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Fillite Standard

Hollow Ceramic Microspheres

Oxide Weight866.99
Formula Weight866.99
If this formula is not unified correctly please contact us.
GSPT - Frit Softening Point 1300C

Fillite is a glass hard, inert, hollow silicate sphere. Fillite is primarily used to reduce the weight of plastics, rubbers, resins, cement, etc., but also imparts further benefits in many situations. Many of the advantages from the use of Fillite, including increased filler loading and improved rheology, are directly attributed to the spherical nature of the material.


Lightweight, free-flowing, spherical, inert.

Typical Applications

Refractories, PVC flooring, SBR latex carpet backing, brake linings, Phenolics, Epoxies, Cast Polyesters, synthetic marbles, syntactic foams, BMC, SMC and FRP, low density cements, shotcrete, and wallboard joint compounds, automotive sound-damping sheets.


Reduced weight, increased filler loading, better flow characteristics, less shrinkage and warping, improved physical properties in moldings, castings, and laminates, reduced water absorption, improved flame retardance, improved chemical resistance.

Physical Properties:

Average Particle Density 0.6-0.8 g/cc
Average Bulk Density 0.35-0.45 g/cc
Packing Factor 60-65%
Hardness Mohs Scale 5
Average Wall Thickness 5-10% sphere diameter
Melting Temperature: 1220-1350C
Thermal Conductivity: 0.11 Wm-K
Coefficient of Thermal Expansion - 8 x 10 -6 (K)
Surface Moisture 0.3% maximum
Crush Strength: 1500-3000 psi
Oil Absorption: 16-18 g oil/100g

Particle size varies with grades. Varies from 100% minus 100 microns to 20%.

Chemical Properties

Shell is 27-33% Al2O3, 55-65% SiO2, 4% maximum Fe2O3. Gas is 70% carbon dioxidate, 30% nitrogen.

Specialty High Alumina grades are also available.

This material does contain trace heavy metals, however they are bound into the glass structure.

Arsenic 10 ppm
Cadmium <0.1 ppm
Cobalt 2 ppm
Chromium 7 ppm
Copper 10 ppm
Mercury 0.5 ppm
Lead 5 ppm
Manganese 10 ppm
Nickel 5 ppm
Zinc 25 ppm
Selenium 0.5 ppm
Antimony n/a

Available from Trelleborg Fillite, Inc., 1856 Corporate Drive, Suite 135, Norcross, GA 30093-2925
Phone 770-729-8030

Out Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Fillite Standard" descrip="Hollow Ceramic Microspheres" searchkey="" loi="0.00" casnumber=""> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.500" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="1.500" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="5.000" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="1.000" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.000" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="31.000" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="55.000" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="5.000" tolerance=""/> </oxides> </material>

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