For multi-layer filter packs in 304 Stainless Steel, the controlling selection factors are the media being filtered, the cleaning regime and the service temperature. The grade data for 304 Stainless Steel is summarized below together with every specification supplied.
Why Choose 304 Stainless Steel for Multi-Layer Filter Packs
The standard general-purpose stainless mesh alloy. For multi-layer filter packs, 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 |
Cleaning & Compatibility
Stainless multi-layer filter packs 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.
Comparable Alloys
The direct upgrade from 304 is 316L (chlorides, acids, CIP). Downgrade options for dry, indoor screening are galvanized or plain steel. For heat beyond ~450 °C move to Inconel 600; for seawater immersion consider Monel 400 or duplex 2205 for multi-layer filter packs.
Specifications of Multi-Layer Filter Packs Available in 304 Stainless Steel
| Diameter (mm) | Mesh / micron options | Layers | Edge treatment | Reference standard |
|---|---|---|---|---|
| 20 | Coarse guard + fine + support | 3 | Spot welded | Extruder / SPM pack |
| 38 | Coarse guard + fine + support | 3-5 | Spot welded | Extruder / SPM pack |
| 50 | Coarse guard + fine + support | 3-5 | Bound rim | Extruder / SPM pack |
| 90 | Coarse guard + fine + support | 5-7 | Bound rim | Extruder / SPM pack |
| 155 | Coarse guard + fine + support | 5-7 | Bound rim | Extruder / SPM pack |
