Flammable Limits - The lowest and highest concentrations of vapor or gas in the air that will ignite when exposed to a spark of flame. When considering the explosion hazards, the LFL is the most important. The lower the LFL, the less of a substance needed in the air before it can ignite. Incompatible - Materials that could cause dangerous reactions from direct contact with one another. Oxidizer - A chemical other than blasting agent or explosive that contains oxygen and may start or assist combustion in other materials.
Examples are chromic acid, concentrated nitric acid, and potassium permanganate.
Strong acids have a pH near 1, strong bases near 13. A pH level of 7 indicates neutrality. The quantity of a product that will dissolve in water at room temperature. The term has important health consequences. The ratio of the weight of a product's known volume to the weight of an equal amount of water.