SGL Carbon’s graphitized microballoons are designed as a unique and special filler material e.g. for epoxy, polyurethane or polyester resins to reduce their density and increase their strength and dimensional stability. They function as non-halogenated flame-resistant filler and support to provide greater thermal insulation. Phenolic resin microspheres are carbonized and graphitized at 2000°C (3632°F) to produce graphitized microballoons of high purity.
Ash content cash
0.2 % at 20 °C
Particle size D50 D50
Specific surface area Asurf,specific
BET; DIN ISO 9277
Tap density ρtap
0.18 g/cm³ at 20 °C
True particle density ρparticle
1.43 g/cm³ at 20 °C
Water content cwater,cont
0.1 % at 20 °C
Particle size < 50 mesh/300 µm: 98% (ASTM E11); Particle size D50 = 51 μm (ISO 13320)
This material data has been provided by SGL Carbon.