Calcined product based on Sillitin Z 86.
Silfit Z 91 offers highest brightness and color neutrality.
- high chemical and acid resistance
- good mechanical properties (high strength)
- high color neutrality
- adjustable rheology through selection of product (additives can be reduced)
- also suitable for food contact and drinking water applications (as per FDA and BfR regulations)
| Product characteristics | Unit | Testing method | SILFIT Z 91 |
|---|---|---|---|
| Functionalization | untreated | ||
|
Color values L*
Color values a*
Color values b*
|
acc. to CIELAB |
96.5
- 0.2
1.0
|
|
|
Particle size D50
Particle size D97
|
µm | acc. to ISO 13320-1 |
2.1
9,5
|
|
Residue > 40 µm
|
mg/kg | acc. to DIN EN ISO 787 part 18 |
10
|
| Volatile matter at 105 °C | % | acc. to DIN EN ISO 787 part 2 | 0.2 |
| Electrical conductivity | µS/cm | acc. to DIN EN ISO 787 part 14 | 20 |
| pH Value | acc. to DIN EN ISO 787 part 9 | 6.5 | |
|
Density
Bulk density
Tamped density
|
g/cm³ |
acc. to DIN EN ISO 787 part 10
acc. to DIN ISO 903-1976
acc. to DIN EN ISO 787 part 11
|
2.6
0.30
0.55
|
|
Spec. Surface area (BET)
Oil absorption
|
m²/g
g/100 g
|
acc. to DIN ISO 9277
acc. to DIN EN ISO 787 part 5
|
10
65
|
|
Hardness silica/kaolinite
|
mg |
acc. to Mohs
|
7/4.5
|
| Refractive index n | sin α / sin β | 1.55 | |
|
Water solubility
Acid solubility
|
% |
acc. to DIN EN ISO 787 part 3
acc. to DIN 53770 (0,1 N HCL)
|
< 0.5
< 1
|
|
Chemical Analysis:
SiO2
Al2O3
Fe2O3
|
% | acc. to DIN 51001 (RFA) |
86
13
< 1
|
|
Mineralogical Composition:
Neuburg silica
Calcined kaolinite
|
% | Based on X-ray diffraction pattern analysis combined with Rietveld |
60
40
|
|
Equilibrium moisture content at 25°C
and 50% relative humidity
and 80% relative humidity
and 90% relative humidity
|
% | acc. to DIN 66138 |
0.12
0.22
0.54
|
| Water absorption | ml/g | acc. to Baumann | not specified |
