This article summarizes the 5 main causes of injection mold water leakage<\/strong> and provides practical, professional solutions for on-site maintenance and repair, helping you quickly diagnose and solve cooling system problems.<\/p>\n The most common location for water leakage is the cooling water pipe joints<\/strong>.<\/p>\n After long‑term production, O‑ring rubber seals<\/a>2<\/a><\/sup><\/strong> tend to harden, crack, or deform, resulting in seal failure.<\/p>\n This issue often appears in new molds<\/strong>. Even with adequate designed wall thickness, machining errors or secondary processing<\/strong> can penetrate the cooling channel wall.<\/p>\n Cooling channels easily accumulate scale and rust<\/strong>, which block water flow and reduce heat transfer.<\/p>\n Leakage Test After Maintenance<\/strong>:\nUse a hand pressure pump to pressurize the cooling circuit to 2 MPa and hold for 5 minutes<\/strong>. If pressure remains stable, the system is sealed properly.\nLeak points can be sealed using elastic materials such as rubber or cork via mechanical compression. Room‑temperature curing silicone is also a reliable option.<\/p>\n Heating channels provide effective heat transfer, especially for cooling slender, deep cores.\nInstalling unidirectional heating channels in high‑flow areas helps reduce leakage risks.\nIn addition, using a vacuum pump<\/strong> to draw cooling water can further prevent unintended leakage.<\/p>\n Mold cooling system leakage is mostly preventable with regular inspection and proper maintenance<\/a>3<\/a><\/sup><\/strong>. By focusing on pipe joints, O‑ring seals, cooling channel integrity, descaling, and pressure testing, you can greatly reduce downtime and maintain stable production.<\/p>\n Timely maintenance not only fixes existing leaks but also extends mold life, improves cooling efficiency, and ensures consistent part quality.<\/p>\n Explore this resource to discover effective strategies that enhance efficiency and quality in injection molding production.\r \u21a9<\/a><\/p><\/li> Learn how to properly maintain O-ring rubber seals to prevent leaks and ensure the longevity of your molds.\r \u21a9<\/a><\/p><\/li>![\"comment](\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/02\/how-to-fix-leaking-injection-molds.jpg\")
<\/p>\nLeakage at Cooling Water Pipe Joints<\/h2>\n
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Worn or Damaged O‑Ring Seals<\/h2>\n
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Damaged Cooling Channel Walls<\/h2>\n
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Cooling Channel Maintenance and Descaling<\/h2>\n
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Maintenance of Heating Channels and Vacuum Pump Systems<\/h2>\n
\nConclusion<\/h2>\n