High energy use and unstable batches make production costly. Anorthosite from Gudvangen brings balance, cleaner melts and consistent quality.
STONE WOOL
A Balanced Melt
Anorthosite from Gudvangen fits the mineral-wool melt perfectly. Its natural balance keeps the process stable and limits the need for additives.
STONE WOOL
Cleaner, Stronger Fibres
Low iron and titanium keep the melt bright and free from slag. The result is stronger, lighter insulation and longer furnace campaigns.
STONE WOOL
Consistent Production
Almost pure plagioclase means every batch behaves the same. Simpler batching, less dust and steadier fibre output.
STONE WOOL
Fewer Raw Materials to Manage
Almost pure plagioclase means every batch behaves the same. Simpler batching, less dust and steadier fibre output.
Property | Anorthosite | Basalt / Diabase | Limestone Mix |
|---|---|---|---|
Melting temperature | 1,350–1,450 °C | 1,450–1,550 °C | 1,400–1,500 °C |
Fe₂O₃ + TiO₂ content | Very low (≈ 0.5 %)* | High (6–12 %) | Low (1–3 %) |
Melt stability | Excellent, homogeneous | Variable | Moderate |
Additives required | Minimal | Limestone + bauxite | Silica + alumina |
Fibre colour / quality | Light – clean surface | Dark – slag risk | Grey – moderate |
Energy use | ≈ 5 % lower | Baseline | Similar to baseline |
Environmental impact | Low – electric mining, sea transport | High – quarrying, CO₂ | High – calcination CO₂ |
* Fe₂O₃ after on-site magnetic separation. Raw quarry stone averages 1.6 % Fe₂O₃.
FEATURES
Pure Composition. Proven Results.
Every benefit begins with the mineral itself. Pure, balanced and stable in every batch.
Gudvangen anorthosite contains about 48 % SiO₂, 30 % Al₂O₃ and 14 % CaO, a natural Ca–Al balance that stabilises viscosity and lowers melting temperature by 20–50 °C compared with basalt-based mixes.
Fe₂O₃ < 0.5 % after magnetic separation and TiO₂ < 0.2 % keep the melt bright and oxidation-free. The clean chemistry limits slag formation, extends filter life and maintains fibre strength and colour.
Composed of >90 % plagioclase feldspar with uniform crystal size, giving predictable behaviour in the furnace and steady fibre drawing from batch to batch.
The same Ca–Al–Si composition that stabilises melting also replaces separate limestone and alumina additions. Less handling, simpler batching and fewer dosing adjustments across the line.
Produced in controlled fractions, from ultra-fine powders to coarse aggregates, ensuring consistent quality and predictable performance for every industrial process.
Crushed and screened on-site and shipped directly from Gudvangen’s fjord terminal, reducing handling, contamination risk and emissions.
Get in Touch
Let’s Build Better Together
Talk to our team about how Gudvangen anorthosite can make your stone wool production cleaner, more efficient and more consistent.
