Wollastonite

close box The applications which
can use this mineral are
highlighted. Please select
one to learn more.
Product Description
Benefits & Application Details

Introduction

Wollastonite (calcium 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 Casiflux F/ FG Casiflux G Unit
Shape fibrous blocky
Moisture < 0.2 < 0.2 [%]
pH 10 10 [-]
Hardness (Mohs) 5 5 [-]
Refractive index 1.63 1.63 [-]
L.O.I. 3.5 3.5 [%]
Density 2.9 2.9 [kg/ dm3]

Casiflux is the product name for Sibelco’s wollastonite products.

  • Acicular grades are named Casiflux F or Casiflux FG
  • Granular grades are named Casiflux G 

 

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


Benefits:

Acicular

Reinforcement due to acicular shape e.g. improving impact resistance and Flex Strength of PP-resins. 

 

Abrasion resistance: due to its hardness of 5 on Mohs scale, wollastonite will increase wear resistance. 

 

Rheology control in e.g. sealants and adhesives: due to its acicular shape, wollastonite has an impact on the rheology profile. 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