SiCeram GmbH, in cooperation with Spectrum Filaments, has developed an innovative series of ceramic materials for 3D printing using FDM/FFF technology! Four specialized filaments are the first such commercial solution on the global market, enabling 3D printing of high-tech ceramics using typical desktop 3D printers.

3D printing is a new additive forming technology for ceramic components. It will find application mainly for the manufacture of prototypes, small batches or complex geometries, for example with hollow interior spaces, that cannot be produced by other traditional techniques.


Alumina is a filament containing alumina powder of high purity (99.7 percent). The use of appropriate organic agents as a binder results in a flexible filament that can be used in classic 3D printers operating in FFF/FDM technology. The organic content of the filament amounts to about 19.5 percent by mass.

Aluminum oxide has lower strength than SSiC and Si3N4. The strength at 1,000°C is about 60% lower than at room temperature. Al2O3 is an electrical insulator and a fair heat conductor (about 20 ? 30 W/mK). Corrosion resistance in the acid range is good (pH < 7), but poor in the basic range (pH > 7). Because of the relatively high coefficient of linear thermal expansion (8.5*10-6K-1), the thermal shock resistance of a dense material is relatively poor, but can be greatly improved by targeted incorporation of porosity.

Technical data

Content of organics:
19.5 mass-%
Green density of filament:
2.533 g/cm3
Sintered density:
3.85 - 3.96 g/cm3
Micro hardness:
17-20 GPa
Sintering temperature:
1.475 - 1.640°C
Sintering atmosphere:
Coeff. of lin. therm. exp. [10-6K-1]:
Thermal conductivity [W/mK]:
Electrical conductivity:
Linear shrinkage* (X/Y printing direction):
LSx/y = 19.0% | SF = 1.235
Linear shrinkage* (Z printing direction):
LSz = 21.5% | SF = 1.274
*from printed to sintered dimensions
scaling factor SF

How to use

Printing temperature:
Bed temperature:
Printing speed:
Fan setting:
Off (no fan cooling)
Recommended nozzle diameter:
Recommended nozzle type:
Hardened steel or rubin

Ceramic filaments manufactured by SiCeram GmbH & Spectrum Filaments are based on a polyamide, which distinguishes them from other, comparable sinterable filaments for 3D printing. Ceramic filament prints at very low temperatures, at 150-170°C with a bed temperature of 60-70°C.



The Alumina filament is much more brittle than standard plastic filaments for 3D printing. Due to the fact that the filament can be crushed / grounded through the feeding mechanism, it is recommended to use devices with a drive that feeds the filament into the extruder smoothly without too much pressure.


  • wear resistance
  • electrical/electronic
  • medical, ballistics
  • firing media for metal sintering
  • high temperature furnaces
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A wide range of products

Wide portfolio consisting of over 50 filaments with a versatile range of properties and applications, divided into three segments: desktop easy-to-use, industrial grade and high performance.

High quality

Innovation, extrusion know-how and highest quality filaments are the pillars of Spectrum philosophy. Our team is working continously on the development of new materials and their applications.

European made

All filaments from our portfolio are in-house made. We use modern production lines equipped with non-standard solutions to obtain highest quality final product.

Professional technical support

Our qualified support team helps at every stage from material selection to the 3D printing process.

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