Plastic Injection Molding Service from a Trusted China Manufacturer

Custom injection molded parts from prototype to production. Factory-direct pricing, free DFM analysis, 100+ materials, and T1 samples in as fast as 10 days. Upload your CAD file and get a quote within 24 hours.

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ISO 9001 Certified Factory Quote in 24 Hours NDA Protected Free DFM Feedback
Injection Molding at YiguProto China factory
Your injection molded parts are made, inspected, and shipped from our own factory in Dongguan, China

The Problem We Solve

Tired of suppliers who over-promise and under-deliver?

We know the pain points buyers face when sourcing plastic parts from China.

Missed deadlines. Surprise price hikes. Parts that arrive warped, short-shot, or out of spec. Communication gaps that leave you in the dark for weeks. These issues cost you money, slow your launch, and damage your reputation.

With YiguProto as your China injection molding manufacturer and supplier, you get one accountable partner from quote to delivery. No middlemen. No surprises. Just quality parts, on time, at factory-direct prices.

  • Factory-direct pricing — we own the tool shop and molding floor, so you cut out the trading company markup
  • Free DFM on every quote — our engineers catch design issues before steel is cut, saving you time and money
  • One point of contact — a dedicated project engineer who speaks your language and responds within hours
  • Transparent quality control — inspection reports and T1 sample photos sent before shipment
  • You own the mold — no lock-in, no hidden mold-ownership fees
Upload Your File & Get a Quote Ask an Engineer

Overview

What Is Plastic Injection Molding?

In simple terms: we melt plastic pellets, inject the molten plastic into a metal mold under high pressure, let it cool and harden, then eject a finished part. Repeat thousands or millions of times, and every part comes out nearly identical.

It is the most cost-effective way to make consistent plastic parts at scale. A single mold can produce tens of thousands to millions of parts before it needs maintenance. The per-part cost drops dramatically as volume goes up, which is why injection molding is used for everything from medical devices to consumer electronics housings.

At YiguProto, our injection molding service covers the full journey — from rapid tooling for early design validation, through bridge production, to full-scale mass manufacturing. Whether you need 50 test parts or 500,000 production units, our China factory has the equipment, materials, and experience to deliver.

Key benefits of injection molding:

  • Extremely repeatable — part-to-part variation is minimal
  • Low per-part cost at medium to high volumes
  • Wide choice of engineering-grade and commodity plastics
  • Little or no post-processing needed
  • Can produce complex geometries with inserts, threads, and undercuts

When to Choose Injection Molding

Good fit if you need:

  • ✓ 100+ identical plastic parts
  • ✓ Production-grade material properties
  • ✓ Tight tolerances on critical features
  • ✓ Complex shapes that 3D printing cannot handle
  • ✓ Surface finish options (textured, glossy, matte)

Consider CNC or 3D printing if:

  • ✗ You need fewer than 50 parts
  • ✗ You are still iterating the design weekly
  • ✗ You need parts in less than 5 days

Capabilities

Injection Molding Capabilities at a Glance

Real specs so you can plan your project with confidence.

SpecificationCapability
Mold typesRapid aluminum tooling (prototype) & P20/H13/S136 steel tooling (production)
Press tonnage50T to 1,000T clamping force
Maximum part sizeUp to 1,200 mm × 800 mm × 600 mm
Part weight range0.5 g to 8,000 g
Standard tolerance±0.05 mm (±0.002 in)
Tight toleranceDown to ±0.02 mm (±0.0008 in) on critical features
Wall thickness (typical)0.8 mm – 5.0 mm (varies by material)
Materials100+ thermoplastics, elastomers (TPE/TPU/LSR), engineering resins
Cavity optionsSingle-cavity, multi-cavity (2–64 cavities), family molds
Runner systemsCold runner, hot runner (semi-hot available)
Gate typesEdge, sub, pin-point, fan, tab, sprue, valve gate
T1 sample lead time10–15 business days (aluminum tooling); 15–25 days (steel tooling)
Production lead time3–10 business days after T1 approval
Volume range50 to 100,000+ parts per run; no strict MOQ
Mold lifeAluminum: 1,000–5,000 shots; P20 steel: 50,000–100,000 shots; H13/S136 hardened steel: 500,000+ shots
Surface finishesSPI A1–D3, MoldTech/VDI textures, polishing, bead blast, painting, pad printing, laser engraving
CertificationsISO 9001:2015; RoHS, REACH compliant materials available; inspection reports (FAI, CMM) on request
Mold ownership100% customer-owned; free mold storage and maintenance

Why YiguProto

Six Reasons Buyers Choose Our China Injection Molding Factory

We are not a trading company. We are the manufacturer. Here is what that means for you.

Fast Quotes, Fast Turnaround

Send us your 3D files. Get a detailed quote with DFM feedback within 24 hours. T1 samples ship in as little as 10 business days for rapid tooling projects.

Factory-Direct Pricing

No trading companies, no hidden markup. You work directly with the supplier that owns the molding machines, tool shop, and quality lab. Lower cost, better control.

Quality You Can Measure

ISO 9001:2015 certified. Every batch goes through incoming material checks, in-process monitoring, and final inspection. FAI reports and CMM measurement data available on request.

Engineering Support in English

Every project gets a dedicated engineer who reviews your design, answers questions, and sends regular progress updates. No more waiting days for a reply lost in translation.

100+ Materials, Custom Colors

From common ABS and polypropylene to engineering resins like PEEK, PPS, and glass-filled nylon. Custom Pantone color matching, UV stabilizers, flame-retardant grades, and food-safe options.

Your IP Is Protected

We sign NDAs before you share files. All customer designs are stored on secure servers and never shown to third parties. Your mold is your property, period.

See for Yourself — Get a Quote

Our Services

Injection Molding Solutions for Every Stage

From first prototypes to full production runs, we have a molding solution that fits your project.

Rapid Tooling & Prototype Molding

Lead time: 10–15 days | Volumes: 50–5,000

Aluminum molds cut fast and cost less than steel. Perfect for design validation, functional testing, and early market trials. Get real injection-molded parts in production-grade material — not 3D prints — so your testing is accurate.

Production Tooling

Lead time: 15–30 days | Volumes: 1,000–500,000+

Hardened steel molds (P20, H13, S136) built for high volume and long life. Multi-cavity and family molds available to reduce per-part cost. Hot runner systems for minimal waste and faster cycle times.

Overmolding & Insert Molding

Lead time: 15–25 days | Multi-material parts

Combine a soft TPE/TPU layer over a rigid plastic or metal substrate for grips, seals, and ergonomic surfaces. Or mold plastic around brass inserts, bushings, or threaded nuts for strong mechanical connections.

2K (Two-Shot) Molding

Lead time: 20–30 days | Dual-material/color

Mold two different materials or colors in a single cycle. Ideal for parts that need both a rigid structure and a soft-touch surface, or multi-color cosmetic components. Eliminates assembly steps.

Liquid Silicone Rubber (LSR) Molding

Lead time: 15–25 days | Medical & food grade

Heat-cured silicone parts with excellent flexibility, temperature resistance, and biocompatibility. Used for medical devices, baby products, seals, gaskets, and wearable components.

Micro & Precision Molding

Lead time: 20–30 days | Small, tight-tolerance parts

For small parts weighing less than 1 gram with features down to 0.1 mm. Used in electronics connectors, medical micro-components, and precision gears where accuracy is critical.

Materials

Choose from 100+ Plastic Materials

We stock all common commodity and engineering-grade thermoplastics. Need a resin not listed here? Just ask — we can source it.

Commodity Plastics

  • ABS — Tough, low-cost, easy to mold
  • PP (Polypropylene) — Flexible, chemical-resistant
  • PE (HDPE/LDPE) — Impact and chemical resistant
  • PS (Polystyrene) — Rigid, low cost, clear option
  • HIPS — High-impact polystyrene
  • PVC — Flame retardant, rigid or flexible

Engineering Plastics

  • PC (Polycarbonate) — Clear, impact resistant
  • PA6 / PA66 (Nylon) — Strong, wear resistant
  • POM (Delrin/Acetal) — Low friction, rigid
  • PMMA (Acrylic) — Optical clarity, scratch resistant
  • PBT / PET — Electrical properties, good for connectors
  • PC/ABS blend — Balanced strength and flow

High-Performance Plastics

  • PEEK — Extreme temperature and chemical resistance
  • PPS — High heat, chemical resistant
  • PEI (ULTEM) — Flame retardant, high strength
  • PSU / PPSU — Medical grade, steam sterilizable
  • PTFE (Teflon) — Ultra-low friction
  • PAI (Torlon) — Highest strength thermoplastic

Elastomers & Flexible Materials

  • TPE — Soft touch, Shore 20A–95A
  • TPU — Abrasion resistant, flexible
  • LSR (Silicone) — Medical/food grade, heat resistant
  • EVA — Soft, lightweight, foamable
  • TPEE — Flexible, fatigue resistant

Glass-filled, carbon-filled, UV-stabilized, flame-retardant (UL94 V-0/V-1/V-2), and food-safe grades available.

Custom Pantone/RAL color matching available on production orders.

Surface Finishes

Make Your Parts Look and Feel Right

Choose from a wide range of surface finishes to match your product's look, feel, and function.

SPI-A (Glossy)

Diamond-buffed finish. High gloss, mirror-like surface. A1, A2, A3 grades. Great for cosmetic parts and lenses.

SPI-B (Semi-Gloss)

Grit sandpaper finish (B1–B3). Fine, smooth surface with low shine. Most common for industrial parts.

SPI-C (Matte)

Stone-ground finish (C1–C3). Flat matte look that hides tool marks and minor defects.

SPI-D (Textured)

Dry-blast finish (D1–D3). Rough, textured surface. Good for grips and hiding ejector marks.

MoldTech / VDI Texture

EDM or chemical-etched textures. Leather grain, geometric patterns, fine to coarse.

Painting & Coating

Spray painting, silk screening, pad printing, UV coating, rubberized soft-touch paint.

Industries

Trusted by Companies Across These Industries

Our injection molded parts end up in products used around the world every day.

Automotive

Interior trim, brackets, connectors, sensor housings, under-hood components in glass-filled nylons and PP.

Medical & Dental

Surgical instrument handles, device housings, fluid delivery components in medical-grade PC, PEI, and LSR.

Consumer Goods

Appliance parts, houseware, toys, cosmetic packaging, kitchen tools in ABS, PP, PMMA with custom colors.

Electronics

Enclosures, bezels, connectors, cable strain reliefs, switch components in PC/ABS, PBT, PA.

Industrial

Gears, bushings, valve bodies, pump housings, structural brackets in POM, PA, PEEK, PPS.

New Energy

Battery housings, solar panel connectors, EV charging components in flame-retardant and UV-stabilized materials.

How It Works

From CAD File to Finished Parts in 6 Simple Steps

A clear, proven process with no surprises. You always know where your project stands.

1

Upload Your Design

Send us your 3D CAD file (STEP, STP, IGES, or X_T) along with your material, quantity, and finish requirements.

2

Get Quote & Free DFM

Within 24 hours, you get an itemized quote plus a DFM report that flags potential issues and suggests improvements.

3

Approve & Pay

Review the quote, ask questions, request changes. Once approved, place your order and we start cutting steel.

4

Mold Making & T1 Samples

We build the mold in-house, run T1 (first trial) shots, inspect them, and send you sample photos and parts for approval.

5

Production Run

After you approve T1 samples, we run full production. Every batch is inspected for dimensions, appearance, and function.

6

Pack & Ship

Parts are packed for safe transport, shipped via your preferred carrier (DHL, FedEx, UPS, sea freight), and tracked to your door.

Start Your Project Today

Design Tips

Simple Design Rules That Save You Money

Good design for manufacturing (DFM) cuts cost, reduces defects, and speeds up delivery. Here are the basics.

Design FeatureRecommendationWhy It Matters
Wall thicknessKeep walls even; 1.5–3.0 mm is ideal for most materialsUneven walls cause sink marks, warpage, and voids
Draft angles1°–2° minimum on all vertical walls; 3°–5° for textured surfacesParts eject cleanly without scuffing or sticking
Corner radiiUse inside radii of at least 0.5 mm; avoid sharp cornersSharp corners create stress concentrations and weaken parts
RibsRib thickness = 40–60% of wall thickness; add draft to ribsThick ribs cause sink marks on the opposite surface
BossesBoss wall thickness ≤ 60% of main wall; attach to ribs or wallsIsolated thick bosses sink and create voids
UndercutsAvoid when possible; use side actions or pass-through cores if neededUndercuts require complex tooling and add cost
Gate locationPlace gates on non-cosmetic surfaces; consider flow lengthGates leave a vestige; poor gate location causes weld lines
Ejector pinsPlan for ejector pin marks on non-visible surfacesEjector pins push the part out and leave small circular marks

Not sure if your design is ready? Send it to our engineers for a free review.

Trusted Worldwide

Companies Around the World Rely on Our Molding Service

★★★★★

"We moved our tooling from another supplier to YiguProto and the difference was night and day. DFM feedback was spot on, T1 samples were nearly perfect, and production ran smoothly. Communication was fast throughout."

— Procurement Manager, U.S. consumer electronics company

★★★★★

"As a startup with limited budget, we needed a supplier who could do low-volume runs without killing us on tooling cost. YiguProto's rapid tooling option let us test our product in real material before committing to production."

— Founder, European hardware startup

★★★★★

"The quality reports they send before shipment give us confidence. We've been working with them for over three years now across multiple projects, and they consistently deliver on spec and on time."

— Engineering Director, Australian industrial equipment manufacturer

12+
Years in Manufacturing
3,000+
Molds Built
50+
Countries Served
ISO 9001
Certified Factory

FAQ

Frequently Asked Questions About Injection Molding

Answers to the questions buyers ask us most often.

Upload your 3D CAD files (STEP, STP, IGES, or X_T format) and tell us your material, quantity, and finish needs. Most quotes come back within a few hours on business days, and never more than 24 hours. Every quote includes free DFM (design for manufacturing) feedback.
We prefer STEP (.stp, .step) or IGES (.igs, .iges) files because they give clean geometry and accurate dimensions. We can also work with SolidWorks (.sldprt), Inventor (.ipt), Creo/ProE (.prt), Parasolid (.x_t), and STL files. If you only have 2D drawings (PDF or DWG), send those too — they are helpful for tolerances and notes.
For rapid aluminum tooling, T1 (first article) samples are ready in 10–15 business days. For production steel tooling, T1 takes 15–25 business days depending on complexity and number of cavities. After you approve T1 samples, production runs typically take 5–10 business days. We will give you a specific timeline with your quote.
There is no strict MOQ. We support prototype runs as low as 50 pieces for rapid tooling projects. For production tooling, typical starting quantities are 500–1,000 pieces, but we are flexible. Keep in mind that the mold is a one-time cost, so the per-part price drops significantly at higher volumes.
You own the mold 100%. The tooling price you pay covers the full cost of building the mold. We store and maintain it for free at our factory for as long as you run production with us. If you ever need to move production elsewhere, we will ship the mold to you.
Yes. For low volumes (50–5,000 parts), we use aluminum molds that cut fast and cost less. For medium to high volumes (1,000–500,000+ parts), we build hardened steel molds that last for hundreds of thousands of shots. Many customers start with aluminum tooling for validation, then switch to steel for production.
Our standard tolerance is ±0.05 mm (±0.002 in) on most features, following general plastic molding standards (similar to DIN 16901 or ISO 2768 medium). For critical dimensions, we can hold tolerances down to ±0.02 mm (±0.0008 in). If you have specific tolerance requirements, note them on your drawing and we will confirm feasibility during DFM review.
Mold cost depends on part size, complexity, number of cavities, material of the mold (aluminum vs. steel), and surface finish. Simple, small aluminum molds for prototype parts often start around $1,000–$3,000. Production steel molds for complex parts can range from $5,000 to $50,000+. The best way to get an accurate price is to send us your CAD file for a free quote.
Yes. All customer files, designs, and project details are treated as strictly confidential. We are happy to sign your NDA before you share any sensitive information. Our staff follow internal data security protocols, and we never share or display customer parts without permission.
Yes, every quote comes with a free DFM review. Our engineers check your part for common molding issues: wall thickness uniformity, draft angles, undercuts, gate location, sink marks, weld lines, and ejector pin placement. If we see anything that could cause problems, we will tell you before you pay for tooling.
Yes. We can match Pantone, RAL, or custom color standards. For production runs, we can use pre-colored resin or add masterbatch colorant to natural pellets. Color sample chips can be provided for approval before full production. Note that custom color matching typically adds a small setup fee and slightly longer lead time.
We ship worldwide. For small batches and samples, we use DHL, FedEx, or UPS express (typically 3–7 days door to door). For large production orders, we offer air freight (5–10 days) and sea freight (25–40 days) at lower cost. We can also ship to your freight forwarder in China if you have one.

Ready to Get Your Plastic Parts Made?

Upload your CAD file today and get a factory-direct quote with free DFM analysis within 24 hours. No obligation. No middleman. Just quality parts from a China manufacturer you can trust.

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