Custom Injection Molding Services
We deliver custom injection molding that turns your designs into reliable plastic parts on predictable timelines. At InjectFast, you get 20+ years of practical experience across prototypes, low-volume runs, and high-volume production.
Our Injection Molding Capabilities
We run 30T to 2500T injection molding machines from FANUC, Nissei, and Arburg. This broad range lets us produce micro-precision components and large structural parts in the same facility.
You benefit from these processes:
- Precision injection molding with tight tolerances
- Large-part injection molding for oversized components
- Insert molding that securely embeds metal parts in one cycle
- Overmolding for multi-material designs and soft-touch surfaces
- Plastic gear and transmission component molding with accurate meshing performance
We achieve tolerances as tight as ±0.02 mm on critical features when material and design support it. Our CMM coordinate measuring systems and dedicated gear inspection equipment verify dimensions on every batch.
We start every project with DFM analysis. This review catches wall thickness variations, insufficient draft angles, poor gate locations, and other issues before we cut steel. Early DFM work reduces tooling changes and keeps your per-part costs under control.
Incoming material inspection
Mold validation testing
Functional and reliability testing
Our Injection Molding Materials
We help you select the right material for performance, cost, and manufacturability. Here are the most commonly requested options:
ABS
Strong, durable, and impact-resistant, ABS offers excellent heat resistance and is commonly used in automotive parts, consumer electronics, and household goods. Its toughness and versatility make it a popular choice for high-demand applications.
Color: Beige / Black / White
Subtypes: ABS Beige (Natural), ABS Black, ABS Black Antistatic, ABS Milky White, ABS+PC Black, Flame Retardant ABS Beige, Flame Retardant ABS Black.
Price: $$ Lead Time: About 5 business days
PC (Polycarbonate)
PC delivers outstanding impact strength and optical clarity. It performs well in demanding environments and is widely used for transparent covers, safety components, and electronic housings that require toughness and dimensional stability.
Color: Clear / Black / White
Subtypes: PC Clear, PC Black, PC White, Flame Retardant PC, PC+ABS Blend, Medical Grade PC.
Price: $$ Lead Time: About 5-7 business days
PA (Nylon)
PA offers high mechanical strength, excellent wear resistance, and good fatigue performance. It is ideal for gears, bearings, and structural components that experience repeated motion or load.
Color: Natural / Black / White
Subtypes: PA6, PA66, Glass-Filled PA, PA6 Black, Flame Retardant PA, Oil-Filled PA.
Price: $$ Lead Time: About 5-7 business days
POM (Acetal / Delrin)
POM provides excellent dimensional stability, low friction, and high stiffness. It is frequently chosen for precision gears, bushings, and mechanical parts that require tight tolerances and smooth operation.
Color: Natural (White) / Black
Subtypes: POM Natural, POM Black, Glass-Filled POM, POM+PTFE.
Price: $$ Lead Time: About 5 business days
PP (Polypropylene)
PP is lightweight, chemically resistant, and cost-effective. It performs well in applications that require fatigue resistance and is commonly used for packaging, automotive interiors, and medical disposables.
Color: Natural / Black / White
Subtypes: PP Homopolymer, PP Copolymer, Talc-Filled PP, Flame Retardant PP, Medical Grade PP.
Price: $ Lead Time: About 5 business days
PEEK
PEEK offers superior high-temperature performance, chemical resistance, and mechanical strength. It is the material of choice for extreme environments in medical, aerospace, and oil & gas applications.
Color: Natural (Beige) / Black
Subtypes: PEEK Natural, PEEK GF30 (Glass Filled), PEEK CF30 (Carbon Filled), Medical Grade PEEK.
Price: $$$ Lead Time: About 7-10 business days
We discuss real trade-offs with you. Glass-filled PA adds stiffness but increases tool wear. Our team flags these factors so you avoid over-specifying materials that inflate budget without delivering needed performance.
Surface Finishing and Secondary Operations
We apply finishes that match your appearance and functional needs. You can choose from SPI mirror polishes to textured surfaces. Additional services include spray painting, silk screening, laser engraving, hot stamping, ultrasonic welding, and final product assembly.
We keep these operations in-house. You avoid the coordination delays and quality variations that come with multiple suppliers.
Need help choosing the right finish? Our engineering team can help you select the optimal surface finish based on your specific application requirements, material properties, and budget constraints. Contact our engineers.
Custom Injection Molding for High-Quality Parts
With our modern Shenzhen-based facilities, equipped with 30 to 2500-ton injection presses, we manufacture parts of any size or complexity. Our services include precision mold design, overmolding, insert molding, and secondary finishing, all backed by expert engineering consultation. Partnering with InjectFast for your entire project—from design through production—reduces lead times, ensures consistent part quality, and provides the flexibility to scale efficiently while controlling costs.
Injection Molding
Get high-precision aluminum and steel molds tailored to your project. At Inject Fast, we provide mold flow analysis, tight tolerance control, and robust tooling designed for both prototype and mass production. Our engineering team ensures molds are optimized for efficiency, accuracy, and long-term reliability.
Key Highlights:
- High-precision molds for complex geometries
- Tolerance control down to 0.02 mm
- Free mold flow analysis and design consultation
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Overmolding
Overmolding at Inject Fast is a multi-step injection molding process that bonds plastic layers to create integrated, durable parts. This technique enhances product functionality and aesthetics, offering options for color, texture, and soft-touch finishes.
Key Highlights:
- Multi-material, multi-step molding
- Durable, functional, and visually appealing parts
- Supports color and texture customization
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Insert Molding
Insert molding combines pre-placed components such as metal or threaded inserts with plastic parts in a single molding process. Inject Fast eliminates the need for additional assembly, improving efficiency, part strength, and overall product consistency.
Key Highlights:
- Combines plastic parts with metal or threaded inserts
- Reduces assembly steps and fasteners
- Improves mechanical strength and product consistency
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Our Project Process
This structured flow reduces risk. You catch design or tooling issues early instead of during mass production.
Industries We Serve
We support manufacturers in automotive, medical devices, consumer electronics, home appliances, industrial automation, smart home systems, telecommunications, power tools, and plastic transmission components. Each industry has unique requirements for material certification, dimensional stability, or cosmetic standards. We apply the right controls without adding extra cost layers.
Advantages & Limitations of Injection Molding
| Advantages | Limitations |
|---|---|
| High production efficiency for large volumes | High upfront cost for mold design and fabrication |
| Consistent part quality and tight tolerances | Less economical for very low-volume production |
| Capable of producing complex geometries | Design changes after mold fabrication are costly |
| Wide range of thermoplastic and engineering materials | Long lead time for initial tooling |
| Excellent repeatability and surface finish | Limited to thermoplastics (some high-performance resins possible) |
| Suitable for both small and large parts | High energy and equipment cost for large molds |
| Supports secondary processes: overmolding, insert molding, decoration | Requires skilled engineering and design review |
Why Manufacturers Choose InjectFast
- 20+ years of focused injection molding experience
- 30T–2500T machine range for small to large parts
- In-house engineering team that improves designs before tooling
- No strict minimum order quantities
- Complete quality system with incoming, in-process, and final inspections
- Proven global delivery track record
We focus on predictable results that protect your timelines and budgets. We do not promise unrealistic speeds on every project. Instead, we deliver consistent quality that scales with your needs.
Frequently Asked Questions (FAQ)
Q1: What is custom injection molding and when should I use it?
A: Custom injection molding is a process where molten plastic is injected into a tailored mold to produce precise, repeatable parts. It is ideal for both complex geometries and high-volume production, especially when consistency and part quality are critical.
Q2: What materials can be used for injection molding?
A: We work with a wide range of thermoplastics and engineering plastics, including ABS, PC, PP, PA (Nylon), POM, TPE, and specialty resins. Material selection depends on part function, mechanical strength, and surface requirements.
Q3: What are the typical lead times for injection molded parts?
A: Prototype parts can be ready within 2–4 weeks depending on mold complexity. Mass production lead times depend on order volume and mold size, typically 4–8 weeks after mold approval.