Nepheline Syenite

Mineral:  Nepheline syenite (silicate, naturally occurring blend of albite, microcline and nepheline).

 

Nepheline syenite can be characterised by:

• High purity
• Absence free crystalline silica (free of labelling)
• Brightness
• Relatively low refractive index, making it a transparent filler in various binders
• High inertness in various media
• Easy wetting
• Transparency for UV-radiation (i.e. suitable for UV-curing processes)

 

Basic properties

Property	Value	Unit
Hardness (Mohs)	6	[-]
Refractive index	1.51 – 1.53	[-]
Density	2.6	[kg/ dm3]

 

Product overview Nepheline

Product	Grade	D50 [µm]	R457 [%]	OA [g/ 100 g]	pH [-]	Moisture [%]
Nepheline	S7 PO	4.3	85.4	23	10.4	0.2
	S10 PO	1.9	85.6	31	10.4	0.4

 

Production location: Stjernoy (NO)

Application

Advantage over quartz and cristobalite and certain feldspar grades: nepheline syenite grades are free of labelling, and can therefore be used as an alternative when labelled grades of other mineral fillers are no longer allowed or wanted.

Functionalities: Mechanical reinforcement, Durability