The normal lifespan of magnesium oxide insulation in hot runner systems is typically over 20,000 hours. Under proper use and maintenance, it can operate stably for 2-3 years. The specific lifespan is significantly affected by material purity, processing methods, and the operating environment.
Key Factors Affecting Lifespan
Materials and Process Quality
High-purity magnesium oxide (≥99.9%) has stronger anti-aging properties; Insulation materials coated with silica or replaced with aluminum nitride can significantly improve moisture resistance and thermal conductivity.
Ambient Temperature and Humidity
Prolonged exposure to high humidity environments (>80% RH) accelerates moisture absorption and degradation; Frequent temperature cycling can easily cause microcracks, leading to moisture intrusion.
Sealing Structure Reliability
Poor sealing at the outlet is the main cause of moisture infiltration, directly shortening the insulation lifespan; Correct installation and regular inspection of the sealing rings are crucial.
Electrical Load and Control Accuracy
Overload operation leads to localized overheating, accelerating the degradation of magnesium oxide powder performance.
Precise temperature control reduces thermal stress shock and extends overall lifespan.
Practice shows that in highly corrosive environments such as chemical plants, high-quality insulation systems can maintain stable performance, with lifespans generally exceeding 15,000 hours.
Recommended Measures to Extend Lifespan
Measure Description
Pre-drying before installation: Heaters stored for extended periods should be baked at 150–200℃ for 1–2 hours before use to restore insulation performance.
Avoid contamination contact: Wear gloves during operation to prevent sweat and oil from contaminating the magnesium oxide area at the output terminals.
Regular insulation resistance testing: It is recommended to measure insulation resistance quarterly. ≥100 MΩ is normal; below 10 MΩ requires immediate replacement.
Optimizing cooling and ventilation: Reduce ambient temperature fluctuations and decrease the risk of condensation.
If a continuous decrease in insulation resistance or leakage is detected, even if the system is not completely faulty, replacement should be planned to avoid sudden downtime.
