Microsilica (Silica Fume)


Microsilica, also known as silica fume, is an ultrafine powder with high SiO2 content and high pozzolanic activity. It is used as a property-enhancing material in many areas, such as concrete construction, refractory, chemical fertilizer.

ACC has been manufacturing and supplying microsilica since 2005. Our densified (compacted), semi-densified, and undensified microsilica products are with minimum SiO2 contents ranging from 85% to 97%, which have been used in many famous projects around the world. ACC can also provide microsilica with higher SiO2 contents and specifications according to the requirements of customers.

ACC microsilica complies with ASTM C 1240 and EN13263:2005 standards and has been recognized by SGS, Exova, and other famous test authorities and ENR enterprises. The recycle, densifying and filling processes are automatically integrated in a closed environment without any mixture or impurities. We can fix clients’ orders in a stable production base so as to ensure the consistency and stability of quality.



Densified Silica Fume (Microsilica)

Densified Microsilica (Gray)

Good cost performance, commonly used in concrete applications.

SiO2 content: min. 85% – 97%

Bulk density: 500 – 700 kg/m3

DSF Series
Undensified Silica Fume (Microsilica)

Undensified Microsilica (Gray)

Good dispersion efficiency, for refractory, fertilizer, construction, etc.

SiO2 content: min. 85% – 96%

Bulk density: 180 – 450 kg/m3

USF Series
White Silica Fume (Microsilica)

White Microsilica

Excellent whiteness, with advantages of both silica and zirconia.

SiO2+ZrO2: min. 92% – 97%

High purity and fluidity.

ZSF Series


Silica Fume for Construction

For Construction

With high pozzolanic activity index, high comprehensive strength and low LOI, ACC microsilica can be well-performed in concrete applications, which can improve the bond strength and abrasion resistance, reduce permeability, and protect reinforcing steel from corrosion.

Silica Fume for Refractory

For Refractory

ACC undensified microsilica can be well used in the refractory application. It can improve the fluidity of refractory casting materials, reduce water consumption, improve the compactness, temperature strength and thermal shock resistance.

Learn more about the effect of microsilica on refractory castables.

Silica Fume for Fertilizer

For Fertilizer

ACC microsilica can also be well-performed in fertilizer, it can be used as moisture absorption, anti-caking agent, and pellet binding agent.etc.

Brochure & Datasheets

ACC Microsilica Brochure Download
Densified Microsilica (from light to dark gray)
Undensified Microsilica (from light to dark gray)
White Microsilica

ACC microsilica is supplied in a range of packagings:

  • Jumbo bag with PE liner which conforms to GB/T10454 and EN ISO 21898 with uv-proof function and anti-aging character;
  • 20kg/25kg plastic woven bag with PE liner;
  • 10kg/12kg water-soluble paper bag;
  • Special packaging can be supplied on request.

ACC sets up thousands of square meters of warehouses in main ports of China, which ensures timely shipment for urgent needs from clients. ACC also provides integral solutions of transportation for customers:

  • Containerized shipment
  • Break-bulk shipment

Note: There are break bulk vessels to main ports of the Middle East (say Jebel Ali, Hamad, Kuwait, etc.) every month.

ACC Microsilica (Silica Fume) Storage and Transportation


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