Sodium metasilicate is a chemical substance that can be produced by the reaction of sodium hydroxide (caustic soda) with silicone dioxide (a main component of sand). It is the main component of commercial sodium silicate solutions, used in a wide range of industries, and usually appears as a white, readily-dissolvable powder. We use it in our dishwasher powder as an anti-corrosion agent and builder, to improve its cleaning properties. Sodium silicate is a known irritant if it comes into contact with the eyes or skin; we take care using this ingredient and direct contact is best avoided.
Other names: Na2O3Si, Disodium Silicate, Sodium Silicon Oxide; Silicic Acid, Disodium Salt