Cenospheres
General Product Information
& Specifications

Cenospheres:
General Product Information CenoStar Cenospheres are inert, hollow ceramic spheres. They are used to reduce weight in concrete, resins, plastics, ceramics, paints, coatings and many other building products. Other benefits include increased filler loading, reduced shrinkage, lower viscosity, fireproofing, lubricity, and transport savings. High Alumina cenospheres have been developed for higher temperature applications such as refractory, foundries and high temperature coatings and flame-retardants. The low particle density of cenospheres enables slower stages of separation in paints and adhesives unlike using heavy metallic and inorganic fillers.

EconoStar Series:
CenoStar’s standard grade ES series has many uses since it is the most versatile and lowest-cost cenosphere. The products range in size from <500 microns, <300 microns, and <106 microns with specific gravity ranging from 0.65g/cc to 0.9g/cc depending on customer requirements. High Alumina Series: The High Alumina (HAL) spheres are specifically a high alumina cenosphere. Unique sources of raw materials enable CenoStar to produce spheres with high alumina content (35-43%). It is especially suited to high-temperature applications including refractory, foundry, coatings, and flame-retardants.

KZ Series:
Our KZ cenospheres derive from Kazakhstan. It is a near-white product and can be used in
applications where color is important.

WhiteStar Series:
The WS Series spheres are a flagship product for CenoStar. The WS group is lower in density at
0.70 – 0.72 g/cc and has near white color, (Hunter scale 70-73). WS spheres are available in 3 size
ranges: <500 microns, <300 microns and <106 microns. Useful as a lightening agent when
combined with cements that improve the mechanical properties, including compressive strength,
tensile strength, flexural strength and fracture toughness.

Custom Engineered Spheres:
CenoStar prides itself in the ability and willingness to custom design products to meet your specific
needs. Based on specific gravity, size distribution, color, chemistry, or a combination of these
criteria, we can develop a product to meet your increasingly demanding applications.

Color
Gray to near white with the unaided eye. See individual data sheets for Hunter Whiteness index.

Oil Absorption
16-18 g oil / 100cc Hollow Microspheres
Thermal Conductivity
0.1- 0.2 W/mK

Packing Factor
The ratio of bulk density to true density is: 43-58%

Packaging
Available in double-walled paper bags which can be lined upon request, 20kg bags (Fig.1)
500kg Bulk Bags (Fig. 2), or palletized corrugated shipping container.