Lab Companion Temperature & Humidity Test Chamber | Ideal Solution for GB/T 2423.50-2025 Double 85 Testing

1. New Standard Update: GB/T 2423.50-2025 for Constant Humidity Accelerated Testing

Released on August 1, 2025 and officially enforced on February 1, 2026, GB/T 2423.50-2025 replaces the 2012 version and fully aligns with the international standard IEC 60068-2-67:2019. This specification defines the standardized test method for constant humidity accelerated aging of electronic components, widely known as the Double 85 Test.

The Double 85 Test operates at 85°C and 85% RH constant conditions. It effectively simulates long-term high-temperature and high-humidity aging in a short period, serving as the core reliability verification method for non-hermetic electronic components. It covers resistors, capacitors, inductors, semiconductor chips, ICs, optoelectronic devices, connectors and small electronic modules, applicable to consumer electronics, automotive electronics, industrial control, communication and medical equipment.

2. Core Challenges of the New Standard

Compared with the old version, GB/T 2423.50-2025 raises stricter requirements for test accuracy, long-term continuous operation and chamber uniformity. Most conventional environmental test chambers cannot meet the updated compliance criteria.

2.1 Strict Tolerance for High Humidity Working Conditions

The new standard specifies a tolerance of ±2°C for temperature and ±5% RH for humidity. The 85°C/85% RH extreme working condition easily causes humidity sensor drift and unstable steam supply in ordinary chambers, resulting in excessive humidity fluctuation and invalid test data.

2.2 Ultra-Long Continuous Operation Requirements

Four reliability severity levels are defined for accelerated aging evaluation:

• Level 1 (168 hours): General screening for consumer electronic components

• Level 2 (504 hours): High-reliability verification for automotive and industrial electronic parts

• Level 3 (1000 hours): Long-term stability test for communication and industrial core devices

• Level 4 (2000 hours): Extreme aging assessment for high-end medical and high-reliability electronic components

A maximum 2000-hour uninterrupted test requires stable humidification and refrigeration performance. Ordinary chambers suffer from scale blockage, decreased compressor efficiency and humidity drift after long-term operation, failing to complete full-cycle testing.

2.3 Higher Uniformity Requirements for Miniature Components

With electronic components trending toward miniaturization and high integration, tiny devices such as 0402 SMD resistors and BGA chips are extremely sensitive to spatial temperature and humidity deviation. Uneven chamber distribution leads to inconsistent stress on batch samples and poor test repeatability.

3. Lab Companion Chamber: Fully Compliant with GB/T 2423.50-2025

As a professional high-tech manufacturer with over 20 years of experience in environmental reliability testing equipment, Lab Companion provides full-spec compliant temperature and humidity test chambers for standardized Double 85 aging tests. All models pass CE certification and adopt internationally renowned components and mature industrial-grade design.

3.1 Full Parameter Coverage for Double 85 Working Conditions

Lab Companion chambers feature a wide temperature range of -70°C to +150°C and a humidity range of 20%–98% RH. The 85°C/85% RH condition is a stable conventional operating range, supporting long-term continuous aging tests. Multiple standard chamber volumes are available from 34L to 1500L, with customized sizes up to 8000L to meet diverse testing demands from small components to complete modules.

3.2 Precise Control Fully Meets Standard Tolerance

Equipped with the self-developed C100 PID + fuzzy logic control system, the chamber adopts independent dual-loop temperature and humidity control to eliminate coupling fluctuation. It achieves temperature fluctuation ≤0.5°C and temperature deviation of ±2°C. Under high humidity conditions (≥75% RH), the humidity deviation is stably controlled within±5% RH, fully complying with GB/T 2423.50-2025 tolerance requirements.

The system supports multi-language operation, self-check, automatic correction, timing start-stop and fault alarm, ensuring convenient operation and high test accuracy.

3.3 High-Stability Humidification & Refrigeration System for Long-Term Testing

Lab Companion adopts an integrated boiler humidification system. Compared with traditional shallow tray humidification, it delivers more stable steam supply, stronger anti-scale performance and better low/high humidity consistency, fully satisfying GB2423 series arbitrary curve tests and supporting 2000-hour uninterrupted Double 85 aging.

The refrigeration system applies the inverse Carnot cycle and Italian professional refrigeration technology. Equipped with world-class compressors (BITZER, GEA, Copeland) and precision control valves (Danfoss, Sporlan, Emerson), it uses eco-friendly refrigerants R404A and R23. Unique bypass adjustment and anti-liquid hammer design keep the compressor operating under optimal conditions, greatly improving stability and service life for long-cycle high-humidity testing.

3.4 Optimized Air Duct Design Ensures Batch Consistency

With an optimized circulating air duct and multi-point three-dimensional air supply structure, the chamber realizes uniform temperature and humidity distribution in the entire working space. It effectively eliminates regional deviation, ensures consistent environmental stress for batch samples, and guarantees highly repeatable and comparable test results for miniature and high-precision electronic components.

3.5 Complete Data Traceability for Laboratory Compliance

The C100 controller supports multi-segment program editing, cycle setting and real-time data storage. Users can preset standard test programs for 168h / 504h / 1000h / 2000h aging tests for one-click execution. The system records full-process data, trend curves and historical faults, providing complete traceable data for CNAS/CMA audit and official test reports.

3.6 Strict Quality Control & Comprehensive Safety Protection

All Lab Companion equipment is manufactured under ISO9001 and ISO14001 quality management systems. Adopting advanced laser cutting and CNC bending processing, every chamber undergoes strict factory debugging and non-fault aging tests. Core electrical components are supplied by SIEMENS, Schneider and ABB, ensuring long-term reliable operation.

Full safety protection is equipped, including compressor over-pressure/over-current/overheat protection, water shortage protection, over-temperature protection, leakage protection and phase sequence protection, ensuring safe operation for both equipment and operators. The equipment can stably operate at ambient temperature up to 38°C, adapting to various laboratory environments worldwide.

3.7 Global After-Sales Support

Lab Companion maintains professional service centers in Beijing, Shanghai, Chongqing, Wuhan, Xi’an, Hong Kong and other regions, providing fast global technical support, after-sales maintenance and calibration services to ensure stable and continuous customer testing.

4. Conclusion

With the official implementation of GB/T 2423.50-2025, compliant test equipment has become a mandatory requirement for electronic component reliability certification and laboratory audit. As a mature and reliable environmental test solution provider, Lab Companion offers high-precision, long-life and fully traceable temperature and humidity test chambers, perfectly matching the new Double 85 test standard. It helps global customers complete standardized accelerated aging tests and improve product environmental reliability and market competitiveness.