LH-010 / LH-225 High-Temperature Aging Test Chamber

Overview

The LH-010 and LH-225 High-Temperature Aging Test Chambers are precision-engineered environmental test systems designed for accelerated thermal aging of polymeric materials, elastomers, insulating compounds, and cable sheathing per internationally recognized standards. These chambers operate on forced-air convection principles, utilizing a high-stability heating system coupled with a dynamically adjustable air exchange mechanism to simulate long-term thermal degradation under controlled, reproducible conditions. The core measurement objective is not real-time property quantification but rather the induction of time-accelerated material changes—such as oxidation, cross-linking, or chain scission—enabling predictive lifetime assessment in accordance with ASTM D573, ISO 188, and IEC 60540 methodologies. Designed for laboratory-based quality assurance and R&D validation workflows, the LH series supports both static and rotational sample exposure protocols, ensuring representative surface conditioning across heterogeneous specimens.

Key Features

• Robust dual-layer construction: Interior chamber fabricated from electropolished 304 stainless steel for corrosion resistance and ease of cleaning; exterior housing formed from cold-rolled steel with durable epoxy-polyester powder coating.
• Intelligent microprocessor-based temperature controller with PID algorithm, integrated digital timer (up to 999 hours), and real-time deviation alarm functionality.
• High-efficiency axial fan assembly rated for continuous operation at 200°C, paired with optimized baffle-guided airflow ducting to achieve ≤ ±1.5°C spatial uniformity across the working volume.
• Adjustable forced ventilation system enabling precise control of air exchange rate between 10 and 300 cycles per hour—critical for replicating oxidative aging kinetics in thermoplastic and elastomeric formulations.
• Dual-stage overtemperature protection: Primary electronic cut-off triggered at user-defined setpoint +5°C; secondary independent mechanical thermostat acting as fail-safe redundancy.
• Motor-driven rotating sample rack (10–12 rpm) ensures uniform thermal exposure on all specimen surfaces—particularly essential for asymmetric or multi-layer cable samples per IEC 60540 Clause 8.2.

Sample Compatibility & Compliance

The LH series accommodates standard test specimens including rubber strips (ASTM D573), insulated wire segments (IEC 60540), plastic films, and molded polymer parts up to 300 mm × 300 mm × 300 mm (LH-010) or 500 mm × 600 mm × 750 mm (LH-225). All operational parameters—including temperature ramp profiles, dwell times, and air exchange settings—are fully configurable to align with test plans defined in JB/T 7444–1994 (Chinese national standard for high-temperature aging chambers), ISO 188:2011 (rubber—accelerated ageing), and USP (thermal stability testing of pharmaceutical packaging components). The chamber’s design supports GLP-compliant documentation when paired with external data loggers meeting FDA 21 CFR Part 11 audit trail requirements.

Software & Data Management

While the LH series operates via embedded hardware controller without proprietary PC software, it provides analog voltage output (0–5 V DC) and RS485 Modbus RTU interface for integration into centralized laboratory monitoring systems (e.g., LabVIEW, Ignition SCADA, or custom LIMS platforms). Temperature setpoints, runtime, and alarm events are stored in non-volatile memory with timestamping. For full traceability, users may connect calibrated external data loggers equipped with NIST-traceable Class A PT100 sensors to record continuous temperature profiles—supporting internal QA audits and regulatory submissions requiring documented thermal history.

Applications

• Accelerated aging validation of PVC, PE, EPDM, and silicone insulation in low- and medium-voltage power cables.
• Thermal stability screening of automotive interior polymers under SAE J2236 and GMW15635 specifications.
• Pre-qualification testing of medical device packaging materials per ISO 11607–2 Annex C.
• Research-grade investigation of oxidative induction time (OIT) in polyolefins using gravimetric mass-loss correlation.
• Compliance verification for RoHS-compliant flame-retardant compounds exposed to elevated ambient storage conditions.

FAQ

What standards does the LH series explicitly support?
JB/T 7444–1994, IEC 60540, ISO 188:2011, ASTM D573, and GB/T 2951.12–2008.
Is the air exchange rate independently controllable during temperature ramping?
Yes—the ventilation system remains fully operational and adjustable throughout all phases of the thermal cycle, including ramp, dwell, and cooldown stages.
Can the chamber be used for humidity-controlled aging tests?
No—this model is strictly a dry-heat aging chamber. Humidity control requires a dedicated combined environmental test chamber (e.g., temperature + humidity profiled units).
What maintenance intervals are recommended for sustained accuracy?
Calibration of the internal temperature sensor against a NIST-traceable reference probe is advised every 6 months; fan motor lubrication and filter inspection should occur quarterly.
Does the rotation function accommodate custom fixture mounting?
Yes—the 10–12 rpm turntable features threaded M6 mounting holes on its upper surface, allowing secure attachment of application-specific sample holders or jigs.