Colemanite

Composition

2CaO∙3B₂O₃∙5H₂O

Portabor^®

Properties

• high boron content

Applications

Agro: ingredient of artificial fertilizers

Ceramics: makes glazes and frits suitable for production at low temperatures

Glass: to reduce the melting point without using alkalis

Portaflame^®

Properties

• has flame-retardant properties as a result of the endothermic decomposition and release of water vapour on heating of the mineral on the one hand and the formation of a protective layer during the oxidation process on the other
• endothermic decomposition at > 340 ºC
• natural product
• has smoke suppressant properties
• high boron content

Applications

Construction: bituminous roofing material: only as flame retardant or in combination with gibbsite