OK-HQ Series Automatic High-Temperature Air-Exchange Aging Chamber

Overview

The OK-HQ Series Automatic High-Temperature Air-Exchange Aging Chamber is an engineered environmental test system designed for accelerated thermal aging evaluation of polymeric, elastomeric, and insulating materials under controlled oxidative conditions. It operates on the principle of forced convection with programmable air exchange—introducing fresh ambient air at a precisely regulated rate into a thermally stabilized chamber while expelling heated, degraded air. This dynamic ventilation mimics real-world oxidative degradation mechanisms, enabling reliable assessment of material stability, embrittlement, discoloration, tensile loss, and insulation resistance decay over time. The chamber meets the core physical and operational requirements of ASTM D5423-09 (Type II laboratory ovens) and ASTM D5374-93 (2005) for electrical insulation testing, making it suitable for QC labs, R&D centers, and third-party certification facilities conducting compliance-driven aging protocols per UL 1581, IEC 60811, VDE 0472, and GB/T 2951 standards.

Key Features

• Precision-engineered air-exchange control system with digital flow regulation, supporting adjustable exchange rates from 2 to 100 cycles per hour and timing resolution down to 1 minute.
• Microprocessor-based PID temperature controller with LED display, offering setpoint resolution of 0.1°C and indication accuracy of ±0.1°C; integrated timer supports extended operation up to 9999 minutes.
• Horizontal forced-air circulation architecture featuring high-temperature-rated centrifugal blower and optimized baffle design ensures thermal uniformity of ±2°C across the working volume and stability of ±0.5°C during steady-state operation.
• Stainless steel (SUS304) interior chamber with argon-arc welded seams and mirror-finish surface resists oxidation and facilitates cleaning; exterior cabinet constructed from A3 steel with electrostatic powder coating for corrosion resistance and aesthetic durability.
• Insulation using high-density ultra-fine glass fiber cotton minimizes thermal leakage and improves energy efficiency without compromising structural integrity at elevated temperatures.
• Standard 50 mm diameter test port on left sidewall enables external signal or power feedthrough for in-situ monitoring (e.g., resistance, elongation, or voltage drop measurements during aging).
• Rotating turntable (diameters: Φ250–Φ700 mm) ensures uniform exposure of specimens to thermal and airflow gradients—critical for reproducible aging of cables, wire harnesses, and flat textile samples.

Sample Compatibility & Compliance

The OK-HQ chamber accommodates a broad range of specimen geometries—including insulated wires, rubber gaskets, plastic housings, fabric laminates, and molded elastomers—without requiring custom fixtures. Its horizontal airflow path and symmetrical internal geometry prevent localized overheating or stagnation zones, ensuring consistent aging kinetics across heterogeneous sample sets. The system is validated for use in GLP-compliant laboratories and supports audit-ready documentation when paired with external data loggers. It satisfies mandatory test conditions specified in UL 1581 Section 1060 (heat aging of wire insulation), IEC 60811-1-2 (aging in air-circulating ovens), and GB/T 2951.12 (electric cable insulation thermal aging). All models are CE-marked and conform to IEC 61000-4 electromagnetic compatibility requirements.

Software & Data Management

While the base configuration utilizes a standalone LED-PID controller, optional RS485/Modbus RTU interface enables integration with centralized lab management systems (LIMS) or SCADA platforms. When connected to compliant data acquisition hardware, the chamber supports electronic record generation with timestamped temperature logs, cycle counters, and alarm event history—fully traceable for FDA 21 CFR Part 11 compliance when implemented with appropriate user access controls and audit trail configuration. Optional PC-based software provides real-time graphing, export to CSV/PDF, and automated report generation aligned with ISO/IEC 17025 documentation frameworks.

Applications

• Accelerated aging of PVC, PE, XLPE, silicone rubber, and fluoropolymer insulation in wire and cable manufacturing.
• Thermal endurance evaluation of automotive gaskets, under-hood hoses, and battery pack sealing materials per SAE J2044 and ISO 6722.
• Pre-compliance screening of consumer electronics enclosures and connectors prior to formal UL or VDE certification.
• Material qualification for aerospace wiring (AS4373, MIL-W-22759) where oxygen diffusion-limited degradation must be replicated.
• Research on polymer chain scission kinetics, antioxidant depletion profiles, and crosslink density evolution via post-aging mechanical or FTIR analysis.

FAQ

What standards does this chamber specifically support for wire insulation testing?

It fully complies with ASTM D5423-09 (Type II), UL 1581 Section 1060, IEC 60811-1-2, and GB/T 2951.12 for heat aging of electrical insulating materials.

Can the air exchange rate be calibrated and verified independently?

Yes—the chamber includes provisions for installing certified anemometers or mass flow sensors at the intake/exhaust ducts; calibration procedures align with ISO 17025-accredited methods.

Is the rotating turntable speed adjustable?

No—the turntable operates at fixed low RPM to avoid vibration-induced thermal disturbance; speed is optimized for uniform exposure, not mechanical stress.

Does the system include data logging capability out of the box?

The standard unit features local LED display and relay-based alarms only; data logging requires optional communication module and external recording hardware.

What safety protections are built into the OK-HQ series?

Comprehensive safeguards include independent over-temperature cut-off, motor overheat protection, leakage current detection, short-circuit interruption, and phase-loss monitoring—all compliant with IEC 61000-4 and EN 61000-6-2.