96% Undensified Microsilica (Silica Fume) 96U

96% Undensified Silica Fume, also known as Microsilica or Condensed Silica Fume, is an ultrafine, amorphous silica byproduct generated during the production of silicon and ferrosilicon alloys. This highly reactive pozzolan is characterized by its high silica content (96%), low bulk density (250-350 kg/m³), and extensive specific surface area (15,000-30,000 m²/kg).

The remarkable properties of 96% Undensified Silica Fume can be attributed to its ultrafine particle size, high purity, and vast specific surface area. These features enable it to fill microscopic voids within the concrete matrix, thereby improving the overall density, strength, and durability of the material.

96% Undensified Silica Fume 96U
  • SiO2: >96%
  • Color: Dark grey, Grey
  • PH: 6~8
  • Bulk Density: 250~350kg/m3, 550~700kg/m3, Above 700kg/m3

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96% Undensified Silica Fume is extensively used in the construction industry to enhance the performance of concrete and cementitious materials. Some of its key applications include:

  • High-strength concrete: Its use in concrete mixtures results in improved compressive and flexural strength, making it suitable for constructing high-rise buildings, bridges, and other infrastructure projects.
  • Durable concrete: The incorporation of silica fume in concrete mixtures enhances resistance against chemical attack, abrasion, and freeze-thaw cycles, making it ideal for use in harsh environments and structures with long service life requirements.
  • Shotcrete and refractory materials: Due to its ability to improve bonding and cohesion, silica fume is widely used in shotcrete applications for tunnel linings, slope stabilization, and refractory materials.
  • Specialty applications: Silica fume is also utilized in various specialty applications, such as oil well cementing, grouts for pre-stressed concrete, and self-compacting concrete.


SiO2 (Silicon Dioxide, Amorphous)96% min
Al2O3 (Aluminum Oxide)Typical 0.39%
Fe2O3 (Iron Oxide)Typical 0.067%
CaO (Calcium Oxide)Typical 0.31%
MgO (Magnesium Oxide)Typical 0.38%
K2O (Potassium Oxide)Typical 0.85%
Na2O (Sodium Oxide)Typical 0.23%
LOI (Loss on Ignition)4 % max
Moisture3% max, Typical 0.51%
Retained on 45 micron sieve10% max, Typical 1.01%
Bulk Density250-350 kg/m3
Fluidity> 18 cm
Specific surface (BET)18 m2/gram min


  • 10kg soluble paper bags x 84 on the pallets.
  • 20kg soluble paper bags x 42 on the pallets.
  • 950kg plastic woven bags x 2 on the pallets(with or without bottom spout)
  • 1000kg plastic woven bags x 2 on the pallets(with or without bottom spout )
  • 500kg plastic woven bags x 2 on the pallets (with or without bottom spout )
  • United States – ASTM C1240
  • Canada – CSA A23.5
  • European Union – EN 13263
  • China – GB/T 18736
  • Japan – JIS A 6207
  • Brazil – ABNT NBR 13956
  • Korea – KS F 2567
  • Vietnam – TCVN 9395
  • India – IS 15388

The cost of the silica fume is influenced by multiple factors, such as SiO2 content, logistics transportation cost, labor cost, ect. Generally, the price of silica fume ranges from $150 to $800 per metric ton. However, prices can sometimes exceed this range for high-quality, specialized products or for small orders.Due to different needs, which means that the price is changed, so we are unable to provide online quotes. We will send you the detailed quotation after you send us your requirements.

Silica fume and fly ash are both supplementary cementitious materials that can improve the performance of concrete. Silica fume is composed of extremely fine particles of amorphous silica, while fly ash is a byproduct of coal combustion and composed of small spherical particles of inorganic material. Silica fume particles are much smaller than fly ash particles, and it is generally considered to be a more reactive pozzolan than fly ash. Silica fume is known for improving the compressive strength of concrete at early ages, while fly ash is typically used to improve the long-term strength and durability of concrete. The choice of which material to use will depend on the specific application and performance requirements of the concrete being used.

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Founded in 2001, HSA is a leading provider of Silica Fume and Abrasives in China, and also the premium source of high-performance Products for concrete and abrasives industries.

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