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The mainly advantages of using cenospheres including:
(1) Reduced Raw Materials Cost
(2) Improved Flowability
(3) Reduced Resin Demand
(4) Improved Insulation Values
(5) Reduced End Product Weight
(6) Resistant to Resin Absorption

Chemical Properties
  
Size 10-350 microns   
pH in Water 6.0-8.0   
Density 23-28 lbs. per cubic ft.   
Gravity 0.6-0.8   
Strength 3000 - 5000 lbs, per square in.   
Softening Point 1800 degrees F   
Shape Spherical   
Color Grey - Light Grey - Off White