Undensified Microsilica (Silica Fume) Grade 92U

Undensified Microsilica (Silica Fume), SiO2 92% min

Undensified Microsilica with Minimum SiO2 Content 92%

  • High SiO2 content.
  • High Pozzolanic Active Index.
  • High Compresive Strength.
SiO2 (Silicon Dioxide, Amorphous)92% min
SO31.9% max, typical 0.26%
Cl0.3% max
Free CaO1.0% max
Al2O3Typical 0.75%
K2OTypical 1.17%
MgOTypical 0.42%
Na2O0.02% max
Fe2O3Typical 0.19%
Moisture3% max, typical 0.65%
LOI (Loss on Ignition)6% max, typical 3.13%
Specific surface (BET)18 m2/gram min
Bulk Density300-450 kg/m3
PAI (Pozzolanic Activity Index) – 7 days accelerated curing105% min
Retained on 45 micron sieve10% max, typical 1.01%
Fluidity> 15 cm


ACC® Microsilica Grade 92U conforms to the mandatory requirements of the relevant standards from:

  • American Society for Testing and Materials (ASTM C 1240).
  • European Committee for Standardisation.

Quality Control

ACC® Microsilica is certified according to ISO 9001.

The chemical composition and physical properties are regularly tested in accordance with international standards.


The product is supplied in a range of packaging:

  • 500kg double plastic woven jumbo bag.
  • 20/25kg woven bags with PE liner.
  • Special packaging can be supplied on request.


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