Huntite/Hydromagnesite
Introduction:
Securoc C10 and Securoc D10 products are different blends of two minerals: Huntite and Hydromagnesite
Huntite particles have a platy morphology and the particles are usually about 1 μm or less in diameter, much smaller than hydromagnesite particles. It has the following chemical formula and thermally decomposes between about 450°C and 750°C in two stages, releasing only carbon dioxide, leaving a solid residue of magnesium oxide and calcium oxide: Mg3Ca(CO3)4 → 3MgO + CaO + 4CO2
The solid residue is called “char” and is critical to obtain smoke suppression . Char coming from Huntite has better mechanical properties than char generated by the thermal decomposition of hydromagnesite (which only consists of MgO – see below).
| Property | Value | Unit |
| Hardness (Mohs) | 1-2 | [-] |
| Refractive index | 1.62 | [-] |
| Density | 2.7 | [kg/ dm3] |
Natural hydromagnesite particles have a “blocky” morphology and once processed the majority of the particles are usually between 1 and 10 μm in diameter depending on the processing.
It thermally decomposes between about 220°C and 550°C in two stages, initially releasing water then carbon dioxide, leaving a solid residue of magnesium oxide: Mg5(CO3)4(OH)2·4H2O → 5MgO + 4CO2 + 5H2O
| Property | Value | Unit |
| Hardness (Mohs) | 3.5 | [-] |
| Refractive index | 1.54 | [-] |
| Density | 2.2 | [kg/ dm3] |
Basic product (mineral blend) properties
| Property | C10 | D10 | Unit |
| Moisture | 0.6 | 0.6 | [%] |
| pH | 10 | 10 | [-] |
| Hardness (Mohs) | 2 – 3 | 2-3 | [-] |
| Refractive index | 1.61 – 1.64 | 1.61-1.64 | [-] |
| Colour (D65/ 10°) L* | 98 | 98 | [-] |
| Ry | 93 | 93 | [-] |
| Density | 2.5 | 2.6 | [kg/dm3] |
Securoc products overview
| Product | Grade | D50
[µm] |
OA
[g/ 100 g] |
Surface treatment |
| Securoc | C10 | 4 | 45 | – |
| C10 F1 | 4 | 45 | 1 or 2% stearic acid | |
| D10 | 3.5 | 50 | ||
| D10 F1 | 3.5 | 50 | 1 or 2% stearic acid |
Production location: Lefkara (GR)
Functionality: Securoc C/D products provide flame-retardancy along with good smoke suppression and char-formation, either by itself or in combination with ATH.
Safety
