (A to G) depending on how violently they decompose.
Which hazard statements belong to Self-reactive substances and mixtures; Organic peroxides?
The current hazard statements for this class are H240, H241, H242.
Which pictograms and signal words are used for Self-reactive substances and mixtures; Organic peroxides?
Pictograms: GHS01 (Exploding Bomb), GHS02 (Flame). Signal words: Danger or Warning, depending on the category.
What should I do when working with a self-reactive substances and mixtures; organic peroxides hazard?
Keep at the temperature the supplier specifies, away from heat, sparks and flames, avoid contamination and friction or impact, keep in the original container, and store away from combustible and incompatible materials.
https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)