Imerys NYAD G® WOLLASTOCOAT® Wollastonite

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Imerys NYAD G® WOLLASTOCOAT® Wollastonite
Categories:	Ceramic; Oxide; Silicon Oxide; Other Engineering Material; Additive/Filler for Polymer
Material Notes:	Wollastonite is a naturally occurring white mineral with an acicular (needle-shaped) particle structure. This distinctive particle morphology makes wollastonite an ideal performance mineral for a broad range of industrial and consumer applications, including polymer reinforcement; coatings; construction/architecture reinforcement; enhancing friction stability in discs, lings, and brakes; and metallurgy. .Information provided by NYCO Minerals, subsequently acquired by Imerys.
Key Words:	Calcium Metasilicate, CaSiO₃, CaSiO3
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Physical Properties	Original Value	Comments

Bulk Density	0.800 g/cc	Loose
	1.12 g/cc	Tapped
Density	181 lb/ft³
Brightness	81 %	G.E. Brightness
Oil Absorption	31 %
Solubility in Water	0.0095 %
Moisture Absorption	0.0200 %
Particle Size	>= 11 µm	10% smaller than
	50 µm	median; Microtrac
	<= 200 µm	90% smaller than
pH	9.9	10% Slurry
Specific Surface Area	0.50 m²/g	BET
Molecular Weight	116 g/mol

Mechanical Properties	Original Value	Comments
Hardness, Mohs	4.5
Tensile Strength	2700 - 4100 MPa @Diameter 0.00300 - 0.150 mm	Fiber Strength
Modulus of Elasticity	303 - 530 GPa @Diameter 0.00300 - 0.150 mm	Fiber Modulus

Electrical Properties	Original Value	Comments
Electrical Resistivity	1.30e+13 ohm-cm	pure wollastonite
Dielectric Constant	6.8 @Frequency 10000 Hz
	6.8 @Frequency 100000 Hz
	6.9 @Frequency 1e+6 Hz
	6.9 @Frequency 1000 Hz
Dissipation Factor	0.00152 @Frequency 1000 Hz
	0.0046 @Frequency 10000 Hz
	0.0046 @Frequency 1e+6 Hz
	0.0078 @Frequency 100000 Hz

Thermal Properties	Original Value	Comments
CTE, linear	6.50 µm/m-°C
Thermal Conductivity	2.63 - 2.77 W/m-K
Melting Point	1410 °C	ASTM D1857
	1540 °C	theoretical

Optical Properties	Original Value	Comments
Refractive Index	1.63

Component Elements Properties	Original Value	Comments
Al2O3	0.40 %
CaO	46.36 %
Fe2O3	0.77 %
K2O	0.020 %
Loss on Ignition(%)	0.50 %
MgO	0.15 %
MnO	0.15 %
SiO2	51.6 %
TiO2	0.050 %

Descriptive Properties
Appearance	White
Bulking Value (gal./lbs.)	0.0413
Minus 100 U.S. Mesh Screen (%)	99
Morphology	Acicular

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