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To fulfil today's quality demands for casthouse and foundry products, a high purity grade of metal quality is needed. Even the smallest inclusions can lead to cracks, pinholes or poor surfaces and make the final product not useable.The high purity of the melt can be achived by using a cermaic foam filter. Drache manufactures different types of ceramic foam filters:

-  Ceralu and Duplex filters for Aluminium casthouses and foundries

-  Cerasic filters for grey-iron and copper foundries

-  Cerazirc filters for steel and superalloy foundries

 Highly effective separation at a low pressure differential are the key terms applying to Cerapor filter products.

Depending on the particle size to be retained, and on the desired flow rate, we supply filters in a wide range of porosities from 10 to 60 ppi (pores per inch).

In addition to the standard dimensions for horizontal or vertical installation in the casting system, Cerapor filters of different geometries are also, on request, produced as duplex filters (two different pores/filter plate).

For mould castings, round or rectangular small filters are produced to any dimensions.

  In order to permit the use of Cerapor filters in different casting processes, we have developed different filter types for meeting various special needs:

Ceralu ceramic foam filters on the basis of aluminium oxide, specifically designed for aluminum filtration.
Cerasic ceramic foam filters for nodular iron castings, grey iron castings and malleable castings, and for the filtration of non-ferrous metals.
Cerazirk ceramic foam filters for steel filtration on the basis of zirconia, up to 1,700°C


The high quality of Drache's Cerapor filters is guaranteed and controlled by our IS0 9001 approved quality management.

For the bigger size filters (larger than 7"), every single filter is check on dimensions, weight and pressure drop. All these data is recordered and can be re-viewed if any problem with these filters should occur.

For the small size filters, samples from every batch are taken. These samples are checked on dimension, weight and mechanical strenght.

Production Processworks

1.  quality check on the PU foam (pressure drop testing, comparrision to reference samples)

2.  the foam is cut to size on a fully computer controlled cutting machine

3.  impregnation of the foam with the ceramic slurry

4.  filters are dried

5.  sintering process; the foam is burned while sintering

6.  final quality inspection on dimensions, squareness, pressure drop and weight

7.  packaging and shipment

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