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.