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Verification Phase New

De-risk production with rigorous prototyping, testing, and manufacturability validation.

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Seamlessly scale validated prototypes into high-volume production with optimized processes and materials.

Packaging Phase New

Deliver your product safely and efficiently with professional, market-ready packaging solutions.

Service Packages New

Choose the ideal NPI package—from feasibility to mass production—to accelerate your go-to-market strategy.

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eBooks

Improve manufacturing know-how with our eBooks collection.

Case Studies

Learn successful stories to inspire your project.

Surface Finishes

Select from 30+ surface finishing options.

Materials

Choose from 50+ metals and plastics for your project.

CNC Machining eBook

If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining.

Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.

About RapidDirect

Our vision, mission, development history, and dedicated team.

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Building A12, Haosi Industrial Park
Nanpu Road, Xinqiao Street, Bao'an District
Shenzhen, China, 518104
+86 0755-85276703
+86 158 0208 7464
[email protected]

Custom Injection Molding Services

Name: Injection Molding Services
Brand: RapidDirect
Rating: 4.9 (270 reviews)

Get custom plastic prototypes and end-use production parts. Request for free injection molding quotes today. Receive expert DFM analysis.

ISO 9001:2015, ISO 13485, ISO14001:2015, IATF 16949:2016 certified
T1 sample as fast as 2 weeks
No minimums

Start a New Injection Molding Project!

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STEP | STP | STL | IGS | IGES | PRT | SLDPRT | SAT | X_T
Max. file size: ≤15MB

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20,000+ customers in over 120 countries & regions trust RapidDirect to manufacture their custom parts

Injection Molding Materials

We offer a broad range of thermoplastic and thermoset materials, each selected for its performance characteristics and suitability for different applications.

PLASTICS

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

Known for its exceptional strength and high impact resistance, polycarbonate also boasts excellent transparency. It’s used in safety-critical applications like bulletproof glass, eyewear lenses, and protective gear, where clarity and durability are key.

Color:	White Black
Subtypes:	Flame Retardant Transparent PC, Food Grade PC-Transparent, PC Black, PC Transparent, PC White, PC Yellowish White, PC+GF30 Black
Price:	$$
Lead Time:	About 5 business days

PMMA (Acrylic)

PMMA (Acrylic)

With its crystal-clear appearance and outstanding weather resistance, PMMA is ideal for outdoor displays, signage, and lighting. It’s more durable than glass and can withstand UV exposure without degrading over time.

Color:	Black White
Subtypes:	PMMA Black, PMMA Transparent, PMMA White
Price:	$
Lead Time:	About 5 business days

POM

POM is a high-performance plastic with excellent dimensional stability, low friction, and high strength. It's commonly used in precision mechanical components like gears, bearings, and other high-stress parts where accuracy is critical.

Color:	Black White Blue Dark brown
Subtypes:	Dark Brown (Coffee) POM 100AF, POM Black, POM Blue, POM White
Price:	$$
Lead Time:	About 5 business days

PA (Nylon)

PA (Nylon)

Known for its strength, flexibility, and wear resistance, nylon is used in a wide range of industrial applications, including gears, bearings, and automotive components. It also has good resistance to abrasion and friction.

Color:	Blue Black Beige
Subtypes:	PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black
Price:	$$
Lead Time:	About 5 business days

PE

Lightweight, tough, and resistant to impact, polyethylene is a versatile material used in packaging, containers, and piping. Its chemical resistance and durability make it ideal for outdoor and high-moisture environments.

Color:	Black White
Subtypes:	PE Black, PE White
Price:	$$
Lead Time:	About 5 business days

PEEK

PEEK

Renowned for its exceptional heat resistance, mechanical strength, and chemical resistance, PEEK is commonly used in aerospace, automotive, and medical implant applications, where high performance at extreme temperatures is required.

Color:	Beige Black
Subtypes:	PEEK Beige (Natural) and PEEK Black
Price:	$$$
Lead Time:	About 5 business days

PP

Tough, chemically resistant, and lightweight, polypropylene is widely used in automotive parts, packaging, and medical devices. Its resistance to chemicals and low moisture absorption makes it suitable for many industrial applications.

Color:	Black White
Subtypes:	PP Black, PP White, PP+GF30 Black
Price:	$
Lead Time:	About 5 business days

HDPE

HDPE

High-density polyethylene offers excellent strength-to-density ratio, impact resistance, and durability. It’s used in manufacturing bottles, corrosion-resistant piping, and plastic lumber due to its resilience in harsh environments.

Color:	Black White
Subtypes:	HDPE Black, HDPE White
Price:	$$
Lead Time:	About 5 business days

HIPS

HIPS

High-impact polystyrene is easy to process and machine, offering good impact resistance and dimensional stability. It's frequently used in prototyping, displays, and packaging due to its ease of molding and processing.

Color:	White
Subtypes:	HIPS Board White
Price:	$$
Lead Time:	About 5 business days

LDPE

LDPE

Soft, flexible, and with excellent sealing properties, LDPE is commonly used in plastic bags, tubing, and films. Its flexibility and ease of processing make it ideal for applications requiring heat sealing or stretchability.

Color:	White
Subtypes:	LDPE White
Price:	$$
Lead Time:	About 5 business days

PBT

PBT is a rigid, heat-resistant material known for its strength and dimensional stability. It's widely used in automotive, electrical, and electronics applications, including connectors and casings.

Color:	Black Milky White
Subtypes:	PBT Black, PBT Milky White（Natural）
Price:	$$
Lead Time:	About 5 business days

PET

Strong, chemical-resistant, and moisture-resistant, PET is used in a variety of applications, including food containers, beverage bottles, and textiles. Its high strength and recyclability make it a popular choice in packaging.

Color:	Black White
Subtypes:	PET Black, PET White, PET+GF30 Black, PET+GF30 White
Price:	$
Lead Time:	About 5 business days

PPS

PPS provides excellent chemical resistance and heat stability, making it ideal for use in automotive, aerospace, and industrial applications. It's used for components exposed to high temperatures and harsh chemicals.

Color:	Black White
Subtypes:	PPS Black, PPS White, PPS+GF30 Black, PPS+GF30 White
Price:	$$
Lead Time:	About 5 business days

PS

Lightweight and easy to machine, PS is often used for models, prototypes, and low-strength applications. Its ability to be easily molded makes it a preferred material in packaging and disposable items.

Color:	Transparent
Subtypes:	PS Transparent
Price:	$$
Lead Time:	About 5 business days

PVC

PVC is a versatile, cost-effective material with good chemical resistance and durability. It's widely used in plumbing, medical devices, electrical cables, and construction materials due to its strength and versatility.

Color:	Grey
Subtypes:	PVC Grey
Price:	$$
Lead Time:	About 5 business days

PTFE (Teflon)

PTFE (Teflon)

Known for its excellent chemical resistance and low friction properties, PTFE is commonly used in non-stick coatings, gaskets, seals, and bearings. It performs well in extreme environments, with high temperatures and aggressive chemicals.

Color:	Black White
Subtypes:	Teflon (PTFE) Black, Teflon (PTFE) White
Price:	$
Lead Time:	About 5 business days

UPE

UPE is a tough, durable material with outstanding abrasion resistance. It's typically used in high-wear applications such as lining chutes, hoppers, and conveyor systems where impact resistance is crucial.

Color:	Black White
Subtypes:	UPE Black, UPE White
Price:	$$
Lead Time:	About 5 business days

Get a tailored material assessment！

Injection Mold Surface Finishes

We offer SPI surface finishes for your injection molds. Our injection molding expert is here to help you choose the right finish for your project. Upload your design on our quoting platform today and receive a detailed quote within 24 hours.

SPI A

Premium

Mirror finish with exceptional smoothness and reflectivity. Ideal for high-end consumer products, optical components, and applications requiring pristine surface quality.

Technical Specifications

Finishing Look	High Gloss
SPI Finish Grades	SPI A1, A2, A3
Surface Roughness Ra (μm)	SPIA1: 0.012 to 0.025 SPIA2: 0.012 to 0.025 SPIA3: 0.05 to 0.10

SPI B

High Quality

High gloss finish with excellent surface quality and minimal visible tool marks. Perfect for automotive parts, electronics housings, and premium consumer goods.

Technical Specifications

Finishing Look	Semi Gloss
SPI Finish Grades	SPI B1, B2, B3
Surface Roughness Ra (μm)	SPI B1: 0.05 to 0.10  SPI B2: 0.10 to 0.15  SPI B3: 0.28 to 0.32

SPI C

Premium

Semi-gloss finish with good surface quality and moderate tool marks. Suitable for general purpose applications, household items, and cost-effective production runs.

Technical Specifications

Finishing Look	Low Gloss
SPI Finish Grades	SPI C1, C2, C3
Surface Roughness Ra (μm)	SPI C1: 0.35 to 0.40  SPI C2: 0.45 to 0.55  SPI C3: 0.63 to 0.70

SPI D

High Quality

Matte finish with visible tool marks and textured appearance. Ideal for industrial applications, prototypes, and products where surface finish is not critical.

Technical Specifications

Finishing Look	Matte
SPI Finish Grades	SPI D1, D2, D3
Surface Roughness Ra (μm)	SPI D1: 0.80 to 1.00 SPI D2: 1.00 to 2.80   SPI D3: 3.20 to 18.0

*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.

Plastic Injection Molding Services for
Custom Parts

RapidDirect makes it easy to move from on-demand prototypes to production molding for high-quality, cost-effective plastic parts in days. With access to our trusted supplier network and China-based facilities equipped with 90 to 830-ton presses, we can produce parts of any size or complexity. Our capabilities include precision mold tooling, overmolding, and insert molding, all supported by expert engineering consultation. Working with a single partner from design to production speeds up lead times, improves part consistency, and gives you the flexibility to scale quickly while keeping costs under control.

Injection Mold Tooling

Get high-quality aluminum and steel injection molds customized to your needs. We achieve tight tolerances of 0.0008 in (0.02 mm) and offer free mold flow analysis. Ideal for mass production.

Learn More

Overmolding

Overmolding is a multi-step injection molding process that bonds plastic to another component (substrate), creating an integrated, durable product. Offers color and texture options.

Learn More

Insert Molding

A subset of injection molding techniques where combines engineering plastics with pre-placed inserts in the mold cavity. It eliminates the need for fasteners.

Learn More

How Does RapidDirect Injection Molding Process Work

At RapidDirect, we make custom injection molding services simple and efficient. From online quotes to high-quality plastic injection molding and production-ready injection molded parts, our process ensures precision, speed, and reliability.

/01 Upload Design File

Start by uploading your 3D CAD files and 2D drawings to RapidDirect's online manufacturing platform, setting the stage for precise custom molding.

/02 Get Quote with DFM

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

/03 Review T1 Sample

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

/04 Production Begins

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

/05 Delivery

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

/06 Ready to Start

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

Streamlied injection molding process?

Let’s Get Started

Injection Molding Manufacturing Network

RapidDirect’s 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. Streamline every order with clear communication and expert guidence to keep production on schedule and meet your specifications.

50+

Machines Set

20,000+

Customers Worldwide

120+

Countries & Regions Served

Injection Molding Factory in China

Injection Molding Machine

Injection Mold

Injection Molding Factory

Injection Molds

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.

Standards	Description
Maximum Part Size	1200×1000×500 mm
Manimum Part Size	5×5×5 mm
Part to Part Repeatability	+/- 0.1 mm
Mold Cavities	Single-cavity molds, multi-cavity molds, family molds
Available Mold Types	Steel and aluminum molds. Production levels below 1000, 5000, 30000, and over 100000 uses
Mold Cavity Tolerances	+/- 0.02 mm
Secondary Operations	Mold texturing, pad printing, laser engraving, threaded inserts, and basic assembly
Undercuts	Y-type, L-type undercuts
Wall Thickness	0.5 mm to 5 mm
Draft	0.5° to 2°
Ribs/Gussets	0.5 mm to 3 mm thick
Bosses	Diameter 3 mm to 10 mm
Lead Time	Most orders can be completed within 15 working days

Looking for custom solutions? Our engineering team supports your exact needs to deliver optimal results and reliable part performance.

RapidDirect
Injection Molding Solutions

Get custom plastic prototypes and production parts with flexible solutions from RapidDirect.

Rapid Prototyping

Address critical time-to-market needs by providing flexibility and economic efficiency for iterative development before full-scale production.

Utilize aluminum or steel molds, which are perfect for rigorous testing and iterative processes.
Typically single cavity, allowing for precise control during the prototype phase.
Efficiently produce anything from a single unit to small batches (up to 2,000 units), facilitating quick market testing and design validation.

High-Volume Production

Support large-scale manufacturing demands, effectively overcoming common production challenges and offering on-demand production capabilities.

Durable steel molds designed for high repeatability across extensive production runs.
Available in single or multi-cavity configurations to optimize productivity and cost-efficiency.
Ability to scale production seamlessly to meet large order demands, ensuring consistent quality and timely delivery.

Injection Molding
for Various Industries

From automotive to electronics, RapidDirect’s injection molding services deliver reliable, cost-effective solutions to fit the custom demands of each industry.

Aerospace

Automotive

Automation

Electronics

Robotics

Consumer Products

Injection Molding for Prototyping to Producton

Move from prototypes to full production with speed. RapidDirect manages each step of injection molding within your product development process.

Injection Molding
Timeline

Looking to optimize your injection molding process? Grab our comprehensive timeline Gantt chart to monitor your project’s progress, ensuring adherence to budget and specifications.

Why
Choose Us

/01

High Quality Parts

Our ISO-certified factories do in-process checks and post-production tests to make sure every custom molded part is precise and consistent, no matter how complex.

/02

Fast Lead Time

We use certified local factories and a strong supply chain to speed up product development, delivering plastic parts in as little as 2 weeks.

/03

Engineering Support

Talk to our experts with 10+ years of experience in injection molding for help with mold design, material selection, and finishes—making the whole process smoother.

Ready to get started?

Ultimate Guide to Injection Molding

Injection Molding Quality Control

We value quality from design to production. Cross-team reviews and strict controls help achieve a 90% first-pass yield for all plastic molded parts.

Mold and Pre-produdction Inspection

Proper mold design and pre-production checks are key to injection molding quality. Engineers consider part geometry, material flow, and cooling systems to guarantee smooth production. Trial molds are tested to confirm all functions work correctly, providing stable and consistent results.

In Process Quality Control

Continuous checks during production keep custom molded parts consistent. Injection machine parameters such as speed, pressure, and temperature are monitored within set limits. Regular inspections of part dimensions and appearance help detect and fix issues quickly.

Final Inspection

Completed parts undergo thorough final inspection to meet design and quality standards. Teams check dimensions, appearance, and physical properties. Precision instruments like coordinate measuring machines (CMM) and colorimeters verify that all components meet strict standards.

Learn more

Applications of Injection Molding

Injection 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.

Gears: High-tolerance, durable gears for mechanical and electronic devices.
Housings: Strong housings for electronics, automotive parts, and industrial machines.
Enclosures: Precise enclosures for electronics, protecting internal components.
Handles: Ergonomic, durable handles for tools, appliances, and products.
Caps and Closures: Efficient caps and closures for bottles, ensuring tight seals.
Connectors: Small, intricate connectors for electrical and electronic needs.

Advantages of Injection Molding

High-volume, consistent production
Low cost per unit after setup
Works with many materials (plastics, LSR)
High precision for complex designs

Disadvantages of Injection Molding

High upfront tooling costs
Longer lead times
Design limitations
Not cost-effective for low-volume runs

FAQs

What’s injection molding?

Injection molding is a manufacturing process used to produce parts by injecting molten material into a mold. It is commonly used with plastics but can also accommodate metals, glasses, and elastomers. The process begins with melting the material, which is then injected under pressure into a mold cavity. Once the material cools and solidifies, the mold is opened to eject the finished part. This technique is favored for its ability to produce large volumes of identical parts with high precision, complex shapes, and excellent surface finish. Injection molding is efficient and cost-effective, particularly suitable for mass production.

What are 4 stages of injection molding?

Injection molding is a complex process that involves four key stages to create high-quality plastic parts:

Clamping: Before the injection of the material, the two halves of the mold must be securely clamped together by the injection molding machine. This is crucial to prevent the mold from opening during injection, ensuring that the molten plastic does not escape.

Injection: Molten plastic is injected into the clamped mold at high pressure. This stage involves packing the plastic into the mold and maintaining pressure to fill every part of the mold cavity completely.

Cooling: After the mold is filled, the plastic begins to cool and solidify within the mold’s cavities. The cooling must be controlled to prevent defects and ensure that the part maintains proper dimensions and mechanical properties.

Ejection: Once the part has cooled and solidified, the mold opens and an ejection mechanism pushes the completed part out of the mold. The machine is then ready to start a new cycle with the clamping of the mold for the next part.

What’s the process for injection mold making?

Our injection mold-making process includes six essential steps:

Step 1: Production Arrangement: We begin by thoroughly understanding all requirements and arranging the production details accordingly.

Step 2: DFM Report Analysis: A detailed Design for Manufacturability (DFM) report is provided free of charge. This report helps in conducting a feasibility analysis to ensure the mold will meet all specifications and quality standards.

Step 3: Production of the Mold: The mold is put into production. We provide clients with a Tooling Schedule form that outlines the entire cycle, allowing them to track the progress at any time.

Step 4: Free Sample Testing: Once the mold is produced, a sample is created and provided to the client for testing to ensure it meets the required specifications.

Step 5: Mass Production: Upon client confirmation that the sample meets all quality and functionality criteria, full-scale production commences.

Step 6: Mold Saving: After production and a thorough quality inspection, the parts are delivered. The mold is then cleaned and properly stored to maintain its condition for future production runs.

What are the typical tolerances for injection molded parts?

In injection molding, maintaining precise tolerances is essential to ensure that parts fit correctly and function as intended, avoiding potential assembly issues. At RapidDirect, we strictly adhere to the ISO 2768-c standard for general tolerances, which is commonly used across the industry for molded parts. This standard provides a range of tolerances for different features and dimensions, ensuring consistency and reliability in production. For projects requiring even stricter tolerances, we have the capability to accommodate tighter specifications, based on the unique requirements of each client’s application. This flexibility allows us to deliver precisely engineered parts that meet or exceed all expectations.

What is the minimum order qty?

At RapidDirect, we understand the diverse needs of our clients, which is why we have no minimum order requirement for our injection molding services. This flexibility allows businesses of all sizes to access high-quality molded parts, regardless of the size of their project. While we are equipped to handle orders from a single prototype to thousands of units, it’s worth noting that larger order quantities typically result in more competitive pricing. This volume discount is due to the economies of scale in production, making larger orders more cost-effective per unit. Whether your project is large or small, we are here to provide the best value and service.

How much does your injection molding service cost?

The cost of our injection molding services varies depending on multiple factors, including the size of the component, mold complexity, number of cavities, material type, and any specific post-processing requirements. Each project is unique, and we provide personalized quotes to ensure that you receive a detailed cost assessment tailored to your specific needs. This transparent pricing approach allows you to understand the financial implications before committing to the process. To get an accurate estimate, simply upload your project details on our platform, and we will analyze these factors to provide you with a comprehensive quote.

Can I get prototype parts before full-scale production?

Absolutely, RapidDirect strongly supports the development process by offering rapid prototyping services. This crucial step allows you to test and verify your designs effectively before moving into large-scale production. Prototyping is essential to identify potential issues and ensure that the design meets all functional and aesthetic requirements. By taking advantage of our prototyping services, you can make necessary adjustments early in the development cycle, saving time and costs in later stages. This approach not only enhances product quality but also ensures that the transition to full-scale production is smooth and efficient.