Nepheline Syenite

Mineral: Nepheline Syenite

 

Nepheline Syenite is used in sealants and adhesives.

Nepheline syenite can be characterised by:

• High purity
• Absence of 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]

 

Products:

Product	Grade	D50 [µm]	L*	OA [g/ 100 g]	Moisture [%]
Nepheline	AG20N	6	95	23	0.2
	S4	13	94	21	0.2
	S6	8	95	22	0.25
	S7	7	95	24	0.3
	S10	5	96	29	0.4

 

Production locations: Stjernoy (Norway) and Maastricht (Netherlands)

Application:

Nepheline syenite will improve the mechanical properties of the sealant/adhesives and can make its surface harder, thereby improving the durability

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