What Are Aluminosilicate Cenospheres and Where Are They Used?
Aluminosilicate cenospheres are lightweight, hollow mineral microspheres used as functional fillers in a variety of industrial materials. Their hollow spherical structure, low density and mineral composition make them useful where manufacturers need to reduce weight or modify the physical properties of a material.
What Are Cenospheres?
Cenospheres are hollow microspheres consisting primarily of aluminosilicate material. They are commonly associated with fly ash and are valued for their combination of low weight, spherical particle shape and thermal properties.
Because of their hollow structure, cenospheres can be used as lightweight fillers in formulations where conventional mineral fillers would add significantly more weight.
Key Properties of Cenospheres
The suitability of cenospheres depends on their specific physical and chemical characteristics. Important parameters for industrial buyers include:

• Particle size
• Bulk density
• Moisture
• Chemical composition
• Loss on ignition (LOI)
• Thermal behaviour
• Packaging and handling requirements

For industrial applications, the correct specification should be selected according to the formulation and processing requirements of the final product.
Where Are Cenospheres Used?
Cenospheres are used across a range of industrial applications.
1. Construction Materials
Cenospheres can be incorporated into lightweight concrete, mortars and other construction materials where reducing material density is an important consideration.
Their spherical shape and lightweight structure make them suitable for formulations requiring a lower-density mineral filler.
2. Refractory Materials
Cenospheres are used in refractory and thermal-insulation materials. Their lightweight structure and aluminosilicate composition can make them suitable for formulations designed for high-temperature environments.
The appropriate grade and formulation should always be evaluated against the required operating temperature and mechanical properties.
3. Paints and Protective Coatings
Cenospheres can be used as functional fillers in paints, protective coatings and related formulations.
Depending on the formulation, their low density and spherical particle structure can contribute to weight reduction and other changes in the physical characteristics of the coating.
4. Polymers and Composites
Cenospheres are also used as lightweight fillers in polymer-based materials and composites.
They can help manufacturers develop materials with lower density while maintaining a mineral filler component. Their application depends on resin type, particle characteristics and the required mechanical properties.
5. Ceramics and Other Industrial Materials
Cenospheres can also be considered for ceramic formulations and other industrial applications where lightweight mineral fillers with specific particle characteristics are required.
Why Particle Size Matters
Particle size is one of the key parameters when selecting cenospheres.
A formulation may require a specific particle-size distribution depending on the manufacturing process, filler loading and required final properties.
OMB Group currently offers aluminosilicate cenospheres in a general particle-size range of 0–500 μm. The material is supplied dry and available in Big Bags. Technical parameters such as chemical composition, bulk density, moisture and LOI are available in the relevant TDS and COA.
Aluminosilicate Cenospheres from OMB Group
Since 2015, OMB Group has been supplying industrial raw materials and metals to manufacturers, processors and distributors across Europe.
Our aluminosilicate cenospheres are supplied for industrial applications and are currently available in the general 0–500 μm range.
Product information:

• Aluminosilicate cenospheres
• Particle size: 0–500 μm
• Condition: Dry material
• Packaging: Big Bags
• Available quantity: 22–500 MT/month
• Origin: Kazakhstan
• Samples: Available upon request
• Technical documentation: TDS / SDS / COA

Product availability, technical parameters and commercial conditions are confirmed according to customer requirements.
How to Select the Right Cenospheres
Before purchasing cenospheres, industrial buyers should define the technical requirements of the final application.
Important information may include:
Particle size: What particle-size range is suitable for the formulation?
Bulk density: What target density is required?
Moisture: Does the process require dry material?
Chemical composition: Are there specific limits for SiO₂, Al₂O₃, Fe₂O₃ or other components?
Quantity: Is the requirement a trial shipment or regular monthly supply?
Delivery: What is the destination and preferred Incoterm?
Providing this information allows the supplier to prepare a more accurate commercial and technical proposal.
Technical Documentation
For qualified industrial buyers, technical documentation can be provided according to product availability.
Available documentation may include:
TDS — Technical Data Sheet
SDS — Safety Data Sheet
COA — Certificate of Analysis
Buyers can also request a sample for technical evaluation.
Frequently Asked QuestionsWhat are aluminosilicate cenospheres?
Aluminosilicate cenospheres are lightweight hollow mineral microspheres used primarily as functional fillers in industrial materials.
What particle size does OMB Group offer?
OMB Group currently offers a general particle-size range of 0–500 μm.
Are the cenospheres supplied dry?
Yes. The currently listed OMB Group material is supplied as dry material.
What packaging is available?
The current product is available in Big Bags.
Can I request a sample?
Yes. Samples are available upon request.
Can OMB Group provide technical documentation?
TDS, SDS and COA documentation are available according to the product and customer requirements.
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