ALTIFIL™
ALTIFIL™ products have controlled particle sizing, low iron content, low thermal expansion, low shrinkage, low thermal conductivity, and high thermal shock resistance. They also have great reheat stability and permanent expansion, and have very low levels of impurities. ALTIFIL™ also has low apparent porosity and is resistant to alkali vapor penetration.
While pyrophyllite has similar physical properties to talc and is interchangeable in many industrial applications, pyrophyllite exhibits unique and favorable thermal properties in refractory, foundry and insulating applications. ALTIFIL™ products experience a series of solid-state phase transformations during thermal treatment. Dehydroxylation of pyrophyllite is completed at 880°C, and the original layered framework is inherited in dehydroxylated pyrophyllite. Up to 1100°C, the layered framework is collapsed thoroughly, with formation of amorphous SiO2 and mullite. Also, compared to a kaolin clay that exhibits a crystal structure of 1:1 layering, pyrophyllite exhibits a 2:1 layering crystal structure, which provides a smoother transition phase during thermal exposure.
In fiberglass applications, ALTIFIL™ products improve furnace operations, featuring low iron content, reduced LOI (compared to kaolin/silica mix), and low alkali. ALTIFIL™ reduces energy consumption, increases glass yield, improves batch-to-melt conversion efficiency, and eliminates the need for sand in batches.
In cement, ALTIFIL™ products are coarse aluminum silicates with high dry brightness, low iron content and low overall impurities.
Median particle sizing typically ranges from 45-micron to 1200-micron to suit various applications. Al2O3 concentrations range from 14-19%.
Markets:
- Ceramics
- Insulation Firebrick
- Aluminum-silica Monolithic Refractories
- Ramming and Gunning Castables
- Kiln Car Refractories
- Taphole Clays
- Foundry Washes
- Ceramic Foundry Filters
- Fiberglass
- Construction
- Road Paint
- Stucco
- Extender for Natural and Synthetic Rubber
- Cement
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Pyrophyllite
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