Uneven melts and slag formation raise costs and weaken the fibre. Gudvangen anorthosite keeps the process stable — for cleaner melts and consistent strength.
FIBER GLASS
Greater Clarity and Strength
Low iron and titanium keep the melt pure and stable, giving higher tensile strength and longer filament life.
FIBER GLASS
Smoother Drawing
Balanced chemistry ensures even viscosity and steady flow — fewer strand breaks, cleaner winding.
FIBER GLASS
Consistent Output
Uniform mineral structure keeps every melt identical, improving yield and process control.
FIBER GLASS
Lower Energy Use
Gudvangen anorthosite melts faster and at lower temperature, cutting power consumption and extending furnace life.
Property / Parameter | Anorthosite (Gudvangen) | Feldspar | Basalt |
|---|---|---|---|
Main Function | Source of Al₂O₃, CaO, SiO₂ | Al₂O₃ + alkalis | SiO₂ + FeO + MgO |
Melting Temperature | 1 350–1 400 °C | 1 400–1 450 °C | 1 450–1 550 °C |
Fe₂O₃ + TiO₂ | Very low (≈ 0.5 %)* | 1–2 % | 6–10 % |
Viscosity Stability | Excellent — balanced Ca–Al–Si ratio | Moderate | Poor — Mg/Fe sensitive |
Fibre Strength / Colour | High, bright fibres | Good | Lower, dark fibres |
Additives Required | Minimal | Needs Ca-source | Needs Al-source |
Energy Demand | ≈ 3–5 % lower | Baseline | Higher |
Environmental Impact | Low — electric mining, sea transport | Moderate — quarrying | High — quarry + CO₂ |
* Fe₂O₃ after on-site magnetic separation.
FEATURES
Strength Built on Stability.
Behind every high-performance fibre is a melt that flows evenly and cools cleanly
— powered by Gudvangen anorthosite.
Gudvangen anorthosite contains approx. 50 % SiO₂, 30 % Al₂O₃ and 14 % CaO — a natural balance that supports stable viscosity and promotes filament continuity.
e₂O₃ averages ~0.5 % after magnetic separation and TiO₂ <0.3 %. These low levels help limit oxidation and colour shifts, protecting fibre strength and furnace refractories.
With over 90 % plagioclase feldspar and consistent grain size, the mineral delivers repeatable melting behaviour and steady fibre drawing.
A lower fusion onset (≈1 350 °C) means the melt can form at reduced energy input, and the stable chemistry limits thermal cycling and extends furnace lining life.
Produced in controlled fractions — from ultra-fine powders to coarse aggregates — ensuring consistent quality and predictable performance for every industrial process.
The Gudvangen site connects directly to deep-water shipping routes, providing efficient, low-emission bulk transport to industry across Europe.
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Discover how stable chemistry and lower energy use can improve your glass production.
