Injection mould for plastic

For high-volume production, you must prioritize mould steel grade and cavity number. Ensure the supplier uses high-quality steel like P20, 718, or S136 for the core and cavity to guarantee a mould life of 300,000 to 1,000,000 shots. Additionally, verify the cooling system design, as efficient cooling channels significantly reduce cycle time and prevent part warping.

You must provide the supplier with your machine's technical data sheet, specifically the tie-bar spacing, maximum opening stroke, and minimum/maximum mould thickness. Ensure the locating ring diameter and ejector rod hole pattern align with your machine standards (e.g., EUROMAP or SPI standards) to avoid costly modifications upon delivery.

Request a Weekly Progress Report with photos and videos of the machining stages (CNC, EDM, Wire-cutting). It is essential to demand a T1 Sample Inspection Report and a Mould Trial Video. The supplier should provide a Dimensional Inspection Report (FAI) to confirm the plastic parts produced meet your specified tolerances, typically ±0.05mm to ±0.1mm for standard industrial parts.

Hot Runner systems (like Yudo or Mold-Master) have a higher initial cost but offer zero waste (no runners) and faster cycles, making them ideal for mass production. Cold Runner systems are more economical for low-volume orders but result in higher material waste and longer cycle times. Choose based on your Total Cost of Ownership (TCO) and projected production volume.

Before sharing 3D designs or CAD files, sign a Non-Disclosure Agreement (NDA) that is enforceable in the supplier's jurisdiction. Ensure the contract explicitly states that the ownership of the mould and all design files belongs solely to the buyer. For high-security projects, consider sourcing from Audited Suppliers on Made-in-China.com who have verified business licenses and physical factory locations.

The primary risk is oxidation (rust) during sea freight. Require the supplier to apply anti-rust oil to all polished surfaces and wrap the mould in vacuum-sealed plastic before placing it in a fumigated wooden box. Ensure the package includes a spare parts kit (O-rings, springs, ejector pins) to prevent downtime if small components break during initial setup.

Adopt a milestone-based payment schedule: typically 40% deposit, 30% after T1 sample approval, and the final 30% after the mould trial video is confirmed and before shipment. Use secure payment methods and consider third-party inspection services to verify the mould's condition before the final balance is paid.

Check the HS Code (typically 848071) for import duties in your country. Be aware of Anti-Dumping duties or specific trade barriers that may apply to steel products from certain regions. Ensure the supplier provides a Certificate of Origin to help you benefit from any applicable Free Trade Agreements (FTAs).