OK-HAST-25 High-Accelerated Stress Test (HAST) Chamber
| Brand | Other Brands |
|---|---|
| Origin | Imported |
| Manufacturer Type | General Distributor |
| Model | OK-HAST-25 |
| Price | USD 14,000 (approx.) |
| Internal Dimensions (Ø × D) | 250 mm × 300 mm |
| External Dimensions (W × H × D) | 500 mm × 500 mm × 700 mm |
| Operating Temperature Range | 105 °C to 135 °C (143 °C optional) |
| Relative Humidity Range | 70–100 % RH |
| Pressure Range | 0.0–2.0 kg/cm² above ambient (3.0 kg/cm² optional) |
| Steam Generation | Saturated/unsaturated steam via electrically heated water reservoir |
| Circulation Method | Forced convection steam-air mixture |
| Power Supply | AC 220 V / 380 V, 50/60 Hz |
| Safety Systems | Dual overheat protection, mechanical safety interlock, pressure relief valve, low-water cutoff, auto-drain for non-saturated vapor purge |
Overview
The OK-HAST-25 High-Accelerated Stress Test (HAST) Chamber is an engineered environmental stress screening system designed for reliability qualification and failure mode acceleration in semiconductor packaging, LED modules, photovoltaic cells, magnetic components, printed circuit boards (PCBs), and other moisture-sensitive electronic assemblies. Unlike traditional temperature-humidity storage or damp heat tests (e.g., IEC 60068-2-78), the OK-HAST-25 operates under elevated temperature and pressure conditions—typically 105–135 °C and 0.0–2.0 kg/cm² above ambient—to induce moisture diffusion into encapsulants and die-attach interfaces at rates up to 10× faster than 85 °C/85 % RH testing. This enables rapid identification of latent defects such as wire bond corrosion, delamination, popcorning, and solder joint degradation—critical for AEC-Q200, JEDEC JESD22-A110, and MIL-STD-883H Method 1030.2 validation protocols.
Key Features
- Automated water replenishment system with level sensor feedback loop—maintains consistent steam generation throughout extended test cycles without operator intervention.
- Digital PID temperature controller with ±0.5 °C accuracy and real-time display; supports ramp-soak profiles and user-defined setpoint logging.
- Start-delayed digital timer activated only after chamber reaches target temperature—ensuring precise exposure duration compliance per test standard requirements.
- Calibrated dual-scale analog gauge displaying both absolute pressure (kg/cm²) and corresponding saturation temperature—enabling traceable correlation between pressure and effective humidity.
- Active steam quality management: integrated condensate purge cycle removes non-saturated vapor prior to test initiation, minimizing dew point variability and improving repeatability.
- Seamless silicone door gasket (food-grade EPDM alternative available) with compression-molded geometry ensures leak-tight sealing (>10⁵ cycles rated life) and uniform thermal boundary conditions.
- Electropolished stainless-steel interior chamber surface (Ra ≤ 0.8 µm) resists oxidation, facilitates cleaning, and prevents particulate shedding during high-humidity operation.
- Interlocked door mechanism: power supply to heating elements and steam generator is physically disabled unless latch torque exceeds 15 N·m—verified by mechanical switch and redundant microswitch monitoring.
- ASME-certified spring-loaded safety relief valve (set at 2.2 kg/cm² for standard configuration) with manual override and visual status indicator.
- Dual independent overtemperature protection: primary solid-state controller + secondary bimetallic cutout (150 °C trip), triggering audible alarm and full power isolation within <2 s.
- Thermoplastic ABS outer door shield—meets UL 94 V-0 flammability rating and limits surface temperature to <55 °C during operation per EN 61000-3-2.
Sample Compatibility & Compliance
The OK-HAST-25 accommodates standard JEDEC trays (MO-178, MO-220), 8-inch wafer carriers, and custom fixtures mounted on two included 304 stainless steel shelves (load capacity: 15 kg/shelf, uniformly distributed). Chamber volume (14.7 L net) supports IPC-J-STD-020D-compliant reflow simulation for MSL 3–6 components. All electrical and pressure systems comply with CE marking directives (2014/30/EU EMC, 2014/68/EU PED), and thermal insulation meets ISO 13788 vapor diffusion resistance requirements. Optional calibration certificates (NIST-traceable Pt100 sensors, pressure transducer) are available for GLP/GMP-regulated labs requiring audit-ready documentation per FDA 21 CFR Part 11 Annex 11.
Software & Data Management
While the base unit operates via front-panel controls, optional RS-485 Modbus RTU interface enables integration with LabVIEW™, MATLAB®, or enterprise MES platforms (e.g., Siemens Opcenter, Rockwell FactoryTalk). Logged parameters—including chamber temperature, jacket temperature, pressure, elapsed time, and alarm events—are timestamped at 1-second intervals and exportable as CSV or XML. Audit trail functionality records all parameter changes, user logins, and system resets with SHA-256 hashing—supporting ALCOA+ data integrity principles. Firmware updates are performed via secure USB key with digital signature verification.
Applications
- Qualification of conformal coatings and underfill materials per IPC-CC-830B accelerated aging.
- Failure analysis root cause isolation for field-return units exhibiting moisture-induced parametric shift.
- Process validation of wafer-level packaging (WLP) and fan-out wafer-level packaging (FOWLP) structures.
- Reliability benchmarking of GaN-on-Si power devices subjected to high-voltage bias during HAST exposure.
- Material compatibility screening of adhesives, laminates, and flex-circuit substrates under combined thermal-mechanical-humidity stress.
FAQ
What standards does the OK-HAST-25 support?
It is configured to execute JEDEC JESD22-A110 (HAST), JESD22-A118 (uHAST), IEC 60749-26, and MIL-STD-883H Method 1030.2 out-of-the-box. Custom profiles can be loaded for internal qualification protocols.
Is the chamber suitable for testing hermetically sealed packages?
Yes—its pressure control stability (±0.02 kg/cm²) and rapid pressure ramp rates (0.5 kg/cm²/min typical) enable reliable assessment of seal integrity via helium leak rate correlation per ASTM F2391.
Can the OK-HAST-25 operate continuously for 96+ hours?
With proper maintenance (weekly drain-and-refill, quarterly gasket inspection), it supports unattended operation up to 168 hours per cycle—validated per ISO 16750-4 Annex C long-duration test requirements.
Does it include data export capability for regulatory submissions?
Standard USB port supports raw data dump; optional Ethernet module adds TLS 1.2-secured remote access and e-signature-enabled report generation compliant with 21 CFR Part 11 Subpart B.
What maintenance intervals are recommended?
Water reservoir descaling every 30 days (citric acid flush), pressure gauge calibration annually, and door gasket replacement every 24 months or after 5,000 cycles—whichever occurs first.
