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| PREMIUM and FILTERCAKE are
hydrated aluminium silicates which have been specially prepared by a unique process to
accentuate such features as high brightness and fine particle size. A typical chemical analysis is:
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| Loss on Ignition | SiO² | Al²O³ | Fe²O³ | TiO² | CaO | MgO | K²O | Na²O |
| 13.8 | 50.4 | 35.5 | 0.25 | 0.05 | Trace | Trace | Trace | Trace |
| GRIT. . . . . . . . . . . . . . . . . . . . . . . . .
COLOUR. . . . . . . .
. . . . . . . . . . . . .
pH OF AQUEOUS SLURRY AT 20 PER CENT SOLIDS. . . . . . . . . . SPECIFIC GRAVITY . . . . . . . . . . . . FLUORIDE ION . . . . . . . . . . . . . . . CATION EXCHANGE
DISPERSIBILITY..........For ceramic applications the clay needs to be either ball milled or blunged under high shear.
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Less than 0.10 per cent on a 240 mesh BSS Screen for dispersed solution. Brightness typically 98.9 L* as measeured by a
Minolta CR300 Colorimeter using D65 Light source.
2.55 Less than 0.01% as F¯ (B.C.R.A.)
Approximately 20 m²/gm |
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| " Every precaution is taken in production to ensure the clays conform to the above data but as the products are based on naturally occuring raw materials, minor variations may occur." | ||