240 hours. No cracking.

Test Process Sequence

Inspect, clean and degrease copper-based alloy parts as required. Prepare aqueous ammonia with specific gravity 0.94 and dose ≥20 mL/L chamber volume. Place specimen on inert tray 35 ± 5 mm above ammonia solution. Close lid with screw-lock clamps. Maintain chamber at 35 ± 5°C for 240 hours/10 days with continuous temperature and NH3 monitoring. Vent ammonia vapours through scrubber/neutralisation before opening. Inspect specimen for cracking/delamination. Generate traceable report with temperature profile and exposure time.

Safety and Engineering Notes

• Ammonia is hazardous; final design includes ventilation, exhaust treatment, chemical handling procedure and PPE requirements
• This machine is NOT a high-pressure burst or hydrostatic test machine; it is an atmospheric chemical exposure chamber
• Exact applicability determined based on component material, customer DAP, UN ECE R134/AIS-157 clause requirement and approved QAP
• Final chamber dimensions, volume, ammonia quantity and exhaust capacity finalised during detailed design review
• All wetted and vapour-exposed parts must be compatible with ammonia atmosphere
• Specimen tray must not react with the test medium

FAT/SAT Verification

Dimensional check of chamber size, lid operation and tray height adjustment per approved drawing. Temperature stability demonstration within 35 ± 5°C. Timer/data logging demonstration with report generation. E-stop, lid interlock and exhaust permissive interlock test. Controlled venting demonstration before opening. Dry run process simulation without hazardous sample.