OK-TH-225 Rubber-Specific Temperature and Humidity Controlled Environmental Test Chamber

Overview

The OK-TH-225 Rubber-Specific Temperature and Humidity Controlled Environmental Test Chamber is an engineered solution for accelerated aging, physical property evaluation, and stability assessment of elastomeric materials under precisely regulated thermal and hygrothermal conditions. Designed in accordance with the fundamental principles of environmental simulation—namely, forced-air convection, PID-controlled refrigeration/heating cycles, and dual-chamber humidity generation via steam injection or ultrasonic humidification—the chamber delivers high reproducibility in long-duration exposure tests. Its architecture prioritizes thermal inertia minimization and spatial efficiency, enabling integration into compact R&D laboratories while maintaining compliance with international test standards for rubber compound validation. The system operates on a closed-loop feedback control paradigm, where real-time sensor data from multiple internal probe locations (including chamber air, sample surface, and dew point) feed into the TEMI880 controller to dynamically adjust compressor output, heater duty cycle, and humidifier power—ensuring stable setpoint maintenance across wide operational ranges.

Key Features

• Space-optimized footprint: Engineered for installation in constrained laboratory environments without compromising internal volume (225 L net capacity).
• Large observation window with double-layer low-emissivity tempered glass: Enables continuous visual monitoring of specimen deformation, cracking, or surface degradation during dynamic temperature/humidity cycling.
• High-capacity, drawer-style water reservoir: Supports extended unattended operation; facilitates rapid drainage and cleaning to prevent microbial growth and mineral buildup.
• Multi-tier safety architecture: Includes over-temperature cutoff, compressor high-pressure shutdown, humidity sensor failure detection, door interlock, and independent mechanical thermostat backup.
• Intuitive TEMI880 color touchscreen interface: Supports up to 100 programmable test profiles, each with ≥99 segments; features real-time trend graphs, alarm history logging, and USB data export.
• Robust construction: Interior chamber fabricated from electropolished SUS304 stainless steel (corrosion-resistant to ozone, nitric acid vapors, and sulfur-containing aging atmospheres); exterior available in either SUS304 or A3 steel with epoxy-polyester powder coating.

Sample Compatibility & Compliance

The OK-TH-225 accommodates standard rubber test specimens per ISO 37, ASTM D412, and GB/T 528—including dumbbell-shaped tensile bars, compression sets, O-rings, and vulcanized sheet samples up to 300 mm × 300 mm × 50 mm. It supports both static exposure (e.g., ISO 1431-1 ozone resistance) and dynamic cycling protocols (e.g., ISO 2231 temperature-humidity ramping). All performance specifications—including temperature uniformity (±0.5 °C), humidity deviation (≤±2.5 % RH), and ramp rates—are validated under no-load, ambient-conditioned (25 °C ±6 °C) calibration per GB/T 5170.2 and GB/T 5170.5. The chamber meets requirements for GLP-compliant testing environments when paired with optional audit-trail-enabled firmware and external calibration traceability documentation. It is certified to relevant national standards including GB10589 (low-temperature), GB10592 (climatic), GB11158 (high-temperature), and GB2423 series (environmental testing methods).

Software & Data Management

The TEMI880 controller provides native support for test sequence programming, real-time parameter visualization, and event-triggered data capture. Optional PC-based software (OK-EnviroLink v3.2) enables remote monitoring via Ethernet, automated report generation (PDF/CSV), and integration with LIMS platforms through OPC UA or Modbus TCP protocols. Data integrity safeguards include password-protected user roles (operator, engineer, administrator), electronic signature capability, and time-stamped audit trails compliant with FDA 21 CFR Part 11 requirements when configured with digital certificate authentication. Calibration records, maintenance logs, and alarm histories are stored internally with battery-backed memory retention exceeding 10 years.

Applications

• Evaluation of vulcanization stability and post-cure behavior under elevated humidity and temperature.
• Accelerated aging of natural rubber (NR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), and ethylene propylene diene monomer (EPDM) per ASTM D573 and ISO 188.
• Compression set testing (ISO 815) under combined thermal stress and saturated vapor conditions.
• Adhesion durability assessment of rubber-to-metal bonded assemblies exposed to cyclic humidity gradients.
• Validation of sealant and gasket performance in automotive underhood or aerospace cabin environments.
• Support for IEC 60068-2-30 (damp heat, cyclic) and MIL-STD-810H Method 507.6 (humidity) qualification testing.

FAQ

What is the minimum achievable temperature with standard configuration?
The standard OK-TH-225 achieves −40 °C; −120 °C is available as an optional deep-cooling upgrade requiring cascade refrigeration and enhanced insulation.
Can the chamber be customized for non-standard specimen dimensions or mounting fixtures?
Yes—custom interior configurations, shelf layouts, and fixture-mounting rails are supported per customer mechanical drawings.
Is the TEMI880 controller compatible with third-party SCADA systems?
Yes—Modbus RTU (RS485) and Modbus TCP (Ethernet) communication protocols are built-in and configurable.
What cooling water specifications are required for optimal low-temperature performance?
A chilled water supply at 10–28 °C and 0.1–0.3 MPa pressure is mandatory for models equipped with water-cooled condensers to sustain rated cooling rates.
How frequently should calibration verification be performed?
Per ISO/IEC 17025 and internal quality procedures, quarterly verification using NIST-traceable dry-well calibrators and chilled mirror hygrometers is recommended.