Aluminium Low Pressure Castings Filtration

Galvanized steel or iron wire mesh filters are at present commonly used for low pressure castings filtration, especially for aluminum alloy wheels. The wire mesh filters are cost effective, with good strength and flexible on shapes and sizes. Now there is a new and better material to perfectly replace it due to the wire mesh filter has disadvantages.

Using the wire mesh filter, there will be largely Fe element added to the aluminum castings and this will lower the castings mechanical strength, especially for high quality standard, this means critical. For risers containing wire mesh filters after solidification, it can not remelted directly to furnace, even after the treatment. The direct cost is the risers had to be sold as scrap. It's great waste.

Fiberglass fabric mesh filters for aluminum filtration are specially designed and woven for the diffusion and filtration of molten aluminum. High twisted yarns are used to control strand diameters and resist flattening or distortion under pressure from contact with molten metal. The integrity of theweave pattern is maintained by the use of phenolic resin, and by the use of leno or Plain construction in high density. Regular coating and carbonized treatment are both available.

To use the fiberglass mesh filter to replace the traditional wire mesh filter and realize fiberglass aluminium filtration:

• Never change molten aluminum element or contaminate molten aluminum.
• No worry about the riser remelt anymore and easy to handle the aluminum scrap recycling.
• Fiberglass mesh can float on top of molten aluminum in furnace being remelt and recycled and it can be more easily scooped out.
• Reduces molten aluminum turbulence and improves distribution and flow.
• Remove oxides and inclusions to improve castings mechanical properties and surface finish.
• Excellent stiffness and toughness, good heat resistance.