Silica Fiberglass Filter Mesh Roll For Foundry Filtration
Silica Fiberglass Filter Mesh Roll | Customizable Foundry Filtration Solutions
Supplied in high-capacity formats, our Silica Fiberglass Filter Mesh Roll offers maximum flexibility for large-scale foundry operations. This versatile mesh roll can be easily cut to any custom size or shape on-site, providing a cost-effective filtration medium for aluminum smelting shops that require bulk material for varied casting filtration needs.
We offer a comprehensive range of material grades, including Standard Silica for non-ferrous applications and High Silica (>96% SiO2) for extreme heat environments. Whether you need untreated white cloth, resin-coated brown mesh, or high-performance carbonized black fabric, our rolls are engineered to deliver consistent pore size, exceptional thermal resistance, and structural stability.
Technical Specifications & Customization
We provide full flexibility in material composition and finishing to match your specific casting requirements.
Standard Silica Cloth: Cost-effective solution for aluminum, zinc, and lead filtration.
High Silica Fabric: Premium grade for molten iron, copper, and small-scale steel casting.
2. Color & Coating Options
White (Natural): Uncoated or light-starched, used for low-temperature filtration or further processing.
Brown (Resin Coated): Enhanced stiffness for easy cutting and positioning in the mold. Ideal for most iron foundries.
Black (Carbonized): Subjected to a specialized high-temperature carbonization process to minimize gas evolution and maximize heat resistance.
3. Weave Styles
Plain Weave: High stability and uniform pore distribution.
Leno Weave: Superior resistance to “mesh shifting” under high-pressure metal flow.
Key Advantages of Mesh Rolls
Maximum Material Utilization: Buying in rolls allows you to cut exact shapes, reducing edge waste and lowering costs per unit.
Consistency: Every roll undergoes tension testing to ensure the mesh does not distort during the pouring process.
Cleanliness: Produced in a dust-free environment to ensure no organic contaminants interfere with the melt.
Compatibility: Works perfectly with manual, semi-automatic, or fully automated cutting machines.
Silica Fiberglass Filter Mesh Applications in The Casting Filtration Industry
Primary Applications
The Fiberglass Mesh Roll is integral to numerous casting filtration processes, serving as the foundational material for manufacturing essential glass fiber filters used in molten aluminum filtration:
Aluminum Foundries: Large-scale filtration for engine parts, wheels, and aerospace components.
Iron & Copper Casting: Removing slag and dross in gravity casting systems.
Custom Filter Fabrication: Serving as the raw material for sewn filter bags, hat-shaped filters, and reinforced mesh inserts.
These fiberglass filters are vital for achieving cleaner castings, offering specific applications:
Cutting pieces for mold filtration: Ideal for sand casting, gravity casting, and similar processes.
Cutting pieces for riser sleeves, bottom or across ports in walls.
Cutting pieces to provide a weakened plane for riser knock-off.
Cup shapes for investment casting or using with pouring cups.
Casting Filtration Ability (Based on experience only):
Note: The above-mentioned area refers to the effective area that the poured molten metal passed, not including any extra part for fixing or holding the mesh filter.
Customizable Fiberglass Filter Mesh Dimensions:
Cut pieces can be rectangular or round, with sizes ranging from 20x20mm to 900x1000mm.
Pre-formed cup filter outside diameters can be 100/110/115/120mm or as per request.
Silica Fiberglass Filter Mesh Function in Molten Metal Filtration
Fiberglass mesh filters play a crucial role in molten aluminum filtration, with their primary functions outlined as follows:
Removal of Inclusions and Impurities: They effectively remove slag, refractory particles, and non-metallic inclusions from molten aluminum.
Improved Casting Quality and Reduced Defects: They can reduce casting impurities by half, thereby lowering the defect rate. By filtering out impurities, they minimize the adverse effects on cast alloy structure and performance, significantly enhancing casting performance and surface quality.
Enhanced Machinability: They contribute to improving the machinability of castings.
Increased Yield and Production Efficiency: Through defect reduction and process optimization, they lead to higher production yields.
Optimized Aluminum Flow and Filling: They improve the fluidity of the molten aluminum and its distribution within the mold.
Reduced Turbulence and Secondary Oxidation: They minimize turbulence during pouring, which in turn reduces secondary oxidation and slag generation.
Cost-Effectiveness: They are characterized by low cost and ease of use.
Compatibility: They can be used with existing pattern equipment.
Minimized Gating System: They help to minimize the gating system, thereby reducing costs.
Aluminum Casting Filtration Principle
The mechanism by which fiberglass mesh filters purify molten aluminum primarily involves the following four aspects:
Rectification: During the pouring process, the filter is positioned in the path of the molten aluminum, increasing resistance to flow. This alters the flow state, allowing the molten aluminum to enter the mold slowly and smoothly, effectively preventing turbulence and ensuring stable mold filling. Stable filling reduces secondary oxidation and slag formation, and aids in the flotation of inclusions and the retention of slag by the gating system.
Mechanical Filtration: Molten aluminum often contains a large number of larger inclusions and dross. The fiberglass mesh filter mechanically intercepts and removes these impurities that are larger than its mesh openings by selecting an appropriate mesh size.
Double Filtration: During the mechanical filtration process, the filter mesh captures a significant amount of inclusions larger than its pores. As the quantity of inclusions increases, a “filter cake” or “double filtration layer” gradually forms at the filter’s inlet. This layer further refines the aluminum flow, acting as an additional filter and achieving secondary filtration of the molten aluminum.
Adsorption: The filter mesh possesses a large specific surface area. As molten aluminum flows through the filter, it is divided into small streams, which significantly increases the contact area between the aluminum and the filtration medium. In this process, certain harmful elements and oxides within the molten aluminum react chemically with the filter surface and are adsorbed onto it, further purifying the molten aluminum.
How to Use: Best Practices for Foundry Filtration
To maximize the efficiency of Explorer fiberglass filters, follow these professional guidelines:
Selection: Ensure the filter’s temperature rating matches your pouring temperature (800°C for Aluminum; 1700°C for Steel/Iron).
Placement: * In-Mold: Place the filter sheet at the bottom of the sprue or within the runner system. Ensure the filter covers the entire cross-section of the runner to prevent “bypass” leakage.
Filter Box: For continuous casting, secure the mesh in the designated filter slot within the launder or distribution box.
No Pre-heating Required: Unlike ceramic foam filters, Explorer fiberglass mesh does not require pre-heating. It can be placed directly into a cold or warm mold.
Avoid Direct Impact: Whenever possible, position the filter so the molten metal flow is not directly hammering the center of the mesh at high velocity. Angled placement or “stepped” runner designs help extend filter life.
Single Use: These filters are designed for single-use applications. Replace the mesh after every pouring cycle to ensure maximum filtration precision and prevent dross carry-over.
Frequently Asked Questions (FAQ)
Q1: What is the difference between the White, Brown, and Black rolls?
The colors represent different treatment stages. White is the raw silica fiber; Brown is coated with a stiffening resin for better structural integrity in the sand mold; Black is carbonized, which is the premium choice for minimizing gas evolution and handling the highest temperatures.
Q2: Can I get custom roll widths for my automatic cutting machine?
Yes. Our standard widths are 450mm and 900mm, but we can slit the rolls to any width between 50mm and 1000mm to fit your production line requirements.
Q3: How do I know if I need Standard or High Silica?
It depends on your pouring temperature. For Aluminum (approx. 700°C), Standard Silica is sufficient. For Molten Iron (1100°C – 1200°C), you must use High Silica Mesh Roll to ensure the mesh doesn’t lose its structure or melt during the pour.
Q4: Does the carbonized coating (Black) leave residue in the metal?
No. On the contrary, the carbonization process removes most volatile organic compounds. This results in the lowest gas evolution possible, preventing “gas holes” and ensuring a cleaner final casting compared to standard resin-coated mesh.
Q5: How should these rolls be stored?
Silica mesh rolls should be stored in a dry, ventilated area in their original packaging. Moisture can affect the resin coating’s stiffness, so keeping the rolls sealed until use is recommended for optimal performance.
