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Microfume® Concrete

Amorphous light grey silicon oxide powder, obtained by filtering the dust extracted from silicon and ferrosilicon production in an electric arc furnace.

Microfume® Concrete is widely used in concrete and fibre cement industries. In addition to its pozzolanic properties, Microfume® Concrete is also a very good filler due to its particle size. These combined properties lead to an extended life expectancy in aggressive environments (resistance to chlorides, acids and sulfates) and improved strength.

We are confident that we can satisfy your unique Microfume requirements. Just contact us to discuss them.

Microfume Concrete Physical and Chemical Characteristics:

Analysis** EN 13263-1,2 ASTM C1240 Typical Frequency
SiOâ‚‚ (%) Min. 85 Min. 85 92 – 96 Weekly
Free Si (%) Max. 0.4 0.14 Monthly
Free CaO (%) Max. 1.0 < 0.1*** Weekly
SO₃ (%) Max. 2.0 0.25 Weekly
Naâ‚‚O eq (%) To report To report 0.25 Weekly
CI (%) Max. 0.3 < 0.1 Monthly
Loss on ignition (%) Max. 4.0 Max. 6.0 2.0 Weekly
Specific surface
(BET) (m²/g)
15 – 35 Min. 15 < 25 Monthly
Pozzolanic Activity Index
Normal curing (28d)
Min. 100 110 Monthly
Pozzolanic Activity Index
Accelerated curing (7d)
Min. 105 120 Monthly
Bulk density
(kg/m³) undensified
To report 150 – 170 Daily
Bulk density
(kg/m³) semi-densified
To report 250 – 350 Daily
Bulk density
(kg/m³) densified
type DM
To report 350 – 550 Daily
Bulk density
(kg/m³) densified
type DP
To report 550 – 700 Daily
Hâ‚‚O (%) Max. 3.0 0.5 Weekly
> 45 µm (%) Max. 10.0 < 2 Weekly
pH 8
Brightness L* 45 – 65

** % by weight of dry mass *** Lower limit detection

Bulk in trucks or in big-bags. Other packaging on request.

Dry storage. Avoid contact with moisture.

Product totally amorphous. Material Safety Data Sheet available on request.

Mortars, Concretes: High and Very High Performance Concretes, Shotcretes. Refractory castles. Fibre cements.

France, South Africa, Spain, Venezuela and China.

Quality Control
Complies with the ISO 9001 and/or EN 13263-1,2 and/or ASTM C1240norms.

Complies with the ISO 14001 norm.

Complies with the OHSAS 18001 norm.