What Are Key Selection Points for Filter Bags

Bag Filter August 25, 2025 Filter Bag

Material Compatibility of Filter Bags
The choice of filter bag material directly influences both filtration precision and chemical compatibility. Selection must be based on the characteristics of the processed medium:

Polyester (PET): Temperature resistance ≤130 °C; moderate acid and alkali resistance; suitable for most neutral liquids (e.g., food and beverage applications, water); cost-effective option.
Polypropylene (PP): Temperature resistance ≤80 °C; superior acid and alkali resistance compared with polyester; recommended for liquids with mild corrosive properties (e.g., cleaning solutions in the electronics industry).
PTFE (Polytetrafluoroethylene): Temperature resistance ≤260 °C; resistant to strong acids and alkalis (such as hydrofluoric acid and concentrated nitric acid); suitable for extreme operating conditions, though relatively high in cost.
Nylon: Excellent oil resistance; applicable to high-precision oil filtration (e.g., hydraulic oils); not suitable for strong acidic environments.

Core Advantages of High-Precision Bag Filters

High-precision bag filters are distinguished by their capability for “deep purification,” making them widely applicable in industries where sensitivity to impurities is critical:

Electronics Industry: For applications such as semiconductor wafer cleaning and photoresist filtration, ensuring the removal of particles ≥1 µm to prevent surface scratching of chips.
Pharmaceutical Industry: Pretreatment of pharmaceutical solutions and water for injection, compliant with GMP standards, effectively removing microbial carriers (e.g., particles <5 µm).
Food and Beverage Industry: Used in high-end beverage and edible oil filtration to eliminate colloids and suspended solids, thereby enhancing taste and extending shelf life.
Fine Chemicals: In coatings, inks, and adhesives filtration, preventing small particles from affecting product appearance (e.g., coating pinholes, printing defects).
Automotive Manufacturing: Applied in electrophoretic paint and cutting fluid filtration, ensuring smooth paint surfaces free from contaminants.