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Product Information - Specialty Grades (High Alumina)
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Introduction
Fillite is a glass hard, inert, hollow silicate sphere. Fillite is primarily used to reduce the weight of plastics,
rubbers, resins, cement, etc., but also imparts further benefits in many situations. Many of the advantages from the use
of Fillite, including increased filler loading and improved rheology, are directly attributed to the spherical nature of
the material.
Characteristics
- Lightweight
- Free-flowing
- Off-White in Colour
- Spherical
- Inert
Typical Applications
SGHA has a higher alumina content than the normal Fillite grades and has been specifically developed for higher temperature applications such as refractories, foundry applications, high temperature resistant coatings. Other higher alumina grades are whiter in colour and particularly suitable for gypsum board jointing compounds, veneering plasters, stuccos, sealants, coatings and cast resins.
Advantages
Reduced weight, increased filler loadings, better flow characteristics, less shrinkage and warping. Improved physical
properties in moldings, castings and laminates, reduced water absorption, improved flame retardance, improved chemical
resistance.
Chemical Properties
| Shell | Al2O3 | 34%-39% |
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| SiO2 | 55%-65% |
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| Fe2O3 | 2% maximum |
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| Gas | Carbon Dioxide | 70% |
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| Nitrogen | 30% |
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Physical Properties
| Average Particle Density | 0.7-0.9 g/cc (44lbs/ft3) |
| Average Bulk Density | 0.4-0.48 g/cc (25lbs/ft3) |
| Packing Factor | 60%-65% |
| Hardness | Mohs Scale 6 |
| Average Wall Thickness | 5%-10% Sphere Diameter |
| Melting Temperature | 1400°C (2250°F) |
| Thermal Conductivity | 0.11 Wm-1K-1 |
| Loss on Ignition | 2% maximum |
| Surface Moisture | 0.3% maximum |
| Crush Strength | 140-280 kg/cm2 (2000 - 4000 psi) |
Grades
| SGHA
(500HA) | 300W | 160W |
| Particle Size Range (microns) | 5-500 | 5-355 | 5-180 |
| Particle Size Distribution |
| % Passing 500 microns | 100 | 100 | 100 |
| % Passing 300 microns | 85-100 | 97-100 | 100 |
| % Passing 180 microns | -- | -- | 99.5-100 |
| % Passing 150 microns | 30-70 | 40-70 | -- |
| % Passing 100 microns | 10-30 | 10-30 | 30-60 |
| % Passing 50 microns | 2-10 | 2-10 | 10-20 |
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