Imerys M1250 AS WOLLASTOCOAT® Wollastonite

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Imerys M1250 AS WOLLASTOCOAT® Wollastonite
Categories:	Ceramic; Oxide; Silicon Oxide; Other Engineering Material; Additive/Filler for Polymer
Material Notes:	Chemically treated grade. 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	Metric	English	Comments

Bulk Density	0.720 g/cc	0.0260 lb/in³	Loose
	0.910 g/cc	0.0329 lb/in³	Tapped
Density	2.90 g/cc	0.105 lb/in³
Brightness	89 %	89 %	G.E. Brightness
Oil Absorption	25 %	25 %
Solubility in Water	0.0095 %	0.0095 %
Moisture Absorption	0.120 %	0.120 %
Particle Size	>= 1.0 µm	>= 1.0 µm	10% smaller than
	4.0 µm	4.0 µm	median; Microtrac
	<= 13 µm	<= 13 µm	90% smaller than
pH	9.9	9.9	10% Slurry
Specific Surface Area	3.0 m²/g	3.0 m²/g	BET
Molecular Weight	116 g/mol	116 g/mol

Mechanical Properties	Metric	English	Comments
Hardness, Mohs	4.5	4.5
Tensile Strength	2700 - 4100 MPa @Diameter 0.00300 - 0.150 mm	392000 - 595000 psi @Diameter 0.000118 - 0.00591 in	Fiber Strength
Modulus of Elasticity	303 - 530 GPa @Diameter 0.00300 - 0.150 mm	43900 - 76900 ksi @Diameter 0.000118 - 0.00591 in	Fiber Modulus

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

Thermal Properties	Metric	English	Comments
CTE, linear	6.50 µm/m-°C	3.61 µin/in-°F
Thermal Conductivity	2.63 - 2.77 W/m-K	18.3 - 19.2 BTU-in/hr-ft²-°F
Melting Point	1410 °C	2570 °F	ASTM D1857
	1540 °C	2800 °F	theoretical

Optical Properties	Metric	English	Comments
Refractive Index	1.63	1.63

Component Elements Properties	Metric	English	Comments
Al2O3	0.30 %	0.30 %
CaO	44.94 %	44.94 %
Fe2O3	0.28 %	0.28 %
K2O	0.23 %	0.23 %
Loss on Ignition(%)	0.47 %	0.47 %
MgO	0.75 %	0.75 %
MnO	0.040 %	0.040 %
SiO2	52.94 %	52.94 %
TiO2	0.050 %	0.050 %

Descriptive Properties
Appearance	White
Bulking Value (gal./lbs.)	0.0413
Minus 400 U.S. Mesh Screen (%)	100
Morphology	Acicular

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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