Fused Silica

Hoben International has carried out an extensive global sourcing project and has located what it considers to be some of the highest quality refractories so far made available to investment foundries.

These include Fused Silica produced from quartz of exceptional purity with an SiO_² content of 99.9%. The source also has particularly low iron, potassium and sodium oxides and such a low trace element content to fall well within Aerospace specifications. Using our HIM plant in Derbyshire we are able to offer this product in a comprehensive range of flours and crushed and graded granular sizes.

CHEMICAL COMPOSITION
SiO₂	99.9%	Mn₃O₄	< 0.01%
TiO₂	< 0.01%	ZrO₂	< 0.02%
Al₂O₃	< 0.02%	HfO₂	< 0.01%
Fe₂O₃	< 0.01%	PbO	< 0.02%
CaO	< 0.01%	ZnO	< 0.01%
MgO	< 0.02%	BaO	< 0.01%
K₂O	< 0.01%	SrO	< 0.01%
Na₂O	< 0.03%	SnO₂	< 0.01%
P₂O₅	< 0.02%	CuO	< 0.01%
Cr₂O₃	< 0.01%
L.O.I. @ 1025ºC	0.10%
Sulphur Trioxide after L.O.I. and Fusion			0.05%