85% Undensified Microsilica (Silica Fume) 85U

85% Undensified Silica Fume is a high-quality, unprocessed microsilica containing more than 85.0% silica content. With a bulk density ranging from 250-350 kg/m3 and a specific surface area of 15-30 m2/g, it is an exceptional supplementary cementitious material with numerous advantages.

HSA Microsilica 85U offers several advantages in construction applications, including enhanced strength, improved durability, better workability, reduced thermal conductivity, environmentally friendly characteristics, and cost-effectiveness. It is widely utilized in insulation materials, large-scale concrete projects, mortar, pipe piles, and various other applications across the construction industry.

85% Undensified Silica Fume 85U
  • SiO2: >85%
  • Color: Grey
  • PH: 6~8
  • Bulk Density: 250~350kg/m3, 550~700kg/m3, Above 700kg/m3

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SiO2 (Silicon Dioxide, Amorphous)85% min
SO31.0% max
Cl0.3% max, typical 0.033%
Free CaO1.0% max, typical 0.92%
pH> 6
Moisture3% max
LOI (Loss on Ignition)6% max, typical 3.23%
Specific surface (BET)18 m2/gram min
Bulk Density250-350 kg/m3
PAI (Pozzolanic Activity Index) – 7 days accelerated curing105% min
Retained on 45 micron sieve10% max, typical 1.08%
Fluidity> 18 cm


  • 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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