PP Folded Polypropylene Membrane Cartridge

Overview

The PP Folded Polypropylene Membrane Cartridge is a fixed-bed, depth-type filtration element engineered for high-reliability liquid and gas purification in regulated life science and industrial applications. Constructed with thermally bonded polypropylene (PP) composite membrane, it operates on the principle of mechanical sieving combined with adsorptive retention within a graded porosity matrix. Unlike surface filters, its folded pleated geometry maximizes effective filtration area (>0.50 m² for 10-inch format) while maintaining low differential pressure—enabling stable performance under variable feed pressures without compromising nominal retention efficiency. Designed for compatibility with pharmaceutical water systems (PW, WFI pre-filtration), bioprocessing streams, and sterile-grade final filtration, the cartridge delivers consistent particulate removal across a broad nominal pore size range—from 0.1 µm to 60 µm—while meeting critical requirements for extractables control, non-pyrogenicity, and integrity verifiability.

Key Features

• High-efficiency depth filtration architecture with >90% particle retention at rated nominal pore size
• Thermal bonding process eliminates adhesive use—ensuring zero leachables and compliance with USP and ISO 10993-5 for cytotoxicity
• Low ΔP design: maximum forward pressure drop ≤0.42 MPa at 25°C; reverse pressure tolerance ≤0.21 MPa
• Chemical resistance validated against common solvents, acids, bases, and cleaning agents per manufacturer’s chemical compatibility guide
• Steam-in-place (SIP) capable: withstands 121°C, 0.1 MPa saturated steam for 30 minutes—validated for ≥30 cycles without structural degradation
• No fiber shedding or media migration—certified non-fibrous per ASTM F838-22 challenge testing
• Reusable after validated cleaning protocols (CIP) using compatible sanitants such as NaOH or hydrogen peroxide
• Integrity testable via forward-flow or bubble point methods per ASTM F316-22 and ISO 15883-5

Sample Compatibility & Compliance

The cartridge supports filtration of aqueous solutions, organic solvents, compressed gases, and viscous biopharmaceutical intermediates—including cell culture harvests, buffer solutions, and formulated drug products. It complies with core regulatory expectations for single-use and reusable filtration components in GMP environments: adherence to ISO 9001 manufacturing controls, full traceability of raw materials (e.g., imported polyester support web, medical-grade silicone or FKM O-rings), and documentation packages supporting FDA 21 CFR Part 11-compliant electronic records. All standard configurations meet USP Class VI biological safety requirements and are suitable for use in processes governed by ICH Q5A, Q5D, and Annex 1 (EU GMP) for sterile filtration risk mitigation.

Software & Data Management

While the cartridge itself is a passive hardware component, its integration into automated filtration skids or bioreactor trains enables seamless data capture via industry-standard communication protocols (Modbus TCP, Profibus DP). When paired with digital pressure transducers and flow meters, real-time ΔP trending, cycle count logging, and integrity test result archiving can be incorporated into MES or SCADA platforms. Full audit trails—including SIP cycle timestamps, temperature/pressure profiles, and post-use integrity test outcomes—are exportable in CSV or PDF formats to satisfy GLP/GMP documentation requirements and facilitate regulatory inspection readiness.

Applications

• Pretreatment of reverse osmosis (RO) and deionized (DI) water systems in pharmaceutical facilities
• Final particulate polishing of injectables, ophthalmic solutions, and parenteral nutrition formulations
• Filtration of fermentation broths, clarified monoclonal antibody harvests, and viral vector preparations
• Clarification of beverages (beer, wine, fruit juices), edible oils, and food-grade syrups
• Removal of catalyst residues and fine precipitates from fine chemical synthesis streams
• Particulate control in compressed air and nitrogen lines used in aseptic filling suites
• Pre-filtration for downstream ultrafiltration/diafiltration cassettes in biomanufacturing

FAQ

What integrity test methods are recommended for this cartridge?
Bubble point and forward-flow tests per ASTM F316-22 are validated for all pore sizes; minimum bubble point values are provided in product specifications (e.g., ≥0.025 MPa for 0.1 µm grade).
Can this cartridge be sterilized using gamma irradiation?
Yes—gamma irradiation up to 25 kGy is compatible with PP and PVDF configurations; however, elastomer seals (silicone/FKM) must be selected per irradiation dose and shelf-life requirements.
Is the cartridge suitable for high-viscosity fluids?
It is rated for liquids with dynamic viscosities up to 50 cP at operating temperatures; for higher viscosities, consult flow-pressure drop curves and consider larger diameter or dual-cartridge arrangements.
How many SIP cycles can the cartridge endure before replacement?
Validated for ≥30 cycles at 121°C/0.1 MPa; replacement is triggered when ΔP exceeds 0.25 MPa under defined flow conditions or after integrity failure.
Does the cartridge require pre-wetting with alcohol for hydrophobic applications?
Hydrophilic PP variants do not require pre-wetting; hydrophobic versions (e.g., PVDF-based) necessitate 70% IPA wetting prior to aqueous service to ensure complete pore penetration.