Labthink VAC-V2 Oxygen Transmission Rate (OTR) Tester for Sausage Casings and Packaging Films
| Brand | Labthink |
|---|---|
| Model | VAC-V2 |
| Principle | Differential Pressure Method |
| Test Gases | O₂, N₂, CO₂ |
| Test Range | 0.05–50,000 cm³/m²·24h·0.1MPa (expandable to ≥500,000) |
| Sample Capacity | 3 independent chambers |
| Vacuum Resolution | 0.1 Pa |
| Chamber Vacuum Level | <20 Pa |
| Temperature Control | 5–95 °C (±0.1 °C) |
| Humidity Control | 0%RH, 2–98.5%RH, 100%RH (optional generator) (±1%RH) |
| Sample Diameter | Φ97 mm |
| Effective Area | 38.48 cm² |
| Pressure Range | −0.1 to +0.1 MPa |
| Gas Supply | 0.4–0.6 MPa via Φ6 mm polyurethane tubing |
| Power | 220VAC 50Hz / 120VAC 60Hz |
| Weight | 88 kg |
| Compliance | ISO 15105-1, ISO 2556, ASTM D1434, GB/T 1038-2000, JIS K7126-1, YBB00082003 |
Overview
The Labthink VAC-V2 Oxygen Transmission Rate (OTR) Tester is a precision differential pressure–based gas permeability instrument engineered for quantitative assessment of oxygen barrier performance in flexible packaging materials—particularly sausage casings, multilayer films, high-barrier laminates, foils, and rigid sheet substrates. Operating on the fundamental principle of Fick’s law of diffusion, the VAC-V2 measures the steady-state flux of oxygen across a conditioned test specimen under a controlled transmembrane partial pressure gradient. The system establishes a defined pressure differential between upper (high-pressure) and lower (vacuum) test chambers; oxygen molecules permeate from the high-pressure side through the film matrix into the evacuated chamber, where real-time pressure rise is detected by a high-sensitivity piezoresistive transducer. From this dynamic pressure response, the instrument calculates not only OTR but also derived transport parameters—including diffusion coefficient (D), solubility coefficient (S), and permeability coefficient (P)—using thermodynamically consistent models compliant with ISO 15105-1 Annex A.
Key Features
- Triple independent test chambers enable concurrent, statistically independent OTR measurements on up to three specimens—identical or dissimilar—without cross-contamination or thermal crosstalk.
- High-stability temperature control (5–95 °C, ±0.1 °C) and optional humidity regulation (2–98.5%RH, ±1%RH) allow precise simulation of end-use environmental conditions per ASTM D1434 and ISO 2556 protocols.
- Dual-mode test logic—proportional control and fuzzy inference—ensures robust convergence across wide permeability ranges, from ultra-high-barrier ethylene-vinyl alcohol (EVOH) films (10,000 cm³/m²·24h·0.1MPa).
- Expandable measurement range supports extended calibration up to ≥500,000 cm³/m²·24h·0.1MPa for low-barrier industrial liners or blister packaging validation.
- Integrated vacuum architecture achieves <20 Pa base pressure with 0.1 Pa resolution, minimizing background drift and enabling accurate low-flux detection critical for pharmaceutical and medical device packaging qualification.
- Configurable gas compatibility: validated for O₂, N₂, and CO₂; modifications available for toxic or flammable gases (e.g., H₂S, CH₄) subject to safety certification and hardware retrofitting.
Sample Compatibility & Compliance
The VAC-V2 accommodates circular specimens (Φ97 mm) with an effective test area of 38.48 cm²—optimized for standard sausage casing widths and common lab-scale packaging film samples. It supports both dry and conditioned testing per USP and ISO 2233, with optional humidity generation enabling evaluation of moisture-dependent barrier degradation in hydrophilic polymers (e.g., PVOH, PLA). All operational modes adhere to internationally recognized standards including ISO 15105-1 (plastics—film and sheeting—determination of gas-transmission rate—part 1: differential pressure method), ASTM D1434 (standard test method for determining gas permeability characteristics of plastic film and sheeting), and Chinese pharmacopoeial standard YBB00082003 (oxygen permeation test for pharmaceutical packaging materials). Data integrity meets GLP/GMP expectations with full audit trail support in Lystem™ software, including user authentication, electronic signatures, and 21 CFR Part 11–compliant metadata logging.
Software & Data Management
Lystem™ Laboratory Data Management System (v4.0+) provides full instrument control, real-time curve visualization, and automated report generation in PDF/Excel formats. The software implements ISO/IEC 17025–aligned uncertainty propagation algorithms for OTR, D, S, and P values, incorporating temperature, pressure, and time-domain error weighting. Raw sensor data—including pressure vs. time profiles and chamber temperature/humidity logs—are stored with timestamped metadata and SHA-256 checksums. Integration with enterprise LIMS environments is supported via RS232 serial interface and TCP/IP-enabled API modules. Calibration traceability is maintained using certified reference membranes (NIST-traceable OTR standards), with automatic recalibration prompts triggered by usage thresholds or scheduled intervals.
Applications
- Quality assurance of collagen, cellulose, and synthetic sausage casings for oxygen-induced lipid oxidation prevention in cured meat products.
- Development and validation of retortable and aseptic packaging structures for shelf-stable foods and beverages.
- Regulatory submission support for FDA 510(k), EU MDR, and CFDA packaging dossiers requiring barrier performance evidence.
- Accelerated aging studies correlating OTR shift with thermal history, UV exposure, or sterilization cycles (EO, gamma, steam).
- Comparative analysis of nanocomposite films, SiOₓ/PVDC coatings, and metallized PET substrates under variable RH conditions.
FAQ
What gases can be tested besides oxygen?
The VAC-V2 is factory-calibrated for O₂, N₂, and CO₂. Other gases—including H₂, He, and CH₄—require hardware modification, gas-specific calibration, and adherence to local hazardous material handling regulations.
Is humidity control built-in or optional?
Humidity generation is an optional accessory; the base system supports only dry (0%RH) and ambient-humidity testing. The integrated humidity module enables precise RH setpoints from 2% to 98.5% with ±1%RH accuracy.
Can the instrument perform diffusion/solubility coefficient calculations automatically?
Yes. Upon completion of an OTR test at two or more temperatures, the software performs Arrhenius-based data fitting to compute activation energy, diffusion coefficient (D), solubility coefficient (S), and permeability coefficient (P) per ISO 15105-1 Annex A.
Does the system meet FDA 21 CFR Part 11 requirements?
When operated with Lystem™ v4.0+ and configured with role-based access control, electronic signatures, and immutable audit trails, the VAC-V2 satisfies core technical requirements of 21 CFR Part 11 for regulated pharmaceutical and medical packaging laboratories.
What vacuum pump is included?
A maintenance-free, oil-less diaphragm vacuum pump (imported) is supplied as standard equipment, rated for continuous operation down to <20 Pa and compatible with aggressive test gases when paired with appropriate filtration.
