E & E / Cable Jacket CR/PVC / Colemanite


Mineral: Colemanite


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


Basic properties

Property Value Unit
Hardness (Mohs) 4.5 [-]
Refractive index 1.61 [-]
Density 2.42 [kg/ dm3]



Product Grade D50


Colemanite CA 7 2.5
12 5


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. 

Functionality: Safety

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