Rocker Lafil 300C PTFE-Coated Corrosion-Resistant Diaphragm Vacuum Pump

Overview

The Rocker Lafil 300C is an oil-free, PTFE-coated diaphragm vacuum pump engineered for precision and chemical resilience in demanding laboratory filtration and sampling workflows. Operating on positive displacement via a reinforced elastomeric diaphragm actuated by an eccentric cam mechanism, it delivers consistent vacuum generation without lubricating oil—eliminating oil carryover, vapor contamination, or routine oil maintenance. Its ultimate vacuum of –630 mmHg (equivalent to ~84 kPa absolute pressure) and stable flow rate of 20 L/min support rapid, reproducible vacuum-assisted procedures including membrane filtration, air sampling, and suspended solids analysis. Designed with industrial ergonomics and safety integration, the Lafil 300C integrates seamlessly with standard filter flask assemblies while minimizing benchtop footprint through its compact, self-contained architecture.

Key Features

• PTFE-coated wetted path: Both the diaphragm and internal pump chamber are fully coated with polytetrafluoroethylene (PTFE), ensuring resistance to aggressive solvents, acids, bases, and halogenated compounds commonly encountered in environmental, pharmaceutical, and quality control laboratories.
• Stainless steel (SUS316) valve plates: Critical gas-path components—including reed valves and valve seats—are fabricated from ASTM A276 Type 316 stainless steel, providing superior corrosion resistance and long-term mechanical stability under cyclic loading.
• Integrated thermal protection: A bimetallic overtemperature cut-off switch is embedded directly in the motor winding assembly. Should ambient conditions or prolonged duty cycles elevate internal temperature beyond safe thresholds, the pump automatically de-energizes and resumes operation only after passive cooling to nominal operating range.
• Compact, integrated system design: The Lafil 300C combines vacuum generation, pressure regulation, and flask stabilization into a single unit. Its recessed, fence-style bottle platform prevents accidental flask tipping during operation—a critical ergonomic enhancement for high-throughput filtration workflows.
• Vacuum regulation capability: An adjustable vacuum regulator valve enables precise control of suction pressure, allowing users to optimize filtration speed versus membrane integrity—particularly essential when handling fragile biological samples or low-pressure-sensitive filters.
• Low-noise, low-vibration operation: Engineered with balanced rotor dynamics and vibration-dampening housing, the pump operates at ≤50 dB(A) at 1 m distance—compliant with ISO 7779 and suitable for shared lab environments where acoustic comfort is prioritized.

Sample Compatibility & Compliance

The Lafil 300C is validated for use with standard glass and polypropylene filter flasks (up to 2 L capacity), compatible with all common membrane filter diameters (47 mm, 90 mm, and 142 mm). Its PTFE-wetted construction ensures compatibility with aqueous, organic, and mixed-phase samples per ASTM D5127 (Standard Guide for Selection of Vacuum Filtration Equipment) and ISO 7207-1 (Water Quality — Determination of Suspended Solids). The pump carries CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), conforms to RoHS 2011/65/EU restrictions on hazardous substances, and meets IP30 ingress protection requirements per IEC 60529—indicating protection against solid objects ≥2.5 mm but no liquid resistance. While not intrinsically rated for explosive atmospheres, its oil-free design inherently eliminates ignition risk associated with hydrocarbon vapors.

Software & Data Management

The Lafil 300C is a standalone, analog-operated instrument with no embedded microcontroller or digital interface. It does not incorporate data logging, USB connectivity, or remote control functionality. As such, it requires no software installation, firmware updates, or cybersecurity validation. This architecture aligns with GLP-compliant environments where device simplicity, deterministic behavior, and audit-trail transparency are prioritized over automation. All operational parameters—including vacuum setpoint, runtime, and duty cycle—are manually monitored using external analog gauges or inline pressure transducers. For laboratories requiring electronic recordkeeping, integration with third-party data acquisition systems (e.g., LabVIEW or SCADA platforms) is feasible via optional 4–20 mA or 0–10 V analog output modules (sold separately).

Applications

• Microbiological analysis: Membrane filtration of water, beverages, and pharmaceutical solutions per USP , EP 2.6.27, and ISO 9308-1 for total coliform and E. coli enumeration.
• Suspended solids quantification: Gravimetric determination of TSS in wastewater, surface water, and effluent streams in accordance with EPA Method 160.2 and ISO 11923.
• Vacuum-assisted sample preparation: Solvent removal prior to HPLC or GC analysis, lyophilization pre-concentration, and degassing of mobile phase solvents.
• Air and aerosol sampling: Collection of particulate matter (PM₁₀, PM_2.5) and bioaerosols onto gelatin or polycarbonate filters using calibrated flow controllers per ISO 10112 and EN 13205.
• Chemical synthesis support: Solvent reflux under reduced pressure, inert gas purging of reaction vessels, and vacuum drying of hygroscopic reagents.

FAQ

Is the Lafil 300C suitable for continuous-duty operation?
Yes—the pump is rated for intermittent and continuous operation up to 8 hours per day under ambient temperatures ≤35°C and relative humidity ≤80%. Extended operation beyond this requires periodic cooldown intervals to prevent thermal accumulation.
Can it be used with aggressive solvents like chloroform or concentrated nitric acid?
The PTFE coating and SUS316 valve components provide broad chemical resistance; however, prolonged exposure to strong oxidizers (e.g., fuming nitric acid) or halogenated solvents at elevated temperatures may degrade elastomeric seals over time. Consult Rocker’s Chemical Compatibility Guide for specific solvent exposure limits.
Does the unit include a built-in vacuum gauge?
No—the Lafil 300C does not feature an integrated pressure display. Users must employ an external analog or digital vacuum gauge connected via the dedicated pressure tap port.
What is the expected service life of the diaphragm under normal laboratory use?
Under typical usage (≤4 hrs/day, ambient conditions), the PTFE-reinforced diaphragm maintains functional integrity for ≥10,000 operating hours or approximately 3–5 years, depending on vacuum depth and chemical exposure profile.
Is the pump compliant with FDA 21 CFR Part 11 requirements?
As a non-computerized, non-data-generating device, the Lafil 300C falls outside the scope of 21 CFR Part 11. Its mechanical simplicity supports ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) when paired with paper-based or validated electronic lab notebook (ELN) documentation practices.