Most storage-related chemical incidents happen not because a single chemical was mishandled, but because two incompatible chemicals ended up close enough to react if a container failed. Segregation by hazard class is the single most effective prevention.
Acids and Bases
Never store concentrated acids and alkalis in the same bunded area. A container failure that lets them mix can react violently, releasing heat and, depending on the specific chemicals, toxic gas. Keep them in physically separate areas with independent secondary containment.
Oxidizers and Combustibles/Organics
Oxidizing chemicals (hypochlorite products, hydrogen peroxide, nitric acid) must be kept well away from combustible material, organic chemicals, and reducing agents. Contact between an oxidizer and the wrong material can trigger fire or violent decomposition — this is one of the more common causes of avoidable warehouse fires.
Reactive Combinations Worth Naming Specifically
- Hypochlorite products + acids → releases toxic chlorine gas. Never mix or store where a leak could combine them.
- Ammonia solution + hypochlorite/chlorine products → releases toxic chloramine gas.
- Strong oxidizers + organic solvents → fire/explosion risk.
- Cyanide-related chemicals + acids → releases toxic hydrogen cyanide gas (relevant to some electroplating operations).
A Simple Rule of Thumb
When in doubt, store different hazard classes — acids, alkalis, oxidizers, flammables, and general chemicals — in physically separate bunded areas rather than relying on shelf position alone. Check the SDS for any chemical you're unsure about; the "incompatible materials" section exists specifically to answer this question.