Sodium Metasilicate Pentahydrate 1.7 lb / 770 gramsChemical Synthesis, Inorganic Salts, Sodium, Synthetic Reagents Caution! It is not something that should be handled without extreme care. We recommend having supervision and wearing appropriate protective (i.e. full arm gloves, eyewear, respirators, etc.) when using. This products needs to be kept Far away from children. Make sure you don’t have any allergies to the product and that you are using pure ingredients. Pregnant women should consult with a physician before handling.