HMG1 FractalBalls™

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Product Highlights
Low density (~1.1 g/cc)
High porosity (70%)
High temperature (up to 1900°C)
Castable (with FractalPaste™)


FractalBalls™ are high strength, high porosity ceramic balls available in the HMG1 material and HA material.
Fractalins™,  HDFractalins™, and HA Fractalins™ are preformed structures (boards and bricks).
Fractalins™ have a density of ~0.7g/cc, and HDFractalins™ have a density of ~1.1g/cc.
HA Fractalins™ are made of high Alumina material.  HD Fractalins™ are made of HMG1 material.

PDF File(18k) 
Picture of 1mm size HMG1 FractalBalls™
Macropicture of 3mm size HMG1 FractalBalls™

Material Safety Data Sheet

reviewed 2009

Product Specifications (Nominal Only)
  3mm 5mm
Service Temperature   °C (See FAQ's) 1900 1900
Density g/cm3  ~ 1.1 ~1.1
Porosity, %   ~70 ~70
Surface Area(BET), cm2/g 950 990
Liquid (chemical) absorption, wt% 50  50
Water absorption characteristics Generally provided with Hydrophobic surfaces
Chemical Composition
     % Al2O3
     % SiO2 (diverse forms) not exceeding (mostly combined with    alumina)
     Free silica




Loss on ignition 0 0
Cold Compression strength (N/mm2 or MPa) for each individual ball - 1 for 3mm
ball size
Linear shrinkage at service temperature 24h in % <1% <1%
Nominal thermal conductivity W/m, K 1200°C 0.2 0.2
Usual dimensions in mm (range) 2-3.5 4-5
                        * Nil below detectable levels
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FRACTALBALLS™ may be used as thermal insulation, chemical substrates or as 
structural materials when bonded with FRACTALPASTE™.  These have multi-purpose use. 
When bonded to each other they are called Fractalins™.


  • Use as thermal insulation: FRACTALBALL™ has very low density, low thermal conductivity, high strength, and high melting point; it can be formed into any shape and size and be used in any refractory/insulation parts for high and low temperature application. 
  • Use for high surface reactivity: FRACTALBALLS™ have very high porosity/low density, high strength, and high melting point. They may be used for high temperature filter and membrane substrate applications.  
Typical Applications are:
  •      Light weight structure materials.
  •      Composite manufacture reinforcement additive for metal, ceramic, or polymer. 
  •      Armor, bio-ceramic, abrasive brake pads etc. 
  •      Coatings for surfaces (metals, ceramics, polymers.)
  •      Thermal insulation
  •      Fire protection and stops
  •      High temperature furnace linings
  •      Kiln furniture
  •      Gas combustion burners
  •      Repairing or relining refractory cracks and holes
Other applications are:
  •      Filter 
  •      Molten metal castings (aluminum, copper, iron)
  •      Steam cleaning. 
  •      Apply as light weight coating for vehicles.
  •      Oil trapping and recovery; grease filters; chemical and water purification processes.
  •      Hot-gas filter substrates for electrode. 
  •      Electronic substrate carriers for bioreactors. 
  •      Desiccants 
  •      Substrates for catalytic converters 
  •      Use as light weight structural materials 
  •      FRACTALBALL™ has a unique microstructure, very low density, high strength, and high hardness

What is the difference between FRACTALINS™ and FRACTALPASTE™ bonded FRACTALBALLS™?

The FRACTALIN material and the FRACTALPASTE bonded FRACTALBALLS are bulk materials consisting of stacked/bonded FRACTALBALLS. However, because of differences in the manufacturing process, they display slightly different properties as shown below. FRACTALINS™ are factory products shapes/boards made by a special joining process. The FRACTALPASTE  bonded FRACTALBALLS, on the other hand, are made into shapes/boards with the mixing and firing of FRACTALBALLS and FRACTALPASTE by the user. (See section on how to bond FRACTALBALLS with FRACTALPASTE). The HMG1 material, of which the FRACTALBALLS are made, and the FRACTALPASTE material may be used up to temperatures in excess of 1850°C. All trade marks on this document belong to MATTECH CORPORATION unless otherwise stated. 

FRACTALBALLis an unique lightweight, non-hollow porous ball with a very low density and high strength. The material of the FRACTALBALLS (called HMG1) has excellent heat, chemical and mechanical stability; the spheres have low thermal conductivity and high thermal shock resistance. The spheres are sold in a fully fired condition with excellent dimensional stability up to 1900°C. FRACTALBALLS are environmental-friendly materials: they do not contain any hazardous materials such as organic volatents or fibrous materials, and will not produce any smoke or odor when heated. They also have desirable chemical, physical and mechanical properties, such as inertness to chemical attack (solvents, acids, alkalies, and detergents), non-wettability by molten metals such as aluminum, high thermal stability, high strength, and micro-biological stability. These features permit the FRACTALBALLSto be used in various applications. 

FRACTALBALLS, which are made from the HMG1 material, may be used in loosely stacked form or bonded into any size and shape part by bonding the FRACTALBALLS with FRACTALPASTE. These flexible processing possibilities allow FRACTALBALLS to be use in various technologies.

1mm Ball
3mm Ball
5mm Ball
Surface Microstructure of different size Fractalballs™.  The micron marker is 10 microns.


Properties of Material HMG1:

Color: White
Nominal Composition,wt %
SiO2: (diverse forms) not exceeding 8% (mostly combined with Alumina)
Al203: ~92%
Impurities: less than 1%
Ball Density, g/cc: ~1.1
Stacked Density,g/cc: ~0.7
Diameter,mm: (major range 1- 5 mm)
Maximum Use Temperature,°C: up to1900° C Load carrying capacity diminishes after 1870°C. (See FAQ's)

Ball Porosity, % (average standard approximate): 70

(Can be made with higher porosity when required for custom orders)

Strength: Each 3mm ball supports approximately 10 kg of Load. High Strength.
FractalBalls™ have a porosity of about 70%; when loosely stacked the porosity is about 85%, FractalPaste bonded FractalBallshave a porosity of 75% whereas Fractalins have a porosity of about 80%. FractalBallsglued with FractalPaste has a strength of 5 MPa whereas Fractalins have a strength of about 6 MPa. (Our data is approximate and changes from batch to batch).