Norchem - the largest producer of silica fume products in North America

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Silica Fume Product Description

When added to precast and ready-mixed concrete, silica fume produces high-performance, high-strength concrete with an increased life-span and improved structural economics. Norchem silica fume is available in its as-produced, undensified form. For greater convenience, Norchem's densified silica fume, with twice the bulk density, provides many benefits. It is dustless, uniform, smooth, free of lumps and flows readily for bulk handling applications. Dry densified silica fume is the most economical product form for transportation, as its higher density allows bulk handling methods, and reduced shipping costs.


Prevents reinforcing steel corrosion in concrete, due to its extremely low permeability to chloride-ion intrusion and high electrical resistivity.

  • Greater impermeability, barring the ingress of moisture, chemicals and other contaminants
  • High early strengths, assuring increased efficiency and greater cost effectiveness in production of prestressed and precast concrete
  • High ultimate compressive strengths (8,000-20,000 psi), proportionate to amount of silica fume and the water-to-cementitious ratio
  • Substantially greater resistance to corrosion, abrasion and erosion, chemical attack and freeze/thaw damage


Norchem silica fume is ideal for use in structures exposed to chemical and environmental attack.

  • Parking garages
  • Bridge decks
  • Marine structures
  • Slabs
  • Roadways

In precast concrete (made in a manufacturing environment) it is more efficient, and results in cost and time savings.

  • High early and higher ultimate compressive strengths
  • Eliminates steam curing
  • Savings on heating costs and rapid turnover of forms

In shotcrete applications, there is less material waste and greater efficiency of product use.

  • High electrical resistivity and impermeability
  • Significantly less rebound loss
  • Mitigates reinforcing steel corrosion
  • Improved bonding strength
  • Thicker applications with each nozzle pass


Bulk silica fume can be stored in ordinary cement silos and transported in bulk bag or cement tankers. It can be moved into cement storage silos and then handled with normal automated batching systems. (Visit the Technical Information section for silica fume's MSDS.)


Densified silica fume can be shipped via pneumatic tankers holding 20 to 24 tons, or in bulk supersacks, 55 cubic foot polypropylene bags which hold approximately 2,000 pounds. Densified silica fume is also available in 25 pound "repulpable" paper bags and standard 50 pound bags.

Undensified silica fume can be shipped via pneumatic tankers holding 6 to 8 tons, or in bulk supersacks which hold approximately 1,300 pounds. It is also available in standard 50 pound paper bags.