Feldspar: a filler with a high degree of chemical resistance
With a proportion of almost 60 % by weight of the structure of the accessible earth's crust, feldspars are by far the most frequent group of minerals. Feldspar is a chemically resistant framework silicate with a thick-slated grain morphology. In our production facilities mainly potash feldspars are processed and separated by an elaborate screening technique, then classified and micro-ground.

Nepheline syenite: a quartz-free mineral
Nepheline syenite consists of feldspars and feldspar-type minerals such as albite, microcline and nepheline.

This mineral raw material contains no free crystalline Si0 2 . Nepheline syenite is inert and, exactly like feldspar, characterized by a high degree of hardness, i.e. 6, and a high degree of whiteness.

Features

• thick-slated structure

• hardness 6 (Mohs)

• density 2.6 g/cm³

• high degree of whiteness (Y-value > 90)

• high chemical resistance

• low refraction index of 1.53 - 1.55

• has a transparent behaviour in many binder systems

Key applications

• porcelain

• ceramics

• glass

• clear lacquer systems (among others UV-hardening lacquer systems)

• dispersion paints

• silicate- paints and plasters

• plastic films