Storage Compatibility Checker
Zero Residue · Free tool
Enter the chemicals in a storage area. See which ones must be kept apart, and exactly what happens if they mix.
Check one cabinet or shelf free — up to 10 chemicals
0 / 10 free
Reactivity data: US EPA and NOAA — public-domain reactive-group compatibility data. 68 reactive groups, 2,346 pairwise outcomes. Cross-verified against US EPA method EPA-600/2-80-076, A Method for Determining the Compatibility of Hazardous Wastes (Hatayama et al., 1980). Reference only — informs, does not certify.
Reference only. Not legal or regulatory advice. Verify against the primary source before you act.
How it works
Every chemical in the reference dataset is assigned to one or more of 68 reactive groups (e.g. Acids, Strong Non-oxidizing; Cyanides, Inorganic; Ketones). The dataset documents 2,346 pairwise outcomes between those groups — Compatible, Caution, or Incompatible — each with hazard codes and, where known, the specific gas produced.
Because 55% of chemicals carry more than one reactive group, this tool evaluates every group combination between two chemicals and reports the single worst outcome across all of them — never a guess from just one of a chemical's groups.
A result of "no reaction predicted" (NR) means the dataset has no documented hazardous reaction between those groups — it is not a certification that co-storage is safe. Always confirm against each product's Safety Data Sheet.
Worked example
Sodium cyanide carries one group, Cyanides, Inorganic. Hydrochloric acid, solution carries two — Acids, Strong Non-oxidizing and Water and Aqueous Solutions. The tool checks both of hydrochloric acid's groups against cyanide's and keeps the worse result: Acids × Cyanides is Incompatible (gas HCN), which outranks the Caution result from Water × Cyanides — so the pair renders Incompatible, not Caution. This is the multi-group worst-case rule in action, on the two real dataset rows 1×11 and 11×100.
Acetal (Ethers) and Acetone (Ketones) have no documented hazardous reaction between their groups (row 14×19: Compatible, NR). The tool renders this as "no reaction predicted" — never as "safe" — since concentration, container, and mixture effects are outside what any two-group prediction can capture.
Related tools
Data vintage
- Data: CAMEO Chemicals reactivity data, NOAA Office of Response and Restoration with the U.S. EPA Office of Emergency Management CAMEO Chemicals 3.1.0 (Windows desktop, May 2024), 2,346 pairwise outcomes.A compatible result means no reaction is predicted between two reactive groups, not that co-storage is approved. Predictions are pairwise: three or more substances together can react in ways this dataset cannot predict.
last updated 2026-07-15