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]	Tappi [-]	OA [g/ 100 g]	pH [-]	Moisture [%]
HiFill N	1100	11.0	88.0	27.0	10.3	0.09
	800	7.6	88.7	30.0	10.4	0.10
	400	3.5	90.0	33.0	10.4	0.16
	300	2.6	90.5	35.0	10.5	0.18
	200	1.5	92.0	34	10.5	0.20

 

Production locations: Havelock, (CA)

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