The duration of service under typical operating conditions
A standard 304 stainless steel armoured sheath provides a continuous, stable service life of 12–18 months under standard hot runner production conditions (200–400°C)-as long as the installation bending radius strictly satisfies the requirement of ≥5 times the sheath's outer diameter and there is no exposure to extreme temperatures or highly corrosive environments-without problems like insulation degradation or armour layer cracking.
Service Life in Extreme Operating Conditions
The oxidation rate of the sheath's metal layer accelerates in hard working situations, which are defined by extended exposure to temperatures exceeding 600°C, strong vibration, or corrosive atmospheres. This shortens the service life to 6–9 months and requires proactive replacement.
Maximum Service Life with Appropriate Upkeep
The service life of some high-quality 316L stainless steel armoured sheaths can reach 24 months if the installation closely follows the national standard for long-term operation bending radii (≥20 times the sheath's outer diameter), insulation performance is routinely checked, and operation above rated temperatures is avoided. This greatly reduces maintenance and replacement costs for hot runner systems.
This service life performance guarantees long-term operating stability while preserving installation flexibility, completely satisfying the requirements of precision hot runner injection moulding.
