Cenosphere (Expanded Mineral Materials Containing Alumina and Silica) are a by-product of coal burning power plants and are lightweight, inert, hollow sphere filled With air or inert gas. the colour of Cenosphere varies from grey to almost white and their density is about 0.4 – 0.8 g/cm3 (0.014 – 0.029 lb./cu in), which provides them with buoyancy.

Cenosphere behaves like tiny ball bearings to improve workability, flow under pressure, reduce shrinkage, enhance isotropic properties and reduce resin, binder or water demand due to their low oil absorption level and high packing factor. Physically, Cenosphere is hard, rigid, light, waterproof, innoxious, and insulative. By utilizing these characteristics of Cenosphere it is possible to produce materials with excellent heat insulating properties.. Cenosphere combine all the advantages of spherical shape with the additional benefits of low density at an economic cost. with low densities Cenosphere reduces the weight of formulated products.

Characteristics of Cenosphere

The Unique Features Of FILLIT

5~300 um particle size, Grey or Light Grey colour hollow sphere with compressed gas

Low density (0.60-0.70 g/cc) free-flowing filler material

High strength in compressing [105-210 kg/cm2 (2000 - 4800 psi)

Inert, sound and thermal insulation

Heat resistant (1500 °C)

Less shrinkage and warpage and water absorption

Buoyancy, flame retardance, chemical resistance

According To Size According To Density
FILLIT 300 D -
FILLIT 500 D -
Cenosphere- FILLIT

We have developed Cenosphere of different qualities under our brand name FILLIT. In current era, FILLIT is the World's No. 1 light weight high performance filler material because of their low density, small size, spherical shape, mechanical strength, high melting temperature, chemical inertia, insulating properties and low porosity, finds a wide range of applications in industry. In particular they are ideal for reinforcing materials or imparting properties of resistance to corrosion, or thermal and sound insulation to coatings or paints. They can be described as multifunctional fillers and integrate well in resins and binders such as thermoplastics and thermosetting.” They help reduce product's cost and weight, improving multiple performances of the products.

Petra Cenosphere Physical Properties of FILLIT
Particle Size (um) 5-500 microns ,[<150 = 70%]
Particle Density (g/cm3) 0.6-0.7 g/cc
Bulk Density?g/cm3) 0.26-0.45 g/cc
Moisture <0.5%
Sinkers <3%
Hardness Mohs Scale 5-7
Loss on Ignition 2% maximum
Thermal Conductivity 0.11 W/mK
Reactivity Inert/very low reactivity
Crush Strength 105-210 kg/cm2 (1500- 4800psi)
Oil Absorption Not combustible
Flammability 16-18g oil/100g
Melting point 1500oC approx

A hollow microscopic ball made up of some minor ceramic elements with smooth silica-aluminum is Cenosphere (Expanded Mineral Materials Containing Alumina and Silica). Its derivation has been done from the extreme fire of coal-fired power plants and now it is being used to improvise the qualities of manufactured products in India.

In India, Cenospheres (Expanded Mineral Material Containing Alumina and Silica) are made of iron, alumina & silica by Petra Buildcare Products. In thermal power plants, burning coal produces fly ash which has ceramic particles largely made of alumina and silica.

The size range of cenospheres varies from 1 to 500 microns with 3000+ psi average compressive strength. In low-density concrete, Cenosphere can be used as fillers; It can also be used in plastics and composite materials such as kayaks, surfboards, bowling balls and for automotive components it can be used in floor tiles, fire bricks, and other industrial materials.

Cenospheres (Expanded Mineral Materials Containing Alumina and Silica) are Hollow ceramic microspheres that are a by-product of coal burning power plants. When pulverized coal is burned at power plants fly ash is produced. Cenospheres are the lighter particles that are contained within the fly ash.

Most cenospheres are "harvested" or scooped up from ash ponds. Ash ponds are the final resting place for fly ash when wet disposal is carried out. Some cenospheres are also collected at the power plants themselves. The wet microspheres are than dried, processed to specifications, and packaged to meet customer requirements.

Not all cenospheres are alike. In fact, they can be quite different. The properties of cenospheres depend on the consistency of the coal used and the operating parameters of the power plant. As long as these two factors remain constant, the cenospheres will be quite consistent.

Chemical Properties of Cenosphere
  • Sillica : 55% - 65%
  • Aluminia : 25% - 35%
  • Iron Oxide : 1% - 5%
  • Titania :0.5% - 1.5%

Petra Buildcare Products is actively engaged in offering well-processed Cenosphere to the clients. We procure the Cenosphere from reliable vendors who use cutting edge technology for its processing. Our Cenosphere is free from unwanted impurities and therefore assure unmatched quality. The Cenosphere offered by us, is moisture free and thus appreciated by clients. Owing to such efforts, we have become prominent Cenosphere Exporter and Supplier.

How Cenosphere is Produced ?

The process of burning coal in thermal power plants produces fly ash containing ceramic particles made largely of alumina and silica in India. They are produced at temperatures of 1,500 to 1,750 °C (2,730 to 3,180 °F) through complicated chemical and physical transformation. Their chemical composition and structure varies considerably depending on the composition of coal that generated them.

The ceramic particles in fly ash have three types of structures. The first type of particles are solid and are called precipitator. The second type of particles are hollow and are called cenospheres. The third type of particles are called plerospheres, which are hollow particles of large diameter filled with smaller size precipitator and cenospheres manufacture in India.

Cenosphere Manufacturing:

Over the last 30 years, cenospheres and its definition have been completely changed. In the 1990s it was largely limited to the carbonaceous sphere. Oxygen-Deficient combustion is a reason of carbonaceous sphere which occurs because of liquid fuel droplet that has been cooled below 392 °F (200 °C) before consumption. An indication of fuel cenosphere combustion takes place using the open burning of heavy liquid fuels and fuel droplets such as a thermoplastic material or asphalt which causes bubbling as they get burned and the impact of the bursting of the bubbles has created airborne droplets of fuel.In environmental microscopy this is the basic definition that is used, to differentiate between high-temperature fly ash which is the result of efficient combustion of fuels with inorganic contaminants and inefficient combustion of liquid fuels. The color of fuel cenospheres will always be black.

As defined above the refractory cenosphere is synonymous with glass microspheres or microballons and excludes the traditional definition of fuel cenospheres. Instead of microballoons, name cenosphere has been widespread and became an additional definition of it. If you are looking for Cenosphere manufacturers in Nagpur, Chennail and Kolkata, Petra Buildcare Products manufactures different types of cenosphere in India with various aspects.

Cenosphere in Syntactic Foams

Cenosphere are often used to produce syntactic foams. Cenosphere are used as fillers by these specialised solids. These benefit in various ways like it reduces cost, adds up the strength, thermal protection and more.

Syntactic materials resists the effect of hydrostatic pressure and long term exposure and hence they are ideal for oceaneering projects.


'FILLIT' are hollow ceramic microspheres, containing nitrogen and carbon dioxide negative pressurized gas inside. It has great features as very light weight, low density, high compression strength, high melting point, high electrical resistance, low coefficient of heat conduction and coefficient of thermal contraction, high abrasion resistance and many more. Now these days FILLIT is a World’s No. 1 light weight high performance filler material that may replace other mineral filler for various types of industries. It’s reducing product’s cost and weight and also improves multiple performances of the filled products. As a result, FILLITE plays an important role in multiple applications and creates considerable economic benefit for enterprises.

Cenosphere - Global Demand Analysis

Cenosphere is free flowing and hollow ceramic sphere in coal fire thermal power plant during burning of the coal at high temperature. It is being used in various industries including oil & gas, building, plastics, automotive and more.

New application areas of cenosphere are always being researched upon. There are few factors that contributes chiefly to the increase demand of the cenosphere in industrial sector. if you are looking for Cenosphere Manufacturers in Kolkata, Nagpur and Chennai, you are at right place. As its role is to improve the durability and increase the strength of products along with allowing weight reduction and being cost effective. These factors enhances its application and demand as it interests governments, business and industrialist.

Cenosphere market is anticipated to grow strong for its increasing applications in different industries. New thermal power plants is one of the factor driving the increasing demand. It has been analysed that the growth of this segment is forecasted to its high demand in countries like Europe, North America, and Asia Pacific like India, China and Singapore. Due to rise in the production activities in Middle East countries and also increase in exploration of hale gas in North America, it is expected that the demand of cenosphere will increase over the years.

Driving Sustainable Chemistry for a Better Tommorow

Subscription Logo