Adhesive & Sealants / Adhesive & Sealants / Wollastonite

Wollastonite

Wollastonite (silicate, chemical formula CaSiO3) exists in an acicular and non-acicular form.

Wollastonite can be characterised by:

 

  • Shape (non-acicular/ acicular)
  • Medium Mohs hardness of 5
  • Alkaline nature.

 

Basic properties

Property F/ FG G Unit
Moisture < 0.2 0.2 [%]
pH 10 [-]
Hardness (Mohs) 5 [-]
Refractive index 1.63 [-]
L.O.I. 3.5 n.d. [%]
Density 2.9 [kg/ dm3]

Acicular

Non-acicular

 

 

Product overview

Product Grade D50

[µm]

OA

[g/ 100 g]

L*
Casiflux FG20 18 54 94
F75 28 59 90
G20 10.5 30 96
G38 18 28 96

 

Production locations Casiflux

 

Application

Wollastonite will provide:

 

  • Chemical resistance: wollastonite has a synergistic effect with dedicated anti-corrosive pigments, such as zinc phosphates.
  • Rheology control: due to its acicular shape, wollastonite has an impact on the rheology profile of the sealant and/or adhesive. When applying shear, the acicular particles will align and provide a low viscosity. When shear is removed, the acicular particles lose their orientation and cause the viscosity to increase above the level expected when the particles had a non-acicular shape.

 

Sibelco © 2020