High-Temperature, High-Humidity, and High-Salinity Environmental Test Chamber – OK-FH Series (NSS/CASS Compliant)
| Key Features | Temperature Range: +5°C to 55°C |
|---|---|
| Humidity Range | 85–95% RH |
| Temperature Uniformity | ≤ ±2°C |
| Temperature Stability | ≤ ±0.5°C |
| Salt Spray Deposition Rate | 1–2 mL/80 cm²·h |
| Spray Modes | Continuous or Cyclic |
| Test Timing | 1–999 sec/min/hr (adjustable) |
| Chamber Construction | 6 mm PVC-coated chamber walls (heat-resistant to 80°C), SUS#304 stainless steel saturated air tank, transparent acrylic impact-resistant lid |
| Air Supply System | Two-stage pressure regulation (1 kg/cm²), integrated particulate filtration |
| Sample Rack | Adjustable flat-angle fixture (15°/30°), multi-directional fog exposure |
| Compliance | Designed per CNS, JIS Z 2371, ASTM B117 (NSS), ASTM G85 Annex A2 (CASS) |
| Models | OK-FH-150B / OK-FH-250B / OK-FH-750B |
| Power Consumption | 1.3 kW / 1.5 kW / 1.8 kW |
Overview
The OK-FH Series High-Temperature, High-Humidity, and High-Salinity Environmental Test Chamber is an engineered solution for accelerated corrosion testing under rigorously controlled climatic conditions. Based on the fundamental principles of electrochemical corrosion acceleration—where elevated temperature, saturated humidity, and chloride ion concentration synergistically promote surface degradation—the chamber replicates aggressive service environments encountered in marine, coastal, automotive, and aerospace applications. It supports standardized salt spray protocols including Neutral Salt Spray (NSS) per ASTM B117 and Copper-Accelerated Acetic Acid Salt Spray (CASS) per ASTM G85 Annex A2, as well as JIS Z 2371 and CNS standards. Unlike generic humidity chambers, the OK-FH integrates precise thermal management of both test chamber and saturated air reservoir, enabling stable operation at 35°C ±1°C (NSS) or 50°C ±1°C (CASS), with corresponding saturation temperatures of 47°C ±1°C and 63°C ±1°C—critical parameters governing fog droplet size distribution and deposition kinetics.
Key Features
- Triple-condition control architecture: Independent regulation of chamber temperature (+5°C to 55°C), relative humidity (85–95% RH), and salt fog generation intensity.
- Thermally optimized chamber construction: 6 mm thick PVC-coated interior panels rated for continuous operation up to 80°C; seamless welds and reinforced sealing minimize vapor leakage and thermal drift.
- SUS#304 stainless steel saturated air tank: Pressure-rated design ensures long-term resistance to chloride-induced stress corrosion cracking; integrated insulation maintains precise saturation temperature stability (±1°C).
- Two-stage compressed air supply system: Primary coarse regulation followed by fine-tuned precision adjustment (1 kg/cm² nominal output), coupled with multi-stage particulate filtration to eliminate oil, moisture, and contaminants that could interfere with fog uniformity.
- Adjustable planar sample rack: Supports 15° and 30° inclination angles to accommodate varied specimen geometries and ensure consistent four-directional fog exposure—critical for evaluating coating adhesion and crevice corrosion susceptibility.
- Intelligent controller with programmable logic: Enables fully automated sequencing across multiple test phases (e.g., pre-conditioning humidification → salt spray → drying → recovery), with real-time logging of chamber setpoints and actuator status.
Sample Compatibility & Compliance
The OK-FH series accommodates a broad range of metallic and coated specimens—including steel substrates, aluminum alloys, zinc-plated fasteners, painted automotive components, and printed circuit board assemblies—without requiring custom fixtures. Its internal dimensions (up to 750 × 1100 × 500 mm W×D×H) support large-format panels or stacked test arrays while maintaining uniform fog distribution per ISO 9227 Annex B requirements. All models are configured to meet mandatory calibration traceability frameworks: temperature sensors conform to IEC 60751 Class A tolerance; humidity sensors comply with ISO 17025-accredited calibration intervals. The system supports audit-ready documentation for GLP and ISO/IEC 17025 laboratories, and its operational envelope aligns with regulatory expectations for corrosion validation in automotive OEM specifications (e.g., GMW 14872, Ford CETP 00.00-L-467) and defense standards (MIL-STD-810H Method 509.6).
Software & Data Management
Equipped with embedded industrial-grade controller firmware (no external PC dependency), the OK-FH provides local data storage for ≥30 days of continuous timestamped records—including chamber temperature, humidity, saturation temperature, spray duration, and cycle count. Optional RS-485/Modbus RTU or Ethernet TCP/IP interface enables integration into centralized lab monitoring systems (e.g., LabVantage, Siemens Desigo, or custom SCADA). Exported CSV logs include ISO 8601 timestamps and unit-annotated values, facilitating direct import into statistical process control (SPC) platforms. While not FDA 21 CFR Part 11-compliant out-of-the-box, the system supports third-party electronic signature and audit trail add-ons for regulated pharmaceutical or medical device qualification workflows where corrosion resistance of packaging or implantable device housings must be formally validated.
Applications
- Accelerated evaluation of anti-corrosion coatings (epoxy, zinc-nickel, chromate conversion) on structural steel used in offshore platforms.
- Qualification of solder mask integrity and copper trace corrosion resistance on high-reliability PCBs for avionics.
- Comparative lifetime modeling of fastener plating systems (e.g., trivalent chromium vs. hexavalent chromium alternatives) under cyclic salt-humidity stress.
- Validation of gasket material compatibility with saline fog ingress in NEMA 4X-rated enclosures.
- Supporting ASTM D1654 rating procedures for rust creepage and blistering assessment after scribe exposure.
FAQ
What standards does the OK-FH series explicitly support?
It is configured for full compliance with ASTM B117 (NSS), ASTM G85 Annex A2 (CASS), JIS Z 2371, and CNS 12227, with hardware-level calibration points traceable to national metrology institutes.
Can the chamber operate without salt spray—e.g., for pure high-humidity aging tests?
Yes. The system allows independent activation of humidity and heating functions; salt solution delivery is isolated via solenoid valve and can be fully deactivated.
Is the PVC chamber lining resistant to hydrochloric acid vapors generated during CASS testing?
The 6 mm PVC formulation includes UV-stabilized chlorinated polyvinyl chloride (CPVC) additives, providing verified resistance to HCl concentrations up to 0.1 mol/L at 63°C for extended exposure durations.
How is fog uniformity verified across the working volume?
Per ISO 9227, eight collection funnels are positioned on a 200 mm grid; deposition rate variance across all positions remains ≤15% when operated within specified air pressure and temperature tolerances.
Does the controller support multi-step test profiles with automatic transitions?
Yes. Up to 16 sequential steps—including soak, spray, dry, and recovery phases—can be programmed with independent time, temperature, humidity, and spray settings, executed without manual intervention.
