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Sodium Alginates

Sodium Alginate Kelp
SNP offers different sodium alginate products depending on viscosity range, which fit into a variety of applications. We will consider the desired properties, along with the economics, to determine which series and/or viscosity range would be able to best suit your needs.

Series of Sodium Alginate

SNP carries two series of natural water soluble alginates: C series, and N series for different applications.


The C series are sodium alginate products for use in papermaking, paper coatings, textiles, printing and certain specialty industries. The C-Series consist of S-15-C, S-50-C, S-160-C, S-500-C, and S-1300- C. They range in viscosity from 15 to 900 cps in a 1% solution.

Applications for the C-Series

  • Provide excellent water retention
  • Reduced porosity for release grades
  • Improved binder flexibility
  • Improved pigment dispersion
  • Increased coating thixotropy
  • Both high resolution and high quality fine line printing


The N series was developed for use in the size press applications where high Gurley porosity values are needed. Products manufactured with the N-Series include postcard, OGWR (oil, grease and water resistant) and silicone release grades. These sodium alginates can be made at viscosities from 400-900 cps. This series contains S-500-N and S-1300-N products.

QD Series

SNP quick dispersing, QD, alginates, are designed for applications where tank agitation is insufficient to form a vortex at the time of alginate addition. QD alginates are treated through a proprietary process to prevent lumping without loss in beneficial alginate properties. These products find use in applications such as paper coatings for graphic art grades, size press coatings for coating hold-out, textile printing pastes and pigment dispersions and suspension. The benefits of QD are many: it disperses under low shear or without an eductor, disperses without lumping, eliminates gel-balls which lead to higher product efficiency, is low dusting and is available in a broad range of molecular weights. For more information on the grades of QD products offered, click here.

QS Series

SNP quick soluble, QS, alginates offer the benefit of quick hydration under normal shear conditions. Quick hydration is especially important to manufacturer’s seeking to increase coating throughput. QS alginates are designed to reduce time of hydration from 20 to 10 minutes. QS also readily disperses and wets out, is low dusting and is available in a broad range of molecular weights. These products are made using a proprietary process developed by SNP chemists and engineers. They find use in applications such as high speed blade coating applications, high through put coating make-down systems, automated coating and ink make-down systems. For more information on the grades of QS products offered, click here.