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

3D-printing is a new additive forming technology for ceramic components. It will find its application mainly for fabrication of prototypes, small series or complex geometries, with internal hollow spaces e.g., which are not able to be produced by other, traditional techniques.


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

Aluminum Oxide exhibits lower strength than SSiC und Si3N4. The strength at 1,000°C is ca. 60% lower than at room temperature. Al2O3 is an electrical insulator and a fairly good heat conductor (ca. 20 ? 30 W/mK). The corrosion resistance in the acidic range is good (pH < 7, but poor in the basic range (pH > 7). Due to 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 it can be improved considerably 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/electronics
  • medical, ballistics
  • firing supports for sintering of metals
  • high temperature furnaces


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Verify Your Spool

Check the course of diameter on the entire length of the spool, ovality, mean diameter and standard deviation for each manufactured spool individually.

Where to buy

Check the list of our local and online distributors.

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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