High-temperature engineering plastics used in hot runner systems possess core advantages such as high temperature resistance, dimensional stability, high strength, chemical corrosion resistance, and low moisture absorption, effectively ensuring the stability of the injection molding process and product quality.
1. Excellent High-Temperature Resistance
Can operate continuously above 150℃, some materials (such as PEEK, LCP) can withstand short-term temperatures above 300℃
Ensuring no thermal degradation or softening deformation under continuous heating in hot runner environments
Suitable for precision injection molding in demanding industries such as automotive and electronics
2. Good Dimensional Stability
Low molding shrinkage (e.g., LCP only 0.1%～0.2%, PEI 0.5%～0.7%)
Maintains precise fit even under temperature fluctuations, reducing leakage or jamming caused by thermal expansion and contraction
Especially suitable for miniaturized, multi-cavity mold designs
3. High Mechanical Strength and Creep Resistance
Maintains structural integrity even under high-temperature loads
For example, PAI has a tensile strength of up to 190MPa and a HDT (heat distortion temperature) as high as 274℃
Suitable for load-bearing components such as nozzles and manifold supports
4. Strong Chemical Corrosion Resistance: Excellent resistance to common mold release agents, cleaning agents, and oil stains encountered during injection molding.
Materials such as PPS and LCP are virtually unaffected by most solvents, extending mold life and reducing maintenance frequency.
5. Low Moisture Absorption and Hydrolysis Resistance: Most high-temperature engineering plastics (such as PPS, PEI, and PSU) have a water absorption rate of less than 0.3%, making them less prone to cracking or insulation failure due to moisture absorption in the high-humidity environment of Wuhan summers (humidity exceeding 80%), reducing drying energy consumption and improving production efficiency.
6. Excellent Electrical Insulation: Meets the electrical safety requirements of hot runner temperature control systems.
Materials such as PEI and PES possess UL94 V-0 flame retardant rating and stable dielectric properties, making them suitable for critical components such as sensor housings and terminals.
