Refractory Materials are usually non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F (811 K; 538 °C)。

Cenosphere




Chemical Properties
Silica -65%
Alumina 25%-35%
Iron Oxide l%-5%
Titania -1.5%

Physical 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

  Ceramics
Refractories, Castables, Ceramic Tiles, Fire Bricks, Aluminium Cement, Insulating

Materials, Coatings
  Plastics
BMC, SMC, Injection Moulding,Moulding, Extruding, PVC Flooring, Film, Nylon, High Density Polyethylene, Low Density Polyethylene, Polypropylene
  Construction Speciality Cements, Mortars, Grouts, Stucco, Roofing Materials, Acoustic Panels, Coatings, Shotcrete, Gunite
  Recreation Marine Craft, Flotation Devices, Bowling Balls, Surf Boards, Kayaks, GolfingEquipment, Footwear, Lawn & Garden Décor
  Composites, Undercoatings, Tyres, Engine Parts, Brake Pads, Trim Moulding, Body Fillers, Plastics, Sound Proofing Materials
  Energy & Technology Oil Well Cements, Drilling Muds, Industrial Coatings, Grinding Materials, Aerospace Coatings & Composites, Explosives, Propeller Blades

Cenospheres are hollow ceramic microspheres found in fly ash, a natural by-product of coal combustion during the generation of electric power. Small and hollow, micropheres are used as fillers or functional extenders in the manufacture of plastics, paints, resins; light weight aggregates for cement, ceramics and other construction products. Because cenospheres often replace mined materials, they can significantly lower production costs. Simultaneously, cenospheres can benefit finished product properties by increasing durability and better sound proofing. Too, as material recycled from flyash, cenospheres are environmentally friendly and help to preserve natural virgin fillers.

As a portion of the flyash generated in coal combustion, cenospheres are recycled from the waste stream. They are made up of inert silica, iron and alumina. Cenospheres have a size range from 1 to 300 microns with an average compressive strength of 3000+ psi.. Colors range from white to dark gray. They are also referred to as microspheres, hollow spheres, hollow ceramic microspheres, microballoons, or glass beads.

The spherical shape of cenospheres improves flowability in most applications and provides a more even distribution of the filler material. The natural properties of cenospheres make it possible to use them either in dry or wet slurry form. Cenospheres are easy to handle and provide a low surface area-to-volume ratio. Due to their inert properties, they are not affected by solvents, water, acids, or alkalis, cenospheres are 75% lighter than other minerals currently used as a filler or extender and are 30% lighter than

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