Injection Molding Capabilities
From mold design to a packed pallet, your plastic part runs under one roof in our own factory.
Our Injection Molding Process
You don't coordinate a mold maker, a molding factory and a packing house separately. Send us a drawing or a sample, and we run the seven steps below in-house.
Injection Molding Step by Step
Here is what actually happens at each stage: the checks, the decisions, and the order we do them in.
Mold Design
We turn your drawing or a sample into a mold design ready to cut in steel. We've been doing this since our first mold in 1996.
Analyze CAD or Sample
We start from your 3D file or a physical sample to understand the part and its critical features.
DFM Review
We walk the part through the points that decide whether it'll mold right:
Define the Mold
With the design settled, we lock how the tool is built:
Mold Making
We cut the tool in hardened steel, built to the shot life we agreed on. Some molds from 1996 still run today.
Prepare the Steel
Rough-cut and heat-treat the tool steel grade chosen for your shot life.
Precision Machining
Four operations take the steel to its final geometry:
Assemble & Fit
Cavity, core and moving parts are assembled and bench-tested before any shot:
Injection Molding
We dial in the process, then run to a tight, repeatable window on 50 to 1,000T machines.
Setup & Material
Mount the mold, dry the resin, and load the correct material lot.
Process Tuning
We tune the molding parameters until parts are consistent:
Stable Production
Volume runs hold parts within spec, with in-process checks:
Secondary Processing
We print, mark and color-match in-house, and the parts ship finished.
Clean & Mask
Surfaces are cleaned and masked for the areas to be decorated.
Apply the Finish
We decorate in-house with the method your part calls for:
Match the Color
Color is matched and signed off against your standard:
Assembly
We turn loose parts into a finished, ready-to-use product.
Kit the Components
Molded parts, inserts and bought-in items are gathered per the BOM.
Join the Parts
Components are joined with the right method for the design:
Sub-assembly & Check
We build the sub-assembly and function-check it before it moves on.
Quality Control
Measured against your drawing at first article and through the run, with records on file.
First Article
First parts are measured against your drawing before the run is released.
Measure & Test
We inspect dimensions and material as the part requires:
Document & Release
Each batch is traceable and released with documentation:
Packaging
Packed to your spec, with the paperwork that ships with the goods.
Bag & Label
Parts are bagged and labeled to the packing standard you provide.
Box for the Channel
We pack for retail or bulk, whichever your order needs:
Documents & Dispatch
Export documents are prepared and goods ship on your terms:
How long does a project take?
Most new projects look the same on the calendar: a quote with DFM feedback in about three business days, tooling in roughly four to six weeks through the first T1 sample, then production that scales with your order. Tooling is the main lead time. Once a mold is approved and running, repeat orders ship much faster.
Insert Molding & Overmolding
The steps above cover a single-material part. Some designs need more: insert molding (metal molded into the part) or overmolding (a soft-touch layer over a rigid core). We run both in-house, and each has its own guide below.
Insert Molding
Plastic molded directly around pre-placed metal inserts such as brass bushings, M4 inserts and pins, so the part comes out as one finished assembly. Common in our gas-equipment housings and glass-filled nylon parts.
Learn about insert molding →
Overmolding
A soft second material, usually TPE, molded over an already-rigid part for grip, sealing or a soft-touch surface. We run it in two stages: mold the rigid base first, then over-mold the soft layer.
Learn about overmolding →Injection Molding Equipment
| Machines | 50T to 1,000T injection molding machines across our Ningbo factory and partner facility in Hefei |
| Standard tolerance | ±0.05 mm, down to ±0.02 mm on critical features |
| Tooling | P20, H13 and 718H tool steels; single, multi-cavity and family molds |
| Materials | PP, PE, PS, PVC, ABS, ASA, PC, PA6, PA66, PA66+30%GF, POM, TPE, EPDM/CR rubber, PEI, and more |
| Color matching | European RAL standard and Pantone matching |
| Secondary work | Ultrasonic welding, hot stamping, silk-screen printing, assembly |
| Volume | No minimum order quantity, from prototype runs through to over one million units a year |
| Quality system | ISO 9001:2015 certified production with batch traceability |
Injection Molding Materials
We run a focused set of commodity, engineering, and specialty materials, from everyday PP and ABS through to glass-filled nylon and high-temperature PEI. Pick one to see the grades we actually run, typical parts, and colors. Don't see what you need? Just ask.
PP (Polypropylene)
PP is light, resists chemicals, and flexes again and again without cracking, which is exactly what a living hinge needs. It also survives repeated autoclaving, so it's our default for suction catheters and reusable consumables.
| Common grades | Formosa 1250Formosa (Ningbo) 1250T30SPP+GF (on request) |
| Typical use | Suction cathetersThermoforming nozzlesProbesCaps & containers |
| Color options | BlueWhiteGreenBlackNatural+ custom on request |
| Relative cost | $$$$Economical |
| Lead time | ≈ 2-4 weeks |
PE (Polyethylene)
PE is the cheap, forgiving one: soft enough for press-fit caps and plugs, tough enough to protect a needle tip, and it molds with a smooth surface.
| Common grades | LDPE Q281 |
| Typical use | Screw capsCylinder protective capsPlastic plugsNeedle sheaths |
| Color options | NaturalWhiteBlackRed+ custom on request |
| Relative cost | $$$$Economical |
| Lead time | ≈ 2-4 weeks |
PS (Polystyrene)
PS molds glass-clear, stays rigid and holds both its dimensions and fine detail. We use GPPS for transparent flow tubes and clear single-use parts.
| Common grades | Trinseo Styron 666H |
| Typical use | Flowmeter inner tubesClear dental traysTongue scrapersDisposable specula |
| Color options | ClearYellowGreenRedPurple+ custom on request |
| Relative cost | $$$$Economical |
| Lead time | ≈ 2-4 weeks |
PVC (Polyvinyl Chloride)
PVC takes knocks, resists chemicals and is flame-retardant. We use it for protective housings that need toughness at low cost.
| Common grades | Standard PVC |
| Typical use | Pressure-gauge guards |
| Color options | Black+ custom on request |
| Relative cost | $$$$Economical |
| Lead time | ≈ 2-4 weeks |
ABS (Acrylonitrile Butadiene Styrene)
ABS is our workhorse for knobs, caps and housings. It takes impact well, finishes to a high gloss, chrome-plates cleanly and colors easily. When a part needs more toughness, we move to an ABS/PA alloy.
| Common grades | Kumho 750NSWHaijiang ABSDG417ABS/PA alloy 765A |
| Typical use | Handwheels & capsDIN-rail clipsTerminal socketsDental trays |
| Color options | WhiteBlackGreyRedBlueOrangeYellowGreenChrome-plated+ custom on request |
| Relative cost | $$$$Moderate |
| Lead time | ≈ 2-4 weeks |
ASA (Acrylonitrile Styrene Acrylate)
Think of ASA as ABS that can live outdoors: the color and gloss hold up under UV and weather. We mold it for exposed terminal-interface parts.
| Common grades | ASA L1941 |
| Typical use | Terminal socket segmentsInterface cover plates |
| Color options | WhiteBlackGreyLight greyYellowBlue+ custom on request |
| Relative cost | $$$$Moderate |
| Lead time | ≈ 2-4 weeks |
PC (Polycarbonate, incl. PC/ABS)
PC is the clear material to pick when the part also gets knocked around or runs hot. We mold glass-clear PC for flow components, and PC/ABS where we want extra toughness with easier molding.
| Common grades | Lotte 1100Chimei PC-110Deerlon CS103 (PC/ABS) |
| Typical use | Flowmeter outer tubesCompressor connectorsTongue cleanersLocating-pin holders |
| Color options | ClearTransparent blueBlackYellow+ custom on request |
| Relative cost | $$$$Premium |
| Lead time | ≈ 2-4 weeks |
PA6 (Nylon 6)
PA6 is a tough nylon that wears slowly, survives repeated loading and takes color well. Most of ours goes into handwheels in bright colors.
| Common grades | Zhuangyuan 1013B |
| Typical use | Handwheels |
| Color options | GreenBlueRedGreyBlack+ custom on request |
| Relative cost | $$$$Moderate |
| Lead time | ≈ 2-4 weeks |
PA66 (Nylon 66)
PA66 is a step up from PA6 in stiffness, heat and wear. We reach for it on sealing and load-bearing precision parts, mostly in DuPont Zytel grades.
| Common grades | DuPont Zytel 101LDuPont Zytel 103HSLDuPont Zytel E101L |
| Typical use | Seal ringsDiaphragm backplatesGas nozzlesSliding washersFuse housingsHandwheels |
| Color options | NaturalOff-whiteBlack+ custom on request |
| Relative cost | $$$$Premium |
| Lead time | ≈ 2-4 weeks |
Glass-Filled Nylon (PA6+GF / PA66+GF)
Adding glass fiber (typically 30%) turns nylon into a structural material: stiffer, stronger and far more dimensionally stable. We also run black and recycled versions.
| Common grades | PA6+GF30%PA66+GF30%DuPont 70G33LDuPont 70G330LPA6+GF5% |
| Typical use | Structural handwheelsTop capsGasketsInsert housings |
| Color options | BlackGreyLight blueRedNatural+ custom on request |
| Relative cost | $$$$Premium |
| Lead time | ≈ 2-4 weeks |
POM (Acetal)
POM is what we pick when parts slide or move against each other. It's slippery, stiff, and holds its dimensions under repeated load, which suits valve cores and mechanism parts.
| Common grades | Yuntianhua M90 |
| Typical use | Safety-valve coresValve stem guidesCheck-valve seatsDiaphragm plates |
| Color options | NaturalBlackRed+ custom on request |
| Relative cost | $$$$Moderate |
| Lead time | ≈ 2-4 weeks |
TPE (Thermoplastic Elastomer)
TPE is the soft one, usually Shore A 55-60, and it's recyclable. We mold it into protective covers and over-grips.
| Common grades | TPE Shore A 55-60 |
| Typical use | Gauge protective coversSoft housings |
| Color options | Black+ custom on request |
| Relative cost | $$$$Moderate |
| Lead time | ≈ 2-4 weeks |
Rubber (EPDM / CR)
For seals we compression- and transfer-mold EPDM and CR rubber. Both stay elastic across a wide temperature range and stand up to chemicals, and we compound to the hardness your spec calls for.
| Common grades | EPDM Shore 80Neoprene/CR Shore 60General compound |
| Typical use | Gaskets & washersO-ringsFlowmeter plug heads |
| Color options | BlackNatural+ custom on request |
| Relative cost | $$$$Moderate |
| Lead time | ≈ 2-4 weeks |
PEI (Ultem, CF-Filled)
PEI sits at the top of our material range. Carbon-fiber filled, it keeps its strength and dimensions at temperatures that would soften most plastics, which is why we save it for hot-zone parts.
| Common grades | PEI + 12% CF |
| Typical use | Injection extension tips |
| Color options | Black+ custom on request |
| Relative cost | $$$$High-performance |
| Lead time | ≈ 2-4 weeks |
Quality Control & Documentation
We check parts against your drawing at first article and through the full production run, and keep the records to prove it. Inspection reports, material certificates, and compliance documents come with your order on request.
Visual Inspection
Parts are checked against your approved sample for color, gloss, and surface finish, and screened for short shots, sink marks, and flash. Color is matched to your RAL or Pantone target.
Dimensional Inspection
Calipers, micrometers, and height gauges handle everyday features; a CMM covers complex geometry. We hold ±0.05 mm as standard, down to ±0.02 mm on critical dimensions.
Functional & Fit Inspection
We confirm the part works as designed with thread go/no-go gauges, mating fit checks, and trial assembly. If a threaded hole, snap-fit or seal is going to cause trouble on your line, we want to find it on ours first.
Material Verification
Resin is traced lot by lot, with a certificate of analysis available per batch. We mold in named grades: the material in your part is the one you specified, and the paperwork can prove it.
First Article Inspection
Before a new mold goes to volume, we measure every dimension on the first articles against your drawing and write it up. Production starts only after that report is approved.
Compliance Reports
Need RoHS, REACH, or FDA material documentation? We supply compliance statements and test reports on request to support your regulatory filings and customs clearance.
Component-Level OEM, Documented
We operate ISO 9001:2015 certified production and provide material traceability, a certificate of analysis per batch, and First Article Inspection on every new mold.
Have a Part to Make?
Send a drawing, a sample, or a 3D file. You'll get a quote back within three business days, with free DFM feedback included.
Request a Quote →Injection Molded Products
A few of the products we mold every day. Click any part to see how it's made.
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