Brass filter discs is stocked to ISO 9044 base cloth. The alloy provides good atmospheric and fresh-water resistance; unsuitable for ammonia service and is non-magnetic; the practical service limit is approx. +200 °C. Property data, alloy comparison and the specification table follow.
Why Choose Brass for Filter Discs
The decorative and spark-resistant screening alloy. For filter discs, this matters when good atmospheric and fresh-water resistance; unsuitable for ammonia service is the controlling requirement.
Alloy Properties
| Grade designation | H65 / CuZn35 |
|---|---|
| Magnetic response | Non-magnetic |
| Service temperature | approx. +200 °C |
| Corrosion characteristic | Good atmospheric and fresh-water resistance; unsuitable for ammonia service |
Cleaning & Compatibility
Clean copper-alloy mesh with mild detergent or dilute citric acid; avoid ammonia-based cleaners entirely. In contact with more noble metals in wet service the copper alloy becomes the sacrificial partner — isolate or accept the loss rate.
Comparable Alloys
Within the copper family: brass for economy and appearance, phosphor bronze for fatigue strength and marine air, pure copper where conductivity (EMI shielding) is the point. For structural filtration duties, stainless 304/316 is the usual alternative.
Specifications of Filter Discs Available in Brass
| 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 |