Injection Mold Procurement Guide

Custom Injection Mold RFQ Checklist for OEM Plastic Parts

A custom injection mold RFQ should define part function, resin, annual volume, tolerance, surface finish, tooling life, mold steel, cavity number, gating, cooling, sample approval and production schedule. Clear technical information helps OEM buyers compare mold suppliers by engineering capability, not only tooling price.

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1. Confirm Part Function, Material And Production Volume

Before quotation, the mold supplier needs to understand how the plastic part will be used. Outdoor products, medical housings, electrical shells, gears, wheels and flame-retardant housings may require different resin, shrinkage control, surface finish, strength, assembly tolerance and tooling structure.

The RFQ should include the 3D model, 2D tolerance drawing, material grade, color, texture, expected annual volume, target part weight and whether the supplier also needs to provide injection molding production after mold approval.

Custom injection mold quotation should connect tooling design, plastic part function and production volume.

2. Prepare DFM, Mold Structure And Sampling Requirements

A professional injection mold RFQ should ask how the supplier reviews parting line, draft angle, wall thickness, ribs, bosses, undercuts, ejector marks, gate position, cooling layout and potential sink marks or warpage. DFM feedback before tooling helps reduce later modification cost.

• Tooling scope: mold base, cavity number, mold steel, hot runner or cold runner, slider/lifter and ejection system.
• Part requirement: tolerance, appearance surface, texture, color, assembly fit and functional test.
• Sampling plan: T0/T1 sample timing, inspection report, material certificate and modification process.
• Production plan: cycle time target, annual quantity, packing method and delivery schedule.

3. Check Core, Cavity, Cooling And Quality Control

Mold quality depends on engineering details. Buyers should ask how the supplier manages core and cavity design, parting line, cooling balance, venting, runner design, steel hardness, electrode process, polishing and mold trial records.

For OEM plastic parts, the RFQ should also clarify inspection dimensions, critical-to-quality features, sample quantity and whether CMM or other inspection documents are needed before mold shipment or mass production.

Core, cavity and parting line review are important for precision injection mold design and stable plastic part production.

4. Compare Suppliers By Engineering Response And Production Support

A low mold price may not include DFM review, mold flow discussion, trial reports, texture control, engineering changes or production support. OEM buyers should compare suppliers by communication quality, tooling experience, machining process, quality control and ability to support future molding production.

For long-term projects, it is useful to request separate pricing for tooling, samples, production parts, spare inserts and mold maintenance so the buyer can evaluate total project cost.

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FAQ For Custom Injection Mold RFQ

What files are needed for a custom injection mold quote?

Send 3D files, 2D drawings, material grade, surface finish, tolerance, annual quantity and sample schedule.

Why is DFM review important before tooling?

DFM review helps identify parting line, draft angle, wall thickness, gate position, sink mark, warpage and assembly risks before mold manufacturing.

How should OEM buyers compare mold suppliers?

Compare suppliers by engineering response, machining capability, quality control, sampling process, modification support and long-term production service.