OK Environmental Test Chamber OK-TH-10 for Thermal Insulation Materials

Overview

The OK Environmental Test Chamber OK-TH-10 is a precision benchtop temperature and humidity controlled chamber engineered specifically for long-term environmental stress testing of thermal insulation materials—including expanded polystyrene (EPS), extruded polystyrene (XPS), polyurethane (PU) foam, mineral wool, glass wool, and vacuum insulated panels (VIPs). It operates on a dual-control principle: refrigeration via air-cooled compressor-based cooling, resistive electric heating, and steam-based humidification combined with condensation-driven dehumidification. This architecture enables stable, repeatable simulation of real-world climatic conditions—such as tropical high-humidity exposure (85 °C / 95 % RH), arctic dry cold (−40 °C / 20 % RH), and cyclic thermal shock—to evaluate dimensional stability, hygroscopic behavior, compressive strength retention, water vapor transmission rate (WVTR), and thermal conductivity drift under sustained environmental loading.

Key Features

• Benchtop form factor with compact internal volume (120 L) optimized for standardized insulation specimen testing per ASTM C177, ASTM C518, ISO 8301, and GB/T 10294.
• Dual-wall stainless steel inner chamber (SUS304) with high-efficiency polyurethane foam insulation—ensuring low thermal leakage and structural integrity during extended operation (>1,000 h continuous duty).
• Programmable touch-screen controller with multi-segment ramp-soak profiles; supports up to 99 cycles and 24 segments per program for simulating diurnal/seasonal variations.
• Integrated test port (Φ50 mm, sealed with silicone gasket) enabling in-situ insertion of thermal conductivity probes (e.g., heat flow meters or guarded hot plates) without interrupting chamber operation.
• Real-time sensor feedback loop with Pt100 temperature sensors and capacitive RH sensors calibrated traceably to NIST standards; data logging via USB interface with timestamped CSV export.
• Comprehensive safety system: over-temperature cut-off, refrigerant pressure monitoring, heater dry-run protection, fan failure detection, and automatic water-level alarm for the steam generator.

Sample Compatibility & Compliance

The OK-TH-10 accommodates standard insulation specimens up to 500 mm × 400 mm × 100 mm—fully compliant with sample size requirements defined in GB/T 8810 (water absorption), GB/T 8811 (dimensional stability), and ISO 29463-3 (filter media conditioning). Its internal stainless steel construction resists corrosion from volatile organic compounds (VOCs) or weak acidic vapors potentially emitted by aged polymer foams under humid heat. The chamber meets mechanical and electrical safety requirements per IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions), and supports GLP-compliant operation through configurable audit trails, user access levels, and password-protected parameter modification—aligned with FDA 21 CFR Part 11 principles for regulated R&D environments.

Software & Data Management

The embedded controller firmware provides native support for USB mass storage export of time-stamped temperature/humidity logs at user-defined intervals (1 s to 60 min resolution). Optional PC software (OK-EnvLog v2.1) enables post-test analysis: deviation mapping across the working zone, statistical process control (SPC) charts for uniformity validation, and overlay comparison of multiple test runs. All logged data includes metadata (operator ID, program name, calibration certificate ID), satisfying traceability requirements under ISO/IEC 17025 and CNAS accreditation frameworks. No cloud dependency—data remains fully on-device or locally exported, preserving confidentiality for proprietary formulation testing.

Applications

• Accelerated aging of building insulation materials under ISO 1182 and ASTM E84 pre-conditioning protocols prior to fire performance evaluation.
• Long-term thermal resistance (R-value) drift assessment per ASTM C1363 and EN 12664 using synchronized in-chamber heat flux measurement.
• Water vapor permeance testing of vapor retarders and sandwich panel facings per ASTM E96 and ISO 12572.
• Validation of low-emission formulations under elevated humidity (≥90 % RH) to assess off-gassing effects on adjacent materials.
• Quality assurance for production batches against internal specifications or customer-facing durability claims (e.g., “50-year service life under coastal conditions”).

FAQ

Does the OK-TH-10 support low-humidity operation below 20 % RH?
No—the chamber’s standard configuration achieves a minimum of 20 % RH using integrated refrigerative dehumidification. For sub-20 % RH applications (e.g., desiccated storage simulation), optional silica gel or membrane-based dry air purge modules are available as field-installable accessories.
Can the chamber maintain ±0.5 °C temperature uniformity across the full working volume?
Per ISO 16750-4 and IEC 60068-3-5 verification protocols, the OK-TH-10 achieves ≤±2 °C uniformity under standard loading (one 400 mm × 400 mm × 50 mm EPS slab centered on middle shelf). Achieving ±0.5 °C requires optional uniformity optimization kits (calibrated airflow diffusers + additional sensor nodes) and is validated separately per customer request.
Is third-party calibration included with purchase?
A factory calibration report (traceable to NIM, China) is supplied with each unit. Full ISO/IEC 17025-accredited on-site calibration by an accredited metrology lab is available as a billable service—not included in base pricing.
What maintenance intervals are recommended for uninterrupted operation?
Monthly cleaning of the steam generator tank and condenser coil; quarterly inspection of refrigerant charge and door seal integrity; annual recalibration of RH sensors and verification of temperature uniformity using a 9-point grid per IEC 60068-3-5 Annex B.
Can the controller interface with external LIMS or MES systems?
Yes—via Modbus RTU (RS-485) or optional Ethernet/IP gateway, enabling bidirectional communication for automated test initiation, status polling, and raw data ingestion into enterprise quality management platforms.