What is the difference between hot runner and cold runner mould systems?

Cold runner moulds solidify the runner system with every cycle, requiring regrinding or disposal. Hot runner moulds keep the runner molten inside heated manifolds and nozzle tips, delivering zero runner waste, faster cycle times, and lower injection pressures.

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Common mould steel selections include: P20 (pre-hardened, good for up to 300,000 shots of non-corrosive polymers), H13 (hardened to 48-52 HRC for 1,000,000+ shots and abrasive glass-filled resins), and S136 / Stavax (stainless ESR steel for corrosive PVC and high-polish optical lenses).

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