Custom Plastic Injection Molding Services
Injection molding services in China
Injection Mold Tooling
Injection mold tooling is the precision-made core of the molding process. It enables consistent, high-volume production by shaping molten plastic into exact, repeatable part geometries.
Plastic Injection Molding
This process melts thermoplastic resin and injects it into a mold cavity under pressure. The plastic cools and solidifies into a finished part—ideal for producing complex shapes with speed and accuracy.
Overmolding
Overmolding bonds two materials by molding one over another. It improves part function, grip, and aesthetics while reducing assembly steps and increasing design flexibility.
Insert Molding
Insert molding encapsulates metal or other components in plastic during molding. It merges materials in a single process, enhancing part strength, alignment, and manufacturing efficiency.
Manage Your Machining Needs with MachMaster
Plastic Injection Molding Materials
We offer a wide selection of industrial-grade materials for custom injection molding, suitable for both prototypes and full-scale production runs. From standard resins to engineering plastics, you’ll find options to match your part’s performance and appearance needs. If a specific material is not available locally, we also support customer-supplied materials for special requirements.
Tooling Materials for Injection Molding
Before starting low- or high-volume injection molding production, high-tolerance CNC-machined molds are required. We offer a range of durable tooling materials to meet different production needs and part specifications.
Common materials include:
Tool Steel: P20, H13, S7, NAK80, S136, S136H, 718, 718H, 738
Stainless Steel: 420, NAK80, S136, 316L, 316, 301, 303, 304
Injection Molding Materials We Support
We offer a wide range of injection molding materials to match your part’s functional and performance requirements—whether you need high impact strength, thermal stability, rigidity, or chemical resistance.
Commonly used plastics include:
General-purpose plastics:
ABS, PP, PS, HDPE, LDPE, PMMA
Engineering plastics:
PC, POM, PA (Nylon), PET, PU
High-performance materials:
PEEK, PPA, PTFE (Teflon)
Thermoset Materials for Specialized Applications
Thermoset plastics are used in injection molding when high heat resistance, chemical stability, or structural rigidity is required. These materials form permanent molecular bonds during curing, making them ideal for high-performance and electrical applications.
Available options include:
Liquid Silicone Rubber (LSR) – Flexible, biocompatible, and ideal for medical and sealing parts
Epoxy – High strength and excellent chemical resistance
Polyurethane – Durable with good impact and abrasion resistance
Phenolic – Excellent dimensional stability and heat resistance, widely used in electrical components
Speed Meets Precision at MachMaster
See our team, process, and precision in action at Xiamen MachMaster Co., Ltd—where every part is backed by expertise, systems, and measurable results.
Injection Mold Surface Finishes
We provide a range of SPI finishes and VDI textures tailored for plastic injection molds. Please indicate your preferred surface finish when submitting your quote to ensure accurate production.
| SPI Finish Standards | Surface Roughness RA (mm) | Finishing Method | Texture | Steels Recommended |
|---|---|---|---|---|
| A1 | 0.012 to 0.025 | 6000 Grit Diamond | Super High Glossy Finish | S136 (54 HRC) or 8407(52 HRC) |
| A2 | 0.012 to 0.025 | 3000 Grit Diamond | S136 (54 HRC) or 8407(52 HRC) | Super High Glossy Finish |
| A3 | 0.05 to 0.10 | 1200 Grit Diamond | Normal Glossy Finish | S136 (300 HB) or 718 H |
| B1 | 0.05 to 0.10 | 600 Grit Paper | Fine Semi-glossy Finish | 718 H |
| B2 | 0.10 to 0.15 | 400 Grit Paper | Medium Semi-glossy finish | 718 H |
| B3 | 0.28 to 0.32 | 400 Grit Paper | Normal Semi-glossy finish | 718 H |
| C1 | 0.35 to 0.40 | 600 Grit Stone | Fine Matte Finish | 718 H |
| C2 | 0.45 to 0.55 | 400 Grit Stone | Medium Matte Finish | 718 H |
| C3 | 0.63 to 0.70 | 320 Grit Stone | Normal Matte Finish | 718 H |
| D1 | 0.80 to 1.00 | Dry Blast Glass Bead | Satin Textured Finish | 718 H |
| D2 | 1.00 to 2.80 | Dry Blast | Dull Textured finish | 718 H |
| D3 | 3.20 to 18.0 | Dry Blast | Rough Textured Finish | 718 H |
Real-World Uses of Injection Molding
Injection molding is used to produce high-precision parts across industries such as electronics, automotive, medical, and home appliances. It supports plastics, rubber, and elastomers—enabling complex geometries, tight tolerances, and consistent performance.
Why Our Injection Molding Stands Out
Our injection molding service combines precision tooling, flexible material options, and consistent quality—making it ideal for both prototyping and large-scale production.
Precision Mold Manufacturing
We use CAD/CAM/CAE technologies and high-quality mold steel to produce durable, high-precision molds. This ensures dimensional accuracy, long mold life, and reduced defect rates in production.
Diverse Material Capabilities
We support a wide range of thermoplastics including ABS, PC, PA, POM, PP, TPU, and more. Our team recommends the most suitable materials based on your part’s functionality and performance needs.
Strict Quality Control
Our ISO 9001-certified system covers every step—from raw material sourcing to molding and inspection—ensuring stable performance, surface quality, and dimensional accuracy.
Fast Response & On-Time Delivery
We handle urgent and short-lead-time orders with lean production management and backup resources, ensuring timely delivery even under unexpected demands.
Need-to-Know: Injection Molding
What Is Plastic Injection Molding?
Plastic injection molding is a manufacturing process in which molten thermoplastic is injected into a mold cavity under high pressure, then cooled and solidified into the desired shape. It is widely used for producing high-precision parts in industries such as electronics, automotive, consumer goods, and medical devices.
What Are the Advantages of Injection Molding?
Injection molding enables fast, automated production with high dimensional accuracy and repeatability. It supports complex part geometries, minimizes material waste, and works with a wide range of plastics. It’s ideal for medium to high-volume production with excellent cost efficiency and environmental recyclability.
What Are the Typical Applications of Injection Molding?
Injection molding is used in a wide range of industries:
– Automotive: dashboard panels, interior trims
– Consumer Electronics: device housings, buttons
– Medical Devices: syringes, enclosures
– Home Appliances: parts for washing machines, fans, and TVs
– Packaging & Consumer Goods: containers, toys, kitchenware
– Aerospace: seats, ducts, lightweight interior parts
What Are the 6 Main Stages of the Injection Molding Process?
Preparation: Machine and material setup
Melting: Plasticized into uniform melt
Injection: High-pressure filling of mold
Cooling: Curing inside the mold
Demolding: Part ejected from the mold
Post-processing: Trimming, cleaning, inspection, and packaging
What Are the 4 Basic Stages of an Injection Molding Cycle?
The four core steps include:
Clamping
Injection
Cooling
Ejection
Each cycle can last from a few seconds to a couple of minutes, depending on part size and complexity.
How Long Does Injection Molding Take?
Once the mold is built, injection molding is extremely fast. Cycle times can be as short as 10 seconds, making it ideal for medium and high-volume production of 10,000 to 100,000+ parts.
How Is the Cost of Injection Molding Calculated?
Pricing is based on material cost, tooling, machining time, finishing, and packaging, with a profit margin added. Part complexity, material type, tolerances, and order volume also influence the total cost.
How Much Does Injection Molding Cost in China?
In China, basic injection molding costs range from $5–$10/hour for simple plastic parts, and $10–$30/hour for high-precision or multi-axis machining. This is significantly more cost-effective compared to rates in Europe or the U.S.
What Are the Typical Tolerances for Injection Molded Parts?
At MachMaster, we follow ISO 20457 (previously ISO 2068-c) standards for injection molding tolerances. Depending on material and geometry, we can also meet tighter custom tolerance requirements.
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