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 330°C, releasing water
• Exempt from REACH.

Basic properties

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

 

Product:

Product	Grade	D50 [µm]
Colemanite CA	7	2.5
	13	5

 

Production locations: Brassington (UK)

Functionality: Provides flame-retardancy along with good smoke suppression and char-formation, as a synergist in combination with ATH.