How to Select PP Filter Bags

Bag Filter August 29, 2025 Filter Bag

Reasonable Selection of Filtration Accuracy for Filter Bag

Example: For electronic cleaning water, 1 μm is sufficient; for pharmaceutical liquids, 0.5 μm may be required; for general fine chemical processes, 5–10 μm is more economical (to avoid excessive filtration that shortens filter bag service life).
Higher accuracy is not always better — it must be chosen based on actual needs.
Note: The “rated accuracy” of filter bags usually refers to either absolute accuracy (≥99% retention efficiency for particles ≥ the rated size) or nominal accuracy (lower retention efficiency). Requirements should be clarified in advance.

Flow Rate and System Pressure

High-accuracy filter bags have lower dirt-holding capacity (impurities easily clog micropores). Replacement frequency should be calculated based on impurity content, or a multi-bag configuration (e.g., 2-bag or 4-bag parallel units) should be selected to increase flow capacity.
System working pressure must be ≤ the filter housing’s design pressure (typically ≤0.6 MPa) to avoid bag rupture or housing leakage due to excessive pressure.

Industry Compliance

Food and pharmaceutical industries must use food-grade or pharmaceutical-grade materials (e.g., 304/316L stainless steel housing, non-fluorescent filter bags), with material certifications (such as FDA or USP Class VI).
Electronics industry must ensure that filter materials do not release particles or ions (e.g., low-metal-leaching stainless steel).