Imerys NYAD® G Wollastonite
Categories: Ceramic; Oxide; Silicon Oxide; Other Engineering Material; Additive/Filler for Polymer
Material Notes: High aspect ratio grade. This grade is recommended for polymer reinforcement.

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 PropertiesMetricEnglishComments
Bulk Density 0.400 g/cc0.0145 lb/in³Loose
 0.800 g/cc0.0289 lb/in³Tapped
Density 2.90 g/cc0.105 lb/in³
Brightness 82 %82 %G.E. Brightness
Oil Absorption 35 %35 %
Solubility in Water 0.0095 %0.0095 %
Moisture Absorption 0.0200 %0.0200 %
Particle Size >= 12 µm>= 12 µm10% smaller than
 55 µm55 µmmedian; Microtrac
 <= 200 µm<= 200 µm90% smaller than
pH 9.99.910% Slurry
Specific Surface Area 0.40 m²/g0.40 m²/gBET
Molecular Weight 116 g/mol116 g/mol
 
Mechanical PropertiesMetricEnglishComments
Hardness, Mohs 4.54.5
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 PropertiesMetricEnglishComments
Electrical Resistivity 1.30e+13 ohm-cm1.30e+13 ohm-cmpure 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 PropertiesMetricEnglishComments
CTE, linear 6.50 µm/m-°C3.61 µin/in-°F
Thermal Conductivity 2.63 - 2.77 W/m-K18.3 - 19.2 BTU-in/hr-ft²-°F
Melting Point 1410 °C2570 °FASTM D1857
 1540 °C2800 °Ftheoretical
 
Optical PropertiesMetricEnglishComments
Refractive Index 1.631.63
 
Component Elements PropertiesMetricEnglishComments
Al2O3 0.40 %0.40 %
CaO 46.36 %46.36 %
Fe2O3 0.77 %0.77 %
K2O 0.020 %0.020 %
Loss on Ignition(%) 0.50 %0.50 %
MgO 0.15 %0.15 %
MnO 0.15 %0.15 %
SiO2 51.6 %51.6 %
TiO2 0.050 %0.050 %
 
Descriptive Properties
Aspect Ratio (L/D)15:1
Bulking Value (gal./lbs.)0.0413
ColorWhite
Minus 100 U.S. Mesh Screen (%)99
MorphologyAcicular
Sedimentation (cm)42

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