How to Check a Filter Bag: FiltEdge’s Quality Standards
At FiltEdge, we believe that every dust filter bag is not just a component—but a critical link in ensuring clean air, safe production, and efficient operation.
Over the years, we’ve developed a complete inspection process to ensure that each filter bag meets the most demanding industrial conditions. Here’s how to properly check a filter bag for quality and performance:
1. Dimensional Accuracy
- Measure bag length, diameter, and seam positions.
- Check top and bottom designs (snap band, flange, raw edge) for compatibility with your cage and dust collector.
- FiltEdge ensures precise cutting with automatic cutting machines and tight tolerances in production.
2. Fabric Quality & Physical Properties
- Confirm the gram weight and thickness match specifications.
- Test tensile strength and elongation (both warp and weft directions).
- Verify thermal shrinkage performance at expected operating temperatures.
All FiltEdge filter media go through strict material selection and in-house testing before bag conversion.
3. Surface Treatment Integrity
- Inspect for proper singeing, glazing, calendering, or lamination finishes.
- Ensure film coating is smooth, continuous, and well-bonded—especially for PTFE laminated bags.
4. Air Permeability
- Use a permeability tester to confirm airflow under a defined pressure differential (e.g., 200 Pa).
- This is critical to balance filtration efficiency and energy consumption.
- FiltEdge targets ideal permeability ranges for each application (e.g, cement, steel, incineration).
5. Stitching & Seam Strength
- Check seam alignment, stitch density, and thread material.
- Test seam strength to prevent failure during pulsing or high airflow.
- For hot-gas applications, special high-temp threads or ultrasonic welding are available.
6. Compatibility with Dust Collector
- Perform a fit test using the actual cage and tube sheet.
- Confirm snap bands or rings hold tight, without leakage or gaps.
- FiltEdge offers full customization for collar type, gaskets, and length.
7. Batch Inspection & Certification
- Visual inspection for defects, holes, oil marks, or incomplete processing.
- Random batch sampling under ISO 9001 protocol.
- Optional third-party testing and material traceability upon request.
FiltEdge Promise
With over 17 years in the global dust filtration industry, FiltEdge delivers over 2,000 filter bags per day, with sample production in as fast as 1–7 days.
Our bags are trusted by dust collector OEMs and industrial plants across 50+ countries.
If you need assistance selecting or inspecting your filter bags, our technical team is always here to help.
FiltEdge Liquid Filter Quality Inspection Protocol
At FiltEdge, we adhere to the highest standards in the production and inspection of liquid filtration systems. Our goal is to ensure each filter unit meets both industry regulations and our clients’ performance expectations.
Key Inspection Procedures for Liquid Filters
1. Micron Rating Verification
Each liquid filter is tested to verify its nominal or absolute micron rating. Standard test liquids containing calibrated particles are used to ensure the filter meets its rated filtration precision.
2. Pressure Drop & Burst Pressure Test
- Initial Differential Pressure is measured at the rated flow rate to ensure energy efficiency.
- Burst Pressure Test ensures the housing withstands extreme operating conditions without structural failure.
3. Flow Rate Test
Verifies the flow capacity of the filter under standard pressure conditions. Ensures consistent throughput performance for critical applications in industries such as chemicals, automotive, and pharmaceuticals.
4. Integrity Testing (for high-purity filters)
Includes Bubble Point, Diffusion Flow, and Pressure Hold tests to confirm filter membrane integrity, especially for applications involving sterile or food-grade liquids.
5. Leakage and Seal Test
Checks for leaks at connection points and structural seams using pressurized air or fluid. Ensures leak-tight operation in pressurized systems.
6. Material Compatibility Test
Assesses the durability of filter materials when exposed to aggressive fluids such as acids, solvents, and high-temperature media.
7. Visual and Dimensional Inspection
Every filter undergoes visual checks for cracks, deformities, or contamination, and dimensional verification using precision tools.
8. Seal and End Cap Strength Test
Ensures bonding strength between filter media and end caps or seals, guaranteeing reliability during high-pressure operations.
FiltEdge Air Filter Quality Inspection Report
At FiltEdge, quality control is at the core of our production process. With state-of-the-art equipment and a dedicated testing team, we ensure every air filter meets the highest performance and safety standards. Below is a summary of our daily quality inspection procedures and production capacity.
- Datasheet
| Product Type | Daily Output (pcs) | Key Inspections |
| HEPA Filters | 300 | Particle count test (EN1822), Initial resistance, Efficiency, Leak test, Visual check |
| Bag Filters | 600 | Initial resistance, Dust holding capacity, Efficiency test (ISO 16890), Dimension check |
| Panel Filters | 500 | Visual inspection, Initial resistance, Filter material integrity, Frame sealing |
Each batch undergoes standardized testing in our ISO-compliant lab, including:
-Particle counter-based efficiency testing for HEPA and ULPA filters.
-Resistance and airflow calibration at rated speed.
-Dust loading simulation to assess holding capacity and filter lifespan.
-Visual and dimensional checks to verify assembly precision and material integrity.
Leak test and frame sealing inspections for critical performance filters.
Our commitment is simple: to deliver air filters that perform reliably under demanding industrial conditions. With over a decade of experience and hundreds of clients globally, FiltEdge stands for precision, trust, and performance.
FiltEdge Quality Control FAQ
Production Quality Assurance
Our facility is ISO 9001 certified and equipped with standardized production lines. We implement a multi-layered quality control system:
– All raw materials undergo initial inspection and testing (color, fiber length, crimp, fineness, and air permeability).
– Each production step is followed by a secondary quality check by the next operator.
– Supervisors monitor key workstations, and our final QC team performs random sampling and performance testing—especially for critical components like filter bag fitment with the flower plate.
– Automated production ensures consistent output, while suspended conveyor systems assign one person to one process for maximum stability.
– Suppliers provide inspection certificates, but we also run independent lab tests on fiber curl, strength, thickness, air permeability, and temperature resistance.
– We test each batch of fabric in-house before it is approved for further processing.
– Tests include:
– Fabric strength and air permeability
– Bag length, width, seam consistency, stitch integrity
– Flower plate fit testing
– Elongation strength test
– Packaging integrity
– Each checkpoint follows a three-level inspection model: operator, supervisor, and final QC.
– Every batch is sampled and inspected before shipment.
– Optional third-party inspections (e.g. SGS, BV) can be arranged per customer request.
– We work closely with our machine manufacturers to ensure preventive maintenance and operator training are performed regularly to minimize downtime and quality variation.
Global Trade Quality Control
– We’ve developed long-term partnerships with the best suppliers across China.
– A supplier grading system is in place based on delivery performance, product quality, and service response.
– Dedicated QA personnel inspect all incoming OEM/ODM parts following a detailed checklist.
– Inspection photos are sent to clients for full transparency.
– Yes. Outbound goods are sampled, tested, and photographed.
– For key customers or sensitive products, third-party preshipment inspection can be arranged.
– We provide FDA- and CE-compliant filters upon request, especially for use in food processing and pharmaceutical industries.
– We provide all certificates including Certificate of Origin, Quality Certificates, Packing Lists, and Commercial Invoices.
– Documents are carefully reviewed before shipping to ensure customs compliance.
– Yes. Our experienced merchandisers convert customer requests into technical files.
– Sample confirmation runs are conducted before mass production.
– Weekly quality meetings are held to review complaints, identify root causes, and implement corrective actions.
– Continuous investment in automation and digitization ensures that we evolve alongside market expectations.
