304 Stainless Steel filter discs is stocked to ISO 9044 base cloth. The alloy provides good general corrosion resistance in atmosphere and fresh water and is essentially non-magnetic (annealed); the practical service limit is approx. +450 °C continuous. Property data, alloy comparison and the specification table follow.
Why Choose 304 Stainless Steel for Filter Discs
The standard general-purpose stainless mesh alloy. For filter discs, this matters when good general corrosion resistance in atmosphere and fresh water is the controlling requirement.
Alloy Properties
| Grade designation | AISI 304 (1.4301) |
|---|---|
| Magnetic response | Essentially non-magnetic (annealed) |
| Service temperature | approx. +450 °C continuous |
| Corrosion characteristic | Good general corrosion resistance in atmosphere and fresh water |
Corrosion Behavior in Filtration Service
304 gives good resistance to atmospheric exposure, fresh water and most neutral media, and is the standard general-purpose grade for filter discs. In chloride-bearing service (seawater, brines, road-salt spray) step up to 316L; in reducing acids consider a nickel alloy.
Cleaning & Compatibility
Stainless filter discs can be cleaned by backflush, ultrasonic bath, steam and most CIP chemistry. Two cautions: (1) avoid extended contact with hydrochloric acid or hypochlorite sanitizers, which pit even 316; (2) where the mesh contacts carbon steel during fabrication or service, iron pick-up can rust-stain the surface — specify passivation after fabrication.
Specifications of Filter Discs Available in 304 Stainless Steel
| Diameter (mm) | Mesh / micron options | Layers | Edge treatment | Reference standard |
|---|---|---|---|---|
| 10 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-5 | Plain cut or spot welded | ISO 9044 base cloth |
| 20 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-5 | Plain cut or spot welded | ISO 9044 base cloth |
| 38 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-5 | Spot welded or bound rim | ISO 9044 base cloth |
| 50 | 40-Mesh to 500-Mesh / 25-400 u00b5m | 1-7 | Aluminum / SS bound rim | ISO 9044 base cloth |
| 100 | 40-Mesh to 635-Mesh / 20-400 u00b5m | 1-7 | Aluminum / SS bound rim | ISO 9044 base cloth |
| 200 | 40-Mesh to 635-Mesh / 20-400 u00b5m | 1-7 | SS bound rim | ISO 9044 base cloth |
| 300 | 40-Mesh to 635-Mesh / 20-400 u00b5m | 1-7 | SS bound rim | ISO 9044 base cloth |
Where 304 Stainless Steel Filter Discs Is Used
- Plastic extrusion: single and multi-layer extruder screens.
- Fuel, oil & hydraulics: inlet strainer discs in pumps and fittings.
- Spray & nozzles: nozzle filter screens.
- Appliances & medical: small metal mesh filter discs in valves and devices.
Ordering Filter Discs in 304 Stainless Steel
- Diameter & shape: Round, rectangular, kidney or custom shapes cut to drawing.
- Mesh & layers: Single layer or a stack of different meshes for strength and rating.
- Edge: Plain cut, spot-welded, aluminum/copper/stainless rimmed or sintered edge.
Mistakes to Avoid with Filter Discs
- Plain-cut fine discs that fray and shed wires.
- Stacking layers in the wrong order.
