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Microfume® Refractories

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

Microfume® Refractories has a stable pH and a low impurity level and is perfectly adapted to the requirements of refractory castables. Its use improves the flow, the mechanical properties (especially hot strength), and durability (via permeability reduction).

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

Physical and Chemical Characteristics:

Analysis** Typical Min Limit Max Limit
SiO₂ (%) 96 94 98
Total C (%) 2.0 1.5 2.5
Free Si (%) 0.12 0.10 0.16
Total CaO (%) 0.68 0.50 1.50
SO₃ (%) 0.25 0.15 0.37
Na₂O (%) 0.18 0.10 0.25
K₂O (%) 0.45 0.35 0.60
CI (%) 0.015 < 0.01** 0.03
AI₂O₃ (%) < 0.1*** < 0.1*** 0.2
Fe₂O₃ (%) < 0.1*** < 0.1*** < 0.1***
MgO (%) 0.2 < 0.1*** 0.30
H₂O (%) 0.45 0.10 1
pH 6.5 6.3 6.7
Loss on ignition
(at 950C during 1h) (%)
1.8 1.0 3.0
Specific surface
(BET) (m²/g)
22.5 20 25
Bulk density
(kg/m³) undensified
150

Brightness L* 47 45 50

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


Packaging
Bulk in trucks or in 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
Low and Medium Cement Refractory Castables, vibrated or Self Consolidating Concretes (SCC).


Origin
France.


Quality Control
Complies with the ISO 9001 norm.


Environment
Complies with the ISO 14001 norm.


Safety
Complies with the OHSAS 18001 norm.