Fin Heating Tube Helium Leak Test & Tube Seal Hermeticity Verification

Fin heating tube helium leak test detects micro-leaks at end seal crimping, tube weld and sheath pinholes that standard hi-pot test cannot identify. Fin heating tube helium test principle: evacuate element and probe outer surface with helium mass spectrometer to detect tracer gas infiltration. Fin heating tube helium leak acceptance threshold: leak rate ≤1×10⁻⁸ mbar·L/s for cold storage defrost heater. Fin heating tube micro-leak allows moisture ingress over long time; gradually reduces insulation resistance and causes premature failure. Chuanli Cold Storage Electric Defrosting Tubes applies helium leak test on high-reliability and food-grade project batches. Fin heating tube helium leak test is performed after crimping, curing and thermal cycling of end seal assembly. Fin heating tube alternative for mass production: bubble immersion test for screening gross leaks, helium reserved for critical sampling. Fin heating tube seal failure root cause: improper crimp pressure, filler contamination, thermal cycling crack and seal compound curing defect. Fin heating tube failed helium unit must be rejected; repair and retest is not permitted for safety critical heating elements. Fin heating tube helium leak test verifies hermetic sealing integrity to block moisture ingress into MgO insulation.

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FAQs Q: What is helium leak acceptance leak rate? A: ≤1×10⁻⁸ mbar·L/s. Q: What defect helium test finds that hi-pot cannot? A: Micro-leaks at seal, weld and sheath pinholes. Q: What is the hazard of micro-leak? A: Slow moisture ingress, gradual insulation degradation. Q: When is helium leak test performed? A: After crimping, seal curing and thermal cycling. Q: What low-cost mass screening method for large leaks? A: Bubble immersion test. Q: Can failed helium tested element be repaired? A: No, reject directly. Q: What is the core purpose of helium leak test? A: Verify hermetic seal to prevent moisture entering MgO.