Rocker LF32 Sterilizable Filtration Assembly

Overview

The Rocker LF32 Sterilizable Filtration Assembly is a high-integrity, modular vacuum filtration system engineered for demanding life science and bioprocessing applications requiring repeated sterilization, chemical resistance, and operational reliability. Designed around Couette-flow–compatible vacuum-driven membrane filtration principles, the LF32 integrates a precision-machined SUS316 stainless steel funnel assembly with a thermally stable polyethersulfone (PES) receiver bottle — both validated for repeated autoclaving (121°C, 30 min, ≥100 cycles) and dry-heat sterilization (180°C). Its architecture eliminates reliance on external clamps or O-rings subject to creep deformation, instead utilizing Rocker’s proprietary M381450 twist-lock coupling mechanism to ensure leak-tight sealing under vacuum pressures up to –95 kPa. The system complies with ISO 8573-1 Class 3 compressed air purity requirements when used with oil-free vacuum sources and meets material biocompatibility criteria per USP and cytotoxicity testing protocols.

Key Features

• SUS316 stainless steel filtration funnel (100 mL capacity) with electropolished interior surface finish (Ra ≤ 0.4 µm) for minimal protein adsorption and enhanced cleanability
• Polyethersulfone (PES) receiver bottle (1200 mL) rated for continuous use at 180°C and validated for ≥100 autoclave cycles without dimensional drift or hydrolytic degradation
• M381450 twist-lock coupling system enabling tool-free, repeatable assembly with torque-controlled engagement (±5% tolerance) and visual alignment indexing
• Integrated overflow protection: hydrophobic vent valve with capillary cutoff mechanism prevents filtrate overdraw and vacuum line contamination during unattended operation
• Modular waste extraction adapter (PP) allows rapid reconfiguration of the receiver bottle into a dedicated waste collection vessel without disassembly of the filtration train
• Full-material traceability: all metallic components conform to ASTM F138 (implant-grade stainless steel); silicone gaskets comply with FDA 21 CFR 177.2300; PES resin certified to ISO 10993-5 cytotoxicity standards

Sample Compatibility & Compliance

The LF32 supports filtration of aqueous buffers, organic solvents (including ethanol, acetone, and ethyl acetate), acidic/basic solutions (pH 1–13), and viscous biological suspensions (e.g., cell lysates, clarified fermentation broths). Its SUS316 wetted path resists pitting corrosion in chloride-rich media (tested per ASTM G48 Method A), while the PES bottle maintains mechanical integrity after exposure to 30% hydrogen peroxide vapor (VHP) sterilization. System validation documentation includes extractables profiling per USP , particulate shedding assessment per ISO 8573-1, and endotoxin recovery testing (<0.03 EU/mL). The assembly is compatible with GLP/GMP environments and supports audit-ready records when paired with Rocker’s optional digital vacuum controller (Model VAC-3000) featuring 21 CFR Part 11–compliant electronic signatures and audit trail logging.

Software & Data Management

While the LF32 operates as a standalone hardware system, it is fully interoperable with Rocker’s VAC-3000 Smart Vacuum Controller platform. This controller provides real-time monitoring of vacuum pressure, filtration time, and cycle count via Bluetooth 5.0 or RS-485 interface. All operational parameters are timestamped and stored locally with tamper-evident encryption; data export is supported in CSV and PDF formats compliant with ALCOA+ data integrity principles. When integrated into automated workflows, the VAC-3000 enables programmable pressure ramping, endpoint detection via pressure differential thresholds, and automatic shutdown upon completion or overflow event — fulfilling critical process control requirements outlined in ICH Q5A(R2) and ISO 20387 biobanking standards.

Applications

• Pre-sterilization clarification of culture media, sera, and recombinant protein formulations prior to aseptic filling
• Microbial retention testing (ASTM F838-22) using 0.22 µm PVDF or PES membranes for pharmaceutical water system validation
• High-temperature solvent filtration in synthetic chemistry labs where flame or oven sterilization of funnels is routine
• Bioburden reduction in raw material processing for cell and gene therapy manufacturing (CGT)
• Environmental microbiology: concentration of waterborne pathogens (e.g., Legionella, Pseudomonas) from large-volume samples (up to 1 L) using 47 mm membrane supports
• QC/QA laboratories performing filter integrity testing (forward flow, bubble point) per ASTM F3154-18

FAQ

Can the LF32 filtration funnel be sterilized using dry heat at 180°C?
Yes — the SUS316 stainless steel construction and electropolished surface allow validated dry-heat sterilization at 180°C for 60 minutes without loss of dimensional stability or surface passivation.
Is the PES receiver bottle compatible with gamma irradiation?
No — gamma irradiation induces chain scission in PES; only steam autoclaving and dry-heat methods are validated for this component.
What is the maximum recommended vacuum pressure for continuous operation?
–95 kPa (absolute) at 25°C ambient; sustained operation above –90 kPa requires active cooling of the vacuum pump to prevent backstreaming.
Does the M381450 coupling meet ISO 8536-4 sterility barrier requirements?
Yes — the twist-lock interface achieves a microbial ingress protection rating equivalent to ISO 8536-4 Class B when assembled with specified torque and used with sterile-grade membrane discs.
Are replacement parts available with full material certifications (CoA, CoC)?
Yes — all consumables (silicone gaskets, PP adapters, SUS316 support plates) ship with lot-specific Certificates of Analysis and Conformance aligned to ISO 9001:2015 and ISO 13485:2016 quality management systems.