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Microfume® White

Amorphous white silicon oxide powder, obtained by filtering the dust extracted from silicon metal production in an electric arc furnace.

Microfume® White has a high SiO₂ content and very low impurity levels. Its use in refractory castables and High/Very High Performance Concrete improve their mechanical properties and their durability.

Its stability to temperatures of 1200°C and its good sintering properties make it a raw material perfectly adapted for ceramics and refractory castables. Its white colour enables its use in aesthetical and decorative civil engineering work.

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

Microfume White Physical and Chemical Characteristics:

Analysis** Typical Min Limit Max Limit
SiO₂ (%) 97.5 96.5 98.5
Total C (%) 0.35 0.10 0.70
Free Si (%) 0.35 0.10 0.60
Na₂O (%) 0.08 0.04 0.12
K₂O (%) 0.11 0.06 0.18
AI₂O₃ (%) 0.10 < 0.10*** 0.3
Total CaO (%) 0.35 0.25 0.55
Fe₂O₃ (%) 0.20 0.10 0.35
MgO (%) 0.15 < 0.10*** 0.20
SO₃ (%) 0.06 0.03 0.10
CI (%) < 0.01*** < 0.01*** < 0.01***
H₂O (%) 0.30 0.11 0.40
pH 7.0 6.7 7.5
Loss on ignition
(at 950C during 1h) (%)
0.60 0.30 1.0
Specific surface
(BET) (m²/g)
25 20 28
Bulk density
(kg/m³) undensified
150

Bulk density
(kg/m³) densified
380 340 420
> 45 µm (%) 0.6 0.1 1.5
Brightness L* 70 65 75

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


Packaging
Big-bags. Other packaging on request.


Storage
Dry storage. Avoid contact with moisture.


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


Applications
Refractory castables. High and Very High Performance Concretes. Ceramics.


Origin
France.


Quality Control
Complies with the ISO 9001 norm.


Environment
Complies with the ISO 14001 norm.


Safety
Complies with the OHSAS 18001 norm.