What filters can be used for iron and copper filtration?

Conclusion first:SIC ceramic foam filter!

What is SIC ceramic foam filter?

Silicon carbide structured foam ceramic filter, dark gray porous three-dimensional sponge-like framework, core consumable for deep filtration of high-temperature metal liquid in the foundry industry, simply named: SiC-CFF.

Main chemical components:

  ● Silicon carbide (SiC): 50-65% as the main phase, a high-temperature resistant matrix.

  ● Aluminum oxide (Al₂O₃): 20-30%, enhances sintering strength.

  ● Silica dioxide (SiO₂) and a small amount of fluxing components: forms ceramic bonding phase, improves thermal shock resistance and resistance to melt erosion.

PPI selection:

  ● 10-15 PPI: Large pores, high flow rate, ductile iron, large pouring volume, anti-blockage.

  ● 20 PPI: General standard, gray iron, ordinary ductile iron, copper alloy.

  ● 30 PPI: Fine pores, thin-walled precision castings, filtering tiny inclusions, reduced filtration flow rate.

Filtering principle:

It is not a simple screening process. It involves three-dimensional deep filtration:

  1. Mechanical interception: Larger particles (such as slag lumps and refractory material fragments) are directly blocked.

  2. Surface adsorption: The surface of the ceramic framework adsorbs micron-sized fine oxides and impurities (such as sulfides and silicates).

  3. Rectification and stabilization: The turbulent and boiling high-temperature metal liquid is transformed into a stable laminar flow, reducing the erosion of the mold and lowering the occurrence of slag and gas entrainment. The casting filling process becomes more uniform.

Application scenarios:

 1. Gray cast iron, ductile iron, malleable iron (the largest application market).

 2. Brass, bronze, high-temperature copper alloys.

Why choose SIC-CFF?

  1. Eliminate sand holes, slag holes and inclusions, and the scrap rate of castings significantly decreases.

  2. The castings have uniform structure, and their tensile strength, elongation and fatigue performance are improved.

  3. The surface quality of machining improves, and the wear of tools is reduced.

  4. Simplify the design of the pouring system and increase the process yield rate.

What can Hebei CangChen do for SIC-CFF?

Hebei Cangchen is a professional manufacturer for molten metal filtration products.

We provide full‑range customized solutions for overseas clients to match different foundry working conditions and equipment requirements.

Our customized service:

  1. Size & Shape: Square, round and special‑shaped cut pieces. Non‑standard sizes according to your drawings or physical samples, including ceramic foam filters, fiberglass filters, cap‑type filters.

  2. Technical Parameters: Adjustable PPI value, thickness and material formula for aluminum, cast iron, copper‑alloy filtration.

  3. Accessory Support: Expansive gaskets, edge‑sealing treatment for gating system installation.

  4. Packing & Label: Neutral export package, custom shipping marks and OEM brand labels.