Do not assume that you will react or not react to a substance based on others' experience. Always use suitable precautions. Includes acids and bases, and can degrade steel at a steady rate. Examples include buffered chemical polish, sulfuric acid, sodium carbonate, regular mortar, and Drano. Many corrosive materials exhibit additional hazards.
Many corrosives are also water reactive.
To avoid a violent reaction and evolution of excessive heat when mixing two substances, slowly add the higher density substance to the lower density one, and stir continuously. Chemical Burns With any chemical burn, the tissue damage starts the instant the chemical agent contacts that tissue. The tissue destruction continues as long as the agent is present. Exposure to many corrosives is noticed shortly after contact. Exposure to HF does not produce a noticeable burn as do other strong acids.