Huntite
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Product Benefits
Technical Details
Huntite (magnesium calcium carbonate, Mg3Ca(CO3)4) is an ultrafine, lamellar mineral. Being sub-micron makes it suitable as an extender for TiO2. Huntite is available with a stearic acid surface treatment, changing its nature from hydrophilic to hydrophobic. Huntite can be characterised by:
- A high brightness
- Lamellar particle shape
- Sub-micron particle size.
Basic properties
| Property | H5 | H10 | Unit |
| Moisture | 0.6 | [%] | |
| pH | 10 | [-] | |
| Hardness (Mohs) | 2 – 3 | [-] | |
| Refractive index | 1.61 – 1.64 | [-] | |
| Colour (D65/ 10°) L* | 98 | – | [-] |
| Ry | – | 93 | [-] |
| Density | 2.7 | [kg/ dm3] |
Product overview
| Product | Grade | D50
[µm] |
OA
[g/ 100 g] |
Surface treatment |
| Portafill | H5 | 3 | 57 | – |
| H5 F11.0 | 3 | 57 | 1% stearic acid | |
| H5 F12.0 | 3 | 57 | 2% stearic acid | |
| H5 F13.0 | 3 | 57 | 3% stearic acid | |
| H10 | 3.5 | 50 | – |
Production location Portafill H
Portafill H is the brand name for Sibelco’s huntite products.
Benefits
- TiO2 extension: being an ultrafine, lamellar particle, huntite can be used to open up TiO2 agglomerates and to keep them separated during the drying/curing process. That way, TiO2 is more effectively used, which means less is needed to maintain the same properties – achieving a cost reduction.
- Rheology control: due to its lamellar shape and fairly high oil absorption compared to other mineral fillers, huntite has an impact on the rheology profile of the sealant and/or adhesive. When applying shear, the lamellar particles will align and provide a low viscosity. When shear is removed, the lamellar particles lose their orientation and cause the viscosity to increase above the level expected when the particles had a more regular shape.
