Typical Property Data for
Sodium Metasilicate, pentahydrates
Sodium Metasilicate, pentahydrate is a free-flowing water-soluble beaded
powder form of metasilicate (silica (SiO2)-to-soda (Na2O) ratio of 1).
Sodium Metasilicates are manufactured from sodium silicate glass, which
is produced in furnaces by melting high purity sand with soda ash.
Sodium Metasilicate is mainly used for industrial
cleaning and detergent applications.
Sodium Metasilicate, pentahydrate is characterized by the property data shown
below. The properties and ranges shown are typical values, not manufacturing specifications. Physical properties are measured at 20o
Typical Property Data METSO PENTABEAD® 20
Sodium Metasilicate Pentahydrate
Wt % Na2O (±1.0) 29.3
Wt % SiO2 (±1.4) 28.4
Wt% H2O (±0.5) 41.75
Density, lb/ft3 (g/cm3) 55 (0.88)
Particle Size, Tyler 94% in 16 to 48 mesh
Melting Point, oF (
oC) 162 (72)
Rate of Solution in Water, sec 35
Appearance of Solution Clear
Sodium metasilicates, METSO BEADS® 2048 and METSO PENTABEAD®20, offer the convenience of sodium silicate and sodium hydroxide (caustic soda) in an easy to handle, free-flowing bead. Available in both anhydrous and pentahydrate, sodium metasilicates are the workhorse ingredients in detergents and cleaning products. The metal cleaning, industrial and institutional cleaners, textile and food processing industries all utilize metasilicates for the superior physical and chemical properties. They are also used to manufacture specialty cements used in the drilling industry.
Applications of Sodium Metasilicate
Sodium metasilicate is used in fireproofing mixtures; in laundry, dairy, metal, and floor cleaning; in deinking paper; in washing carbonated drink bottles; in insecticides, fungicides, and antimicrobial compounds; as a chemical intermediate for silica gel catalysts; as an additive in soaps and synthetic detergents; as an ingredient in adhesives; as a bleaching aid; and as a boiler compound. Combined with other salts such as sodium bicarbonate, it can be applied to aluminum as a paint stripper. In field experiments, compounds composed of sodium metasilicate, an alkali metal carbonate, and a preservative have been used as desiccants for forage crops. Sodium silicate solutions, reacted with solutions of many soluble salts to form complex gelatinous precipitates, have been used in soil stabilization. The pentahydrate form is considered generally recognized as safe (GRAS) by the Food and Drug Administration (FDA) for use in washing mixtures for fruits and vegetables, in sanitizing solutions for food-contact surfaces, in boiler water, as a denuding agent for tripe, as a hog scald agent for the removal of hair, and as a cooling and retort water agent for the prevention of staining of the outside surfaces of canned goods. Sodium metasilicate is also regulated by the Environmental Protection Agency (EPA). It has been Reregistration Eligibility Decision (RED) approved.
Sodium Metasilicate reacts with acids to produce silica gel.
· Cements and Binders – dehydrated sodium metasilicate forms cement or binding agent.
· Pulp and Par – sizing agent and buffer/stabilizing agent when mixed with hydrogen peroxide.
· Soaps and Detergents – as an emulsifying and suspension agent.
· Automotive applications – decommissioning of old engines (CARS program), cooling system sealant, exhaust repair.
· Egg Preservative – seals eggs increasing shelf life.
- Binding agent
- Stabilizing agent
- Emulsifying agent
- Egg preservative
· Crafts – forms “stalagmites” by reacting with and precipitating metal ions. Also used as a glue called “soluble glass“.
SODIUM METASILICATE PENTAHYDRATE
Sodium Silicate Hydrate
Sodium Metasilicate is formed by the high temperature fusion of sodium carbonate and silicon dioxide. Sodium Metasilicate forms highly alkaline solutions when dissolved in water. It is commonly used as a component of cleaners such as dishwasher detergent and laundry detergent.
The industrial name of it is water glass. It is extensively used in the manufacturing of Detergents, Silica Gel, Card-board, Paper, Textiles, Paints, Adhesives, Pottery, Sanitaryware, Refractories, Foundry and Wood Processing Industries because of it’s very good binding, adhesive, bleaching and sizing properties respectively. It is also used as electrolyte in keeping fine particles in suspension (of water) without allowing them to settle down.
SODIUM METASILICATE PENTAHYDRATE SPECIFICATION
- Other Names: Silicic acid disodium salt pentahydrate, Disodium silicate pentahydrate, Sodium silicate hydrate, Disodium trioxosilicate
- Appearance: Colorless or white crystal
- Odour: Odourless
- Melting Point: 72.2 oC
- Specific Gravity: 0.7 ~ 1.0 g/ cm3
- PH: Basic
- Solubility: 610g/ l in water (@ 30oC)
- CAS NO: 10213-79-3
- Molecular formula: Na2SiO3 5H2O
- Molecular weight: 212.13
- Degree of Whiteness: 75.0 % Min
- PH Value(1 % at 20): 12.4-12.6
It is considered to be safer to use than sodium hydroxide (caustic soda) and does not attack metals including aluminium as aggressively as caustic. It moderates the tendency of the alkali to corrode and dissolve metals. Sodium silicate reacts with metal oxides to form a protective film on metal surfaces. This film is maintained as long as small amounts of soluble silica remain in the presence of water.
When used in conjunction with surfactants / detergents sodium metasilicate aids 1. The neutralization of acidic soil 2. The emulsification of oily and greasy soil 3. The deflocculation of particulate soil 4. The suspension of removed soil and prevention of it’s redeposition.
Sodium metasilicate disperses grease and dirt deposits into small suspended particles that rinse away without redepositing on freshly washed surfaces
SODIUM METASILICATE PENTAHYDRATE APPLICATION
A major use is as a builder (a material that enhances or maintains the cleaning efficiency of the surfactant, principally by inactivating water hardness) in soaps and detergents. Mainly used in making high efficiency detergents and metal cleaners. As a substitute for STPP, it can increase cleaning efficiency and reduce environment pollution, it provides excellent alkaline buffering, corrosion prevention for metal (i.e. Zinc, Aluminum), and aids in the of softening water. Used to improve washing detergents and metal cleaners.
It is also used extensively as an anti-corrosion agent in boiler-water feed.
Sodium metasilicate is used in fireproofing mixtures; in laundry, dairy, metal, and floor cleaning; in deinking paper; in washing carbonated drink bottles; in insecticides, fungicides, and antimicrobial compounds; as a chemical intermediate for silica gel catalysts; as an ingredient in adhesives; as a bleaching aid to stabilise hydrogen peroxide; as a clay deflocculant in the cermics industry, and as a boiler compound. Combined with other salts such as sodium bicarbonate, it can be applied to aluminum as a paint stripper.
Health & Safety
R38- Irritating to skin. R41- Risk of serious damage to eyes.
PLEASE NOTE: This product is not for human or animal consumption.