Colemanite is a borate mineral with the chemical formula Ca2B6O11·5H2O and is the main ore for Boron production.
It is characterised by:
- High purity
- Relatively low density of 2.42 g/cm3 compared to other mineral fillers, which are typically at 2.7 g/cm3
- Medium Mohs hardness of 4.5
- Decomposition around 240°C, releasing water
Production locations: Maastricht (NL), Brassington (UK)
Applications: Provides flame-retardancy along with good smoke suppression and char-formation, either by itself or in combination with ATH.