Plastic Injection Molding Services
Dongguan, China
Custom injection molding for engineers, OEMs, and product teams who need real mold ownership, not subscription tooling. Aluminum prototypes in 5 days, P20 bridge molds in 2 weeks, hardened H13/S136 production tools rated for 1,000,000+ cycles. 100+ thermoplastics, overmolding, insert molding. ISO 9001 + 14001 certified.
5 days
Prototype mold
1M+
Production cycles
100+
Thermoplastics
±0.02 mm
Tight tolerance
Injection molding without the vendor lock-in
Plastic injection molding is the dominant manufacturing process for plastic parts at any volume above ~500 units. You design a part, we cut a steel mold (the “tool”), then plastic granules melted to 200-300°C are injection-shot into the cavity at high pressure, cooled, and ejected — repeating every 15-60 seconds for the life of the mold.
The mold cost (one-time, $1.5K-$30K) is the big variable. Per-part cost is usually $0.10-$3.00 depending on size, material, and shot complexity. That’s why injection molding wins above ~500 units but loses to CNC for one-off prototypes — the mold amortizes across thousands of parts.
What sets Ginwate’s injection molding services apart from other Dongguan shops: mold ownership transfers to you on final payment. You own the mold drawings, the cavity layout, the gate scheme. You can move production to another vendor any time. No subscription tooling, no “we own the tool” pricing tricks. We make money on quality production, not on locking customers in.
Three mold tiers — pick the right one for your volume
The mold steel determines lifetime and cost. Match the tier to your expected production volume to avoid overpaying for capacity you won’t use.
Prototype Mold
10–10,000 parts
5–10 days
$1,500–$4,000
Aluminum 7075 or soft P20
Design validation, market testing, low-volume production
Bridge / Low-Volume Mold
10,000–50,000 parts
10–15 days
$3,000–$8,000
Pre-hardened P20 (28-32 HRC)
Pre-production runs, bridging while you wait for production mold
Production Mold
100,000–1,000,000+ parts
20–35 days
$6,000–$30,000+
Hardened H13 / S136 / 718H (48-52 HRC)
Full production volume, parts requiring tight tolerance over millions of cycles
Equipment + capabilities
Mold design + DFM review
Senior tool engineer reviews every part for moldability — gate location, draft angles, wall thickness, parting line, ejection. DFM report with every quote, free of charge.
Mold manufacturing in-house
Aluminum 7075 (prototype), P20 (low-volume), H13 / S136 / 718H (production). CNC milling, EDM, wire EDM, polishing all done under one roof. No mold subcontracting.
100+ thermoplastics
ABS, PC, PC+ABS, PA6/PA66, POM, PEEK, TPU, TPE, PP, PE, PS, ASA, PMMA, PSU, PPS, PEI. Glass-filled, carbon-filled, FDA-grade, flame-retardant variants stocked or sourced.
Overmolding + insert molding
Soft-touch grips on rigid handles. Metal inserts molded directly into plastic. Multi-shot 2K molds. Cleanly bonded interfaces without secondary assembly.
Tight tolerance + cosmetic finishes
±0.05 mm standard, ±0.02 mm on critical features. Texture finishes per MoldTech / VDI standards. Polished mirror cavities for transparent parts (PC, PMMA, ABS).
ISO 9001 + traceability
Material certs, FAI on first article, lot tracking. ISO 13485-aligned process available for medical device parts.
Quote to production, step by step
Quote + DFM review (1–4 hours)
Upload STEP file. Senior tool engineer reviews moldability, suggests gate location + draft angles, returns detailed quote with mold cost, per-part price, and lead time. DFM feedback free even if you don’t proceed.
Mold design + approval (3–5 days)
2D mold layout drawing + 3D cavity/core CAD shared for your sign-off. We list mold class (prototype / bridge / production), steel grade, cooling design, ejection scheme, gate type. Nothing cut until you approve.
Mold manufacturing (10–35 days)
Mold base sourced, cavity/core CNC milled, EDM details cut, polished to spec, assembled and water-tested. Progress photos shared every 3 days. T0 first-shot review video before you approve to ship.
T0/T1 sampling + adjustments
First 50 parts sampled and inspected dimensionally. Free mold tuning to hit drawing — most parts dial in within T1 or T2. We don’t release for production until parts pass FAI.
Production + ship
Production runs scheduled per your forecast. JIT shipments via DHL / FedEx / UPS or sea freight for large volumes. Quality records + COC + material certs with every shipment.
Why product teams pick Ginwate for tooling
5-day prototype molds
Aluminum prototype molds in as fast as 5 working days. Fastest way to validate design without committing to a production tool.
±0.02 mm critical tolerance
Standard ±0.05 mm. Critical dimensions held to ±0.02 mm. Hexagon CMM verification + FAI report on first article.
Mold-from-1-part
No MOQ on prototype molds. We tool a single proof-of-concept part if that’s all you need.
Mold ownership transfers
You own the mold outright after final payment. We store it free for 2 years + ship to your warehouse on request. No vendor lock-in.
DDP shipments worldwide
Daily air freight pickup. Sea freight FOB Yantian / Shenzhen for large runs. Most production orders door-to-door in 5-10 days globally.
30+ surface finishes
Mold polish A1-D3, MoldTech texture MT-11000 series, VDI 3400 finishes Ch1-Ch45, EDM finish. Custom textures from supplied photo or sample.
Injection molding FAQ
How much does plastic injection molding cost?
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Mold cost: $1,500-$4,000 for aluminum prototype molds, $3,000-$8,000 for pre-hardened P20 bridge molds, $6,000-$30,000+ for hardened H13/S136 production molds. Per-part cost typically $0.10-$3.00 depending on size, material, complexity, and quantity. The mold is a one-time investment; per-part cost drops sharply with volume.
How fast can you deliver an injection molded prototype?
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Aluminum prototype mold + 50 sample parts in 5-10 working days. Bridge mold (pre-hardened P20) + 100 sample parts in 10-15 days. Production mold (hardened) ready for full runs in 20-35 days. We send progress photos every 3 days during mold cutting.
What plastics can you injection mold?
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100+ thermoplastics including ABS, PC, PC+ABS, PA6, PA66, POM, PEEK, TPU, TPE, PP, PE, PS, ASA, PMMA, PSU, PPS, PEI. Glass-filled (GF15/30/40), carbon-filled, mineral-filled, flame-retardant (UL94 V0), FDA-compliant, and antistatic variants available. Tell us your material spec sheet and we’ll source it.
Do you offer overmolding and insert molding?
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Yes. Overmolding: soft-touch TPE/TPU over rigid ABS/PC for handles, grips, seals. Insert molding: brass threaded inserts, stamped metal contacts, screws molded directly into the plastic at the cavity. Both done in a single shot — no secondary assembly. We also do 2K (two-shot) molding on co-injection presses for hardware running >10K units.
What's the difference between prototype, bridge, and production molds?
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Prototype molds (aluminum 7075 or soft P20) are cheapest and fastest but rated for ~10K shots — perfect for design validation. Bridge / pre-hardened molds (P20 28-32 HRC) run 50K-100K shots and let you bridge to market while production tooling is being made. Production molds (hardened H13/S136/718H at 48-52 HRC) run 500K-2M+ shots and are the long-term tool. Most products do prototype → production; bridge molds are skipped unless time-to-market is critical.
Do I own the mold after I pay for it?
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Yes. Mold ownership transfers to you on final payment. We store the mold free for 2 years (most clients leave it with us for production runs) and ship it to your facility or another molder on request. Full mold drawings, cavity layouts, and gate locations included with every project — no proprietary lock-in.
What tolerance can you hold on injection molded parts?
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Standard tolerance: ±0.05 mm on most dimensions per DIN 16742 medium class. Critical features (mating bores, snap-fit catches, bearing seats) tightened to ±0.02 mm. Tighter is possible but increases mold cost (more EDM time, ground steel) and may require secondary machining. We assess feasibility per feature in the DFM review.
Can I get FDA-grade or medical-grade injection molding?
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Yes. FDA-grade resins (PEEK, PP medical grade, PC LX, USP Class VI silicones) stocked or sourced. ISO 13485-aligned process available for medical device parts including DHF documentation, material traceability, and IQ/OQ/PQ records. Cleanroom molding (Class 100K) available on request for medical and electronics applications.
What surface finishes are available on molded parts?
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Mold polish: A1 (mirror) through D3 (rough sandblast) per SPI standards. Texture: MoldTech MT-11000 series, VDI 3400 Ch1-Ch45, photo-etched textures, leather-grain, woodgrain. Custom textures from your supplied sample. Post-molding: pad printing, silk screen printing, laser engraving, EMI shielding paint, primer + paint.
How fast can you scale from prototype to mass production?
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Typical timeline: Week 1 — DFM review + quote. Week 2-3 — mold design + cutting. Week 4-5 — T0 sampling and tuning. Week 6 — production-ready. For projects on tight time-to-market, we run prototype mold + production mold in parallel: prototype parts ship while production mold is being cut. Bridge molds (P20) eliminate the 4-6 week gap between prototype and production runs.
Do you handle low-volume injection molding (under 1000 parts)?
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Yes — this is our prototype mold tier. Aluminum 7075 molds run 5K-10K shots reliably and cost 30-60% less than steel production molds. Ideal for product validation, market testing, design freeze, or one-off custom runs. Per-part cost is higher than steel-mold production runs (no economies of scale), but the total project cost is lower because you don’t pay for unused mold capacity.
What documentation comes with injection molded parts?
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First Article Inspection (FAI) with dimensional inspection report. Material Certificate with grade, lot number, and supplier. Certificate of Conformity. Process record showing barrel temp, injection pressure, cycle time, and inspection cadence. RoHS/REACH declarations on request. Mold maintenance log (for our long-term production clients).
Ready to start your mold?
Upload your STEP file. Senior tool engineer reviews moldability + emails detailed quote within 4 hours. Free DFM report. No sales call needed.