High-quality plastic parts from prototype tooling to full-scale mass production. T1 samples delivered in as fast as 2 weeks, with no Minimum Order Quantity (MOQ).
Custom Injection Molding — Fast Tooling, Scalable Production
Injection Molding
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ISO 9001:2015 Certified✓
98% On-Time Delivery✓
100,000+ Parts MadeExplore All Capabilities
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Molding? The Complete GuideJuly 24, 2026
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Surface Finishes & Post-ProcessingSurface treatment options adhering to SPI standards to meet functional and cosmetic requirements.
Automotive
Aerospace
Medical
Consumer Products
Robotics
Automation
for Various IndustriesFrom automotive interiors to medical device housings, SANGO molds parts to the tolerances and material specs each industry actually requires — not a one-size-fits-all process.
Injection Molding Quality ControlQuality gets built in at mold design, not inspected in at the end. Cross-team DFM reviews and in-process controls hold first-pass yield at 90% or better across every production run.
⬡Mold & Pre-Production InspectionMold flow simulation and pre-production checks catch defects before steel is cut. Engineers optimize gate location, material flow, and cooling layout for consistent fill on every cavity.
◎In Process Quality ControlInjection speed, pack pressure, and melt temperature are logged shot by shot and held within validated process windows, so part 10,000 matches part one.
→Final InspectionEvery batch is measured against your drawing with CMM and colorimeter data before it ships — dimensions to ±0.02 mm, cosmetics, and functional fit all included in the report.
We run injection molding directly - our own process engineers review your design, our own tooling shop builds and maintains the mold, and our own press floor runs production. There's no broker relaying files between you and a third-party shop, which means design feedback, DFM changes, and quality issues get resolved in one conversation instead of passing through a middleman.
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Commodity PlasticsEngineering PlasticsHigh-Performance PolymersElastomers & RubberAdditives & Fillers
Acrylonitrile Butadiene Styrene (ABS)
Polypropylene (PP) & Polyethylene (PE/HDPE/LDPE)
Polystyrene (PS) & High Impact Polystyrene (HIPS)
Material Options for Injection Molding
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SPI Mold Finishes
SPI GradesSPI-A, SPI-B, SPI-C, SPI-D
Finishing LookHigh Gloss, Semi-Gloss, Matte, Textured
Surface PolishPolish, Medium Polish, Fine Polish, Sandblasted
Custom Textures
Mold-Tech textures
bead blasting
custom EDM textures
Secondary Finishing Services
SPI GradesSPI-A, SPI-B, SPI-C, SPI-D
Surface FinishingProfessional painting, printing, & silk screening
Laser EngravingDurable marking for logos, labels, and identification
Plastic Injection Molding Services for Custom PartsSANGO takes your part from a handful of prototype units to full production runs on the same tooling philosophy, with T1 samples ready in as fast as 2 weeks. Our China-based facilities run 90 to 830-ton presses, so small precision components and large structural housings both stay in-house. Precision mold tooling, overmolding, and insert molding all run through the same DFM review before steel is cut, so bond compatibility and wall thickness are checked once rather than per process. One partner across design, tooling, and production means fewer handoffs, tighter part consistency, and a clearer path to scaling volume.
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How Does SANGO Injection Molding Process WorkSix steps from CAD file to shipped parts, with a DFM review and a T1 sample built into the middle of the process — not skipped to save time. Each stage below is a checkpoint where you approve before we move to the next.
Once you sign off on the sample, we move to full production with the same process parameters logged and held on every shot.Production Begins/04
Parts ship from our China facilities packed for transit, inspection report included, ready for immediate use or assembly.Delivery/05
Send your CAD file and we'll return DFM feedback and pricing within one business day.Ready to Start/06
Start by choosing your preferred manufacturing process, then upload your design file.Upload CAD file/01
We build a T1 sample for your sign-off and check it against your drawing dimension by dimension. Typically about two weeks from tooling approval.Review T1 Sample/03
Select materials, surface finishes, and shipping options. Receive an online injection molding quote and manufacturability feedback in one day.Get a Quote/02
Injection Molding Manufacturing NetworkSANGO injection molding network combines 50 advanced machines capable of 90 to 830 tons with experienced project managers to handle projects of any size or complexity. We produce plastic molded prototypes and production parts with global shipping from China’s injection molding supplier.
50+Machines Set
120+Countries & Regions Served
20k+Customers Worldwide
Injection Molding Factory in China
Injection Molding Machine
Injection Molding Factory
Injection Mold
Injection Molding CapabilitiesOur injection molding services cover every stage, from design to delivery. We produce prototypes and large-scale parts with tight tolerances, certified quality, and quick lead times for global customers.
Maximum Part Size1200×1000×500 mm
StandardsDescription
Minimum Part Size5×5×5 mm
Part to Part Repeatability+/- 0.1 mm
Mold CavitiesSingle-cavity, multi-cavity, family molds
Available Mold TypesSteel and aluminum — <1K / 5K / 30K / 100K+ uses
Mold Cavity Tolerances+/- 0.02 mm
Secondary OperationsTexturing, pad printing, laser engraving, inserts, assembly
UndercutsY-type, L-type
Wall Thickness0.5 mm to 5 mm
Draft0.5° to 2°
Ribs / Gussets0.5 mm to 3 mm thick
BossesDiameter 3 mm to 10 mm
Lead TimeWithin 15 working days
Applications of Injection MoldingInjection molding is huge in making a ton of products—anything from car parts to medical devices. It’s super efficient because it can produce lots of identical plastic parts with tight tolerances, all at a low cost per part. That’s why so many industries rely on it for mass production. Whether it’s a simple or complex design, it keeps quality high and production fast.
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Advantages of Injection MoldingHigh-volume, consistent productionHigh-volume, consistent productionHigh-volume, consistent productionHigh-volume, consistent production
Disadvantages of Injection MoldingHigh upfront tooling costsDesign limitationsLonger lead timesNot cost-effective for low-volume runs
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