Building & Construction
Silmaco's Sodium and Lithium Silicates are used as sealers for concrete countertops. They react with the cement paste (calcium hydroxide) in concrete. The reaction generates additional cementing agents (calcium silicate hydrate) that physically increase the strength of the concrete surface and fill the pores to densify and decrease the porosity. They are therefore called densifiers. Lithium silicates have the advantange that they prevent blooming or efflorescence in this application.
Liquid or powder silicates can be added to cements to accelerate the set. Liquid silicates are used in shotcreting or gunning to provide immediate set. Powdered silicates are combined into dry cement admixtures and can be adjusted to modify the set time to meet your requirements.
Silmaco's Sodium Silicates are also used as low CO2-binder in alkali activated cement and geopolymer concrete.
Liquid and powdered silicates are utilised in manufacturing refractory and chemically-resistant bricks, mortars, and gunning mixes. Sodium silicate is added to the matrix as a binding agent and enhances the heat and acid resistant properties.
Silmaco's Sodium Metasilicates are especially used in oil well cements to prevent segregation of the solids from the high water containing cement matrix.
In the ceramic industry a part of the clay slurries is replaced by sodium silicate in order to decrease the amount of water, resulting in a much more efficient energy balance in the drying stage.
Sodium silicates are also used to seal porous ceramic materials.
Because of its absolutely inorganic compositon, Silmaco's Sodium Silicate and Sodium Metasilicate is especially suited for use in certain fire-resistant applications. The product is found in:
- Fire-resistant paints
- Refractory cements and pastes
- Applications where components must be protected against high temperatures
- Fire-resistant fillings, e.g. doors
Welding rods consist of a variety of mineral and metal powders bound together with sodium or potassium silicate. Silicates act as both a binder and a fluxing agent.
Specialised electrodes, e.g. for stainless steel, use complex mixed silicate systems containing sodium, potassium and even lithium.