SOURCING TASK GUIDE · SUPPLIER SEARCH
Compare plastic part tooling and unit prices
Plastic parts involve trade-offs between tooling investment and unit price. Comparing steel proposals, cavity layouts, volumes and commercial terms identifies questions to resolve before choosing a tooling route.
Zhipact collects and analyzes tooling and unit price proposals from specialized Chinese injection molding factories, comparing mold steel specifications, cavity configurations, production lead times, and unit price curves.
What you share for this task
- 3D CAD part models (STEP/IGES) with draft angles, wall thickness, and parting line preferences.
- Material specifications including resin grade (e.g., ABS, PC, POM, PP) and color masterbatch codes.
- Surface finish expectations (e.g., SPI polish standards, VDI spark texture, or custom EDM grain).
- Target production volume forecasts across initial trial runs and annual volume projections.
What we coordinate and deliver
- A tooling-plus-part-cost comparison with stated inclusions.
- Supplier DFM feedback and any separate engineering review needed.
- Quoted steel and shot-life conditions, separating claims from verified evidence.
- Sample, payment and ownership terms requiring approval.
PRACTICAL RISK POINTS
Three critical issues to resolve before choosing a supplier
Key commercial and capability factors to clarify before placing an order.
1. Quoting soft steel molds for high-volume abrasive engineering resins
The situation: A steel grade or hardness is quoted without explaining its suitability for the resin, finish, expected output and maintenance conditions, making apparently similar tooling prices hard to compare.
How we check it in China: We record supplier-stated steel, hardness, treatment, output and warranty conditions. Engineering suitability or material verification requires an agreed provider and method.
The record & next decision: A tooling steel comparison matrix records steel grades, warranty shot counts, and maintenance provisions before mold deposits are paid.
2. Selecting single-cavity prototype molds that penalize production unit economics
The situation: Selecting single-cavity prototype tooling that saves upfront capital but results in uncompetitive unit costs for scaling production.
How we check it in China: We compare 1-cavity, 2-cavity, and 4-cavity tooling quotes, calculating unit cost savings against mold investment across forecast volumes.
The record & next decision: A tooling-plus-part-cost schedule compares the quoted investment and unit prices across forecast quantities, with assumptions and excluded costs visible. It is not a complete landed-cost estimate.
3. Ambiguous mold ownership and transfer rights in supplier agreements
The situation: Suppliers retaining mold custody without clear written agreements regarding mold ownership transfer, maintenance obligations, or modification costs.
How we check it in China: We clarify mold ownership terms, storage conditions, trial sample approval milestones (T0/T1), and mold transfer conditions in the supplier quotation.
The record & next decision: A commercial terms checklist records proposed ownership, custody, sample sign-off, maintenance and transfer conditions, alongside questions to resolve in the project agreement before payment.
| Tooling Proposal | Mold Steel Spec | Cavity Layout | Tooling Cost | Unit Part Price | Amortized Cost @ 10k |
|---|---|---|---|---|---|
| Option A: Rapid Prototype Tooling | 718H Pre-Hardened (30-34 HRC) | 1-Cavity (Cold runner) | $2,200 | $0.85 / pc | $1.07 / pc |
| Option B: Bridge Production Tooling | P20 Tool Steel (32-36 HRC) | 2-Cavity (Cold runner) | $3,800 | $0.52 / pc | $0.90 / pc |
| Option C: High-Volume Production Tooling | S136 Hardened Steel (48-52 HRC) | 4-Cavity (Hot runner tip) | $6,500 | $0.32 / pc | $0.97 / pc |
| Option D: Scaled Multi-Cavity Tooling | NAK80 Mirror Polish Steel | 8-Cavity (Full hot runner) | $11,500 | $0.19 / pc | $1.34 / pc |
Clear execution roles and agreed boundaries
Eddie leads requirements review, quotation comparison and supplier decisions. Coordination colleagues request clarifications and record sources, assumptions and unanswered points. Site visits, engineering reviews or specialist checks are arranged separately where the task requires them.
Transparent fee structure: Sourcing coordination is quoted as an agreed service fee. Physical handling, kitting or checks follow agreed task rates via partner facilities. Reimbursable third-party expenses require written approval.
COMMON QUESTIONS
Frequently asked about this task
What is the typical payment schedule for custom injection mold tooling?
Tooling contracts stage payments across project milestones (e.g., deposit upon contract signing, intermediate milestone upon T1 sample approval, and final balance after pre-production sign-off).
What happens if T1 trial injection molded samples fail to meet drawing specifications?
We record differences and request correction costs and timing. Responsibility, retesting and payment release follow the actual agreement, distinguishing design changes from supplier errors. Further work requires the agreed approval.
Ready to scope your supplier search task?
Share your target specifications, target BOM, or quotation drafts. We clarify feasibility, deliverables, and fees before paid work starts.