Hot runner systems deliver molten polymer through heated manifolds and nozzles directly to each cavity of an injection moulding tool. Suitable for PP, ABS, PC, PA and filled materials, they improve cycle time and quality in automotive, packaging, medical, and electronic injection‑moulded parts.
Hot runner systems are temperature‑controlled melt delivery systems used in injection moulding to convey molten polymer from the machine nozzle to individual cavity gates without solidifying. They consist of heated manifolds, nozzles, valve pins, heaters, and sensors that maintain consistent melt temperature and flow. Materials processed include PP, PE, ABS, PC, PA, POM, PET, and glass‑ or mineral‑reinforced compounds. Tooling design focuses on thermal balance, leak‑free sealing surfaces, precise gate control, and wear‑resistant components, especially for abrasive or high‑temperature polymers. Valve‑gated systems provide accurate filling, reduced stringing, and improved surface appearance, while open nozzles offer simplicity and high‑speed capability. Hot runners reduce material waste by eliminating cold runners, improving cycle times, and enhancing part quality. They are widely used in high‑volume applications such as packaging closures, automotive interior and exterior components, medical devices, consumer electronics housings, and multicavity moulds where consistent gating and high productivity are essential.
BÖHLER M200 is a prehardened, non-corrosion-resistant chromium-manganese-molybdenum alloyed plastic mould steel with very good machinability and uniform strength over the entire cross-section of medium-sized dimensions.
Read MoreBÖHLER M303 is a corrosion-resistant, martensitic chromium steel with very good toughness, corrosion resistance, good wear resistance and improved machinability and polishability. Compared to 1.2316, BÖHLER M303 has better homogeneity and is approved for food and beverage contact.
Read MoreBÖHLER M310 ISOPLAST is a corrosion-resistant, martensitic chromium steel which, through electroslag remelting and optimization of the chemical composition, has a good homogeneity and a balanced hardness-toughness-corrosion resistance ratio.
Read MoreBÖHLER M315 is a prehardened, corrosion-resistant martensitic plastic mold steel. Due to its chemical composition, BÖHLER M315 has improved machinability compared to 1.2085 and is approved for food contact.
Read MoreBÖHLER W302 ISOBLOC is a 5% chromium steel and corresponds to material number 1.2344 (X40CrMoV5-1). Produced via the electroslag remelting process (ESR), this tool steel has very high hot toughness as well as very high hot hardness and a very good resistance against heat-checkings. The combination of these properties makes it a top performer in closed- and open-die forging as well as in high- and low-pressure die casting. In addition, this material has very good polishability and is therefore also often used as a molding material for plastic injection molds.
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