• OVERMOLDING SERVICES

Custom Overmolding Services, Soft Grips, Seals, and Multi Material Parts

Two shot (2K) and multi shot overmolding in TPE, TPU, or silicone rubber over rigid plastic substrates. Superior ergonomics, vibration damping, and watertight IP68 sealing.

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Substrate Chemical Bonding

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ISO 9001:2015 Certified

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2K and Insert Overmolding

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Injection Molding Technical Resources

What Is Precision Injection Molding? The Complete GuideJuly 24, 2026

Polypropylene Injection Molding: The Complete GuideJuly 24, 2026

Choosing Mold Steel: P20 vs H13 vs S136July 24, 2026

Injection Molding
for Various Industries

From 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 Control

Quality 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.

Image (Engineer reviewing CNC machining design plans)

Image (CNC machine manufacturing metal part)

Frequently Asked Questions

Injection Molding Blueprint & CAD Review

What makes Sango different from other manufacturing platforms or intermediaries?

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.

How fast can Sango deliver?

What surface finishes and colors are available?

Material Options for
Custom Overmolding Services, Soft Grips, Seals, and Multi Material Parts

Explore Products

Commodity Plastics

Acrylonitrile Butadiene Styrene (ABS)

Polypropylene (PP) & Polyethylene (PE/HDPE/LDPE)

Polystyrene (PS) & High Impact Polystyrene (HIPS)

Surface Finishes & Post-Processing

Finishes mapped directly from CMS.

SPI Mold Finishes

SPI GradesSPI-A, SPI-B, SPI-C, SPI-D

Finishing LookHigh Gloss, Semi-Gloss, Matte, Textured

Surface PolishDiamond Polish, Fine Grit, Sandblasted

Custom Textures

Mold-Tech TexturesStandard MT grain & automotive leather textures

Bead BlastingUniform satin matte & non-glare cosmetic finish

Custom EDM TexturesPrecision spark erosion & bespoke micro-reliefs

Secondary Finishing Services

Surface DecorationPad printing, silk screening & laser engraving

Assembly & InsertsUltrasonic welding & heat-stake threaded inserts

Protective CoatingsEMI/RFI shielding, spray painting & UV topcoats

Plastic Injection Molding Services for Custom Parts

SANGO 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 Custom Overmolding Services, Soft Grips, Seals, and Multi Material Parts
Process Work

At SANGO, we make custom services simple and efficient.

Upload CAD file

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Start by choosing your preferred manufacturing process, then upload your design file.

Get a Quote

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Select materials, surface finishes, and shipping options. Receive an online injection molding quote and manufacturability feedback in one day.

Review T1 Sample

/03

We produce a T1 sample for your approve. Check every detail to match your specifications. This step usually takes two weeks.

Production Begins

/04

After approving the sample, we move to full-scale production, maintaining high standards of quality and precision.

Delivery

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We ship your custom injection molded parts from our China injection molding facilities to your location, ready for immediate use.

Ready to Start

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Start your injection molding project with SANGO. Experience efficiency like never before!

Injection Molding Manufacturing Network

SANGO 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

Low-Volume Molding

Insert Molding

Injection Mold Tooling

Vacuum Forming

Injection Molding Capabilities

Our 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.

Image (Digital caliper measuring a precision machined part)

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 Molding

SANGO’s injection molding infrastructure supports high-precision component production across automotive, medical devices, consumer electronics, and industrial equipment. From rapid prototype tooling to high-volume production runs, our validated press controls maintain strict dimensional tolerances and consistent part-to-part repeatability.

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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