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Sodium Metasilicates - Our products

High-quality silicates

Silmaco produces four standard types of high-quality silicates. You can also contact us for customized silicates. We work together with you to understand your expectations of the product and then go on to develop silicates that integrate seamlessly with your finished product and production process.

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Sodium Metasilicates

Sodium Metasilicates

Chemical formula
Na2O.xSiO2.yH2O (x=1 and y=0, 5 or 9)
Silmaco produces sodium metasilicate anhydrous, -pentahydrate and -nonahydrate. These grades differ in terms of concentration. As shown in the table below, a variety of grain sizes are available.
Packaging options
Bulk tankers, Big Bags, Bags of 25 kg

Product registration

EINICS number CAS number REACH registration number

Anhydrous: 6834-92-0

Pentahydrate: 10213-79-3

Nonahydrate: 13517-24-3



Product range

Grade Concentration (%) Grain Size Bulk density (g/L) Download MSDS
Anhydrous 97


1.100 MSDS-MET0-E
Pentahydrate 57


Nonahydrate 46 Medium 850 MSDS-MET9-E


Properties and advantages

  • Sodium metasilicate dissolves easily, even in cold water.

  • Our granules are characterized by a high bulk density and a low dust content.

  • As a highly alkaline product, sodium metasilicate will easily react with CO2. Our production methods are such that the risk of partial inactivity due to CO2 contamination is minimal as there is no contact between our products and the combustion gasses. This way, we can guarantee a pure sodium metasilicate.

  • The advantage with sodium metasilicate anhydrous is the high active content which makes it possible to formulate high concentrated products. Whereas sodium metasilicate pentahydrate and nonahydrate offers the benefit of a high dissolution speed.


Sodium Metasilicate: Green and Efficiƫnt

You can count on Silmaco to consistently deliver high-quality, a wide range of packaging options and excellent order fulfillment.