Glossary / Physical hazards
Corrosive to metals
Corrosive to metals is a GHS physical hazard class for substances or mixtures that may materially damage or destroy metals through chemical action. It describes harm to equipment and containers, not harm to people.
Explanation
People often assume that corrosive means skin damage, and the same pictogram does cover both. The GHS keeps them as different hazard classes with different tests. Corrosive to metals is judged by how fast the chemical wears away steel or aluminum under test conditions, and the result is a single category.
Many strong acids, some bases and certain salt solutions can qualify. The consequence is practical: tanks, drums, pipework, shelving and fittings can fail, leak or weaken over time. A corroded shelf support or cabinet bottom can collapse under load, turning a slow problem into a spill.
Container choice is the main control. Use materials recommended by the supplier, such as certain plastics or lined containers, and do not decant into metal containers that are not rated for the product. Secondary containment made of compatible material guards against leaks from corrosion failures.
Inspect storage areas and containers regularly for rust stains, weeping seams, bulging or flaking paint. Fumes can also attack nearby metal fixtures, so a tightly closed container and ventilation help protect both people and equipment.
What to do and watch for
- Store in the container material recommended by the supplier.
- Use secondary containment that will not itself corrode.
- Inspect shelving, cabinets and drums for signs of corrosion.
Where it appears on an SDS
- Section 2: Hazard identification. The corrosive to metals classification, corrosion pictogram and hazard statement H290 (may be corrosive to metals).
- Section 7: Handling and storage. Safe storage details, including suitable and unsuitable container materials.
SDS content and wording vary by supplier. This page is general reference and does not replace the current SDS for your product.