Available in liquid and solid (prill) form, is used for passive fire protection.
It can be bought from online pyrotechnic stores and ceramic supply shops. It can be bought in either liquid form or a dry powder. When dry it is mixed with water and a small amount is placed around pass fire holes and exhaust holes (see hummer).
Sodium silicate is corrosive and may cause health problems with over exposure.
It is best to avoid eye and skin contact and vapour or mist inhalation.