ROCKER MF5 Magnetic Filter Holder

Overview

The ROCKER MF5 Magnetic Filter Holder is an engineered solution for rapid, secure, and repeatable vacuum-assisted membrane filtration in life science laboratories. Unlike conventional clamp-based or threaded filter holders, the MF5 employs a dual-layer neodymium magnet architecture to achieve instantaneous, tool-free membrane retention between the PES funnel body and base—eliminating torque variability, thread wear, and seal misalignment. Its operation relies on magnetic coupling rather than mechanical compression, ensuring consistent sealing force across repeated cycles while maintaining full compatibility with standard 47 mm diameter membranes (e.g., PES, PVDF, nylon, cellulose acetate). The system is designed for integration into routine sample preparation workflows including sterile filtration of cell culture media, clarification of protein solutions, particulate removal from buffers, and pre-filtration prior to HPLC or mass spectrometry analysis.

Key Features

• Dual-Stage Magnetic Coupling: Two concentric rare-earth magnets embedded in the base and funnel body generate uniform axial clamping force—ensuring >99.9% seal integrity without overtightening or operator-dependent torque.
• Single-Handed Operation: Full open/close cycle completed with one hand; no tools, no threading, no risk of cross-threading or cracked components.
• Integrated Membrane Alignment Ring: Precision-machined locating groove in the base ensures centric placement of 47 mm membranes—reducing edge folding, channeling, and premature breakthrough.
• Side-Mounted Vacuum Port: PES-built Luer-lock–compatible side port enables direct connection to vacuum tubing; eliminates need for dedicated vacuum flasks—supports use with serum bottles, borosilicate glass bottles, or waste containers (500 mL capacity).
• Autoclavable Construction: Entire assembly—including funnel, base, silicone O-rings, and PTFE-tipped lid tool—is rated for 20 minutes at 121°C under saturated steam pressure per ISO 17665-1, enabling reuse in GMP-aligned environments.
• Chemical Resilience: PES housing exhibits high resistance to alcohols, ketones, esters, and halogenated solvents—validated per ASTM D543 for immersion exposure up to 72 hours without dimensional or tensile degradation.

Sample Compatibility & Compliance

The MF5 accommodates all commercially available 47 mm membrane filters, including low-protein-binding PES, hydrophilic PVDF, and sterilizing-grade nylon variants. It supports filtration of aqueous buffers (PBS, Tris-HCl), biological supernatants, clarified lysates, and low-viscosity culture media (e.g., DMEM, RPMI-1640). The silicone rubber sealing system complies with USP Class VI biocompatibility requirements. As a non-electronic, non-calibrated device, the MF5 does not require regulatory certification under FDA 21 CFR Part 11; however, its design supports audit-ready documentation when used within GLP/GMP frameworks—particularly where traceability of filter lot numbers, sterilization cycles, and operator logs are maintained per SOPs.

Software & Data Management

The MF5 is a standalone mechanical filtration device with no embedded electronics, firmware, or software interface. All operational parameters—including membrane type, lot number, sterilization batch ID, vacuum pressure setting (via external regulator), and filtration duration—are recorded manually or integrated into existing LIMS or ELN platforms via standardized template fields. Its passive architecture ensures zero risk of electromagnetic interference, firmware obsolescence, or cybersecurity vulnerability—making it suitable for regulated QC labs operating under Annex 11 or ISO/IEC 17025 quality systems.

Applications

• Sterile filtration of cell culture media and reagents prior to aseptic processing
• Clarification of crude protein extracts before column chromatography
• Particulate removal from PCR master mixes and sequencing libraries
• Pre-filtration of mobile phase solvents in HPLC system priming protocols
• Routine buffer exchange and desalting in benchtop dialysis workflows
• Environmental water sample pre-filtration for microbial enumeration (ISO 9308-1)

FAQ

Can the MF5 be used with aggressive solvents such as DMSO or chloroform?
Yes—the PES body demonstrates compatibility with DMSO, acetone, ethyl acetate, and methanol per manufacturer chemical resistance charts; avoid prolonged contact with concentrated strong acids (e.g., >30% H₂SO₄) or oxidizers (e.g., undiluted HNO₃).
Is the silicone sealing ring replaceable?
Yes—silicone O-rings (ROCKER part #SEAL-MF5) are available separately and can be replaced after 25 autoclave cycles or visible compression set.
Does the MF5 meet ISO 9001 manufacturing standards?
ROCKER’s production facility is ISO 9001:2015 certified; each MF5 unit undergoes leak testing at 0.5 bar vacuum prior to packaging.
What is the maximum recommended vacuum pressure?
Operational limit is −0.95 bar (absolute); exceeding this may deform the silicone seal or cause membrane collapse—use inline vacuum regulators for controlled drawdown.
Can the MF5 be validated for endotoxin-free processing?
When autoclaved using depyrogenated water and stored in ISO Class 5 laminar flow cabinets, the MF5 meets USP endotoxin limits (<0.25 EU/mL) for filtered solutions.