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Lightweight Cenosphere Fillers for Casting Applications & Plastic filler Cenosphere

Cenosphere is a lightweight, hollow sphere made largely of silica and alumina and filled with air or inert gas, typically produced as a coal combustion byproduct at thermal power plants. The color of cenospheres varies from gray to almost white and their density is about 0.4–0.8 g/cm3 (0.014–0.029 lb/cu in), which gives them a great buoyancy.

Cenospheres are hard and rigid, light, waterproof, innoxious, and insulative. This makes them highly useful in a variety of products, notably fillers.

Cenosphere characteristics: Fine particles, hollow, light weight, high strength, wear resistance, high temperature resistance, thermal insulation.

    Cenospheres Production and our factory

    The process of burning coal in thermal power plants produces fly ash containing ceramic particles made largely of alumina and silica. 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.
    Our cenosphere factory established in 1980, manufacturing around 4,000tons yearly. During the production, we withdraw and test the sample every half an hour, control the size distribution, true density, bulk density, whiteness and floating ratio very strictly. We ship our Cenosphere to Japan, Korea, Southeast Asia, America and South America etc markets, mainly used for Foundry & Casting industry, Plastic filter, Insulation material and Refractory materials. Based on professional production, timely delivery and strict quality control, we are confident in providing you with the most suitable Cenosphere. 
    Commodity: Cenosphere / Microsphere 
    Size: 20mesh, 40mesh, 60mesh, 80mesh, 100mesh, 150mesh
    Density: 0.35-0.46g/cm3
    True Density: 0.75, 0.85, 0.95, 1.05
    Floating ratio: 90-96%
    Melting Point: 1500-1650℃

    Chemical Analysis


    % by weight


    57 – 60 %


    30 – 33 %


    0.88 – 1.2 %


    1.1 – 1.3 %


    2.4– 3.2 %


    0.8 – 1.15 %


    0.35 – 0.5 %


    0.85 – 1.15 %


    Refractory insulation cenosphere;
    Plastic additive cenosphere;
    Lightweight castable cenosphere;
    High-grade paving cenosphere;
    Oil drilling industry cenosphere;
    High temperature and high voltage insulators cenosphere;
    Surface composite cenosphere;
    Metallurgy casting cenosphere.


    Packing: 25kg, 500kg, 550kg and 600kg bags.
    Quantity: 10-12Mt/20'GP, 22-26Mt/40'HQ