Home / Manufacturing Services / Injection Molding Service

Injection Molding Service

First Mold is a leader in the injection molding services industry. With over 10 years of manufacturing experience, we help reduce mold making and molding costs during production. Our professional mold design, precision machining capabilities, advanced equipment, and fast turnaround ensure that First Mold can do things better than others.

If needed, we can sign an NDA agreement before providing the quotation.

What Is Injection Molding？

Injection molding is a versatile manufacturing process where molten material (such as engineering-grade plastics, liquid silicone rubber (LSR), or multi-material composites) is injected into a precision-designed mold cavity. After cooling and solidification, the material takes the shape of the mold to achieve high-volume production of custom parts with consistent quality.

As a global injection molding service provider, First Mold operates dual manufacturing hubs in China and Mexico. We deliver end-to-end solutions from prototyping to mass production for startups, product design firms, prototype developers, and large enterprises.

If you are completely new to the injection molding industry, click ‘What is Injection Molding?‘ to learn more about the basics.

Types of Injection Molding Technologies We Offer

While many associate injection molding solely with plastic parts, the technology encompasses a wide range of specialized processes such as plastic injection molding, metal injection molding, LSR, etc. At First Mold, we provide 5 types of injection molding services as below:

Plastic Injection Molding

The standard method for high-volume production of durable consumer goods, automotive components, and housings using polymers like ABS, PC, or nylon.

Two-Color Injection Molding

Combines two materials in a single cycle for multicolored consumer products, wear-resistant gears, and waterproof industrial parts.

Insert Molding

Embeds metal or ceramic inserts into plastic parts, used in electrical connectors, threaded fasteners, and sensor housings.

Overmolding

Bonds a soft material (e.g., TPE) over a rigid substrate, ideal for ergonomic tool grips, medical device buttons, and vibration-resistant seals.

Silicone Injection Molding

Utilizes LSR for high-temperature medical devices, baby bottle nipples, and flexible automotive gaskets.

Injection Molding Services in Mexico for the North American Market

Over the past decade, we’ve delivered cost-effective injection molding solutions to 200+ North American clients, from automotive tier-1 suppliers to medical device innovators. With our new Mexico-based manufacturing hub in Silao, we now offer USMCA-compliant production and tariff-free exports to the U.S. and Canada. Whether you need rapid tooling for prototypes or high-volume production molds, our North America-focused team ensures 30% faster delivery than traditional offshore suppliers.

Compared to China facilities, our Mexico plant eliminates 2 critical risks for clients:

Delivery Speed 95%

Cost Efficiency 96%

Rapid Tooling Efficiency 100%

Production Flexibility 98%

Surface Finishing 95%

Automotive Parts Production 100%

Quality Control 97%

Craft Perfection with a Click

Custom Injection Molding Workflow

Custom injection molding involves complex processes, but all you need to do is upload your 3D drawings to First Mold’s online injection molding platform.

Step One

Project Submission & Quote Review

Submit your design files (3D CAD, STEP, or IGES) through our online portal, and our team will analyze your injection molding service requirements within 24 hours.

Step Two

Design for Manufacturing (DFM) Analysis

We perform a custom DFM review to optimize part geometry, material selection, and mold design, ensuring cost-effective production for both prototype and mass volumes.

Step Three

Design Approval & Order Confirmation

Finalize part specifications (tolerances, surface finish) and approve the injection mold design before issuing a formal production order.

Step Four

Precision Mold Manufacturing

CNC machining and EDM processes create high-durability steel or aluminum molds, validated through trial runs for consistent part quality.

Step Five

Quality Control & Adjustments

Every batch undergoes dimensional inspection (CMM) and material testing, with real-time adjustments to meet medical-grade or automotive standards if required.

Step Six

Delivery & Post-Production Support

Parts are assembled, surface-treated (texturing/painting), and shipped globally from our China or Mexico facilities, with optional tool maintenance and warehousing services.

Our end-to-end injection molding solutions include:

Tool Maintenance
Tool Repair
Molding Process
Surface Finishing
Texturing
Post Processing
Mold Assembly
Packaging
Warehousing

Why Choose Us As Your Parts Making Supplier

Extensive Experience

Advanced Equipment

Use Of Advanced Quality Control

In-house Tooling Capabilities

45,000,000 +

Monthly Parts Production

50 +

Monthly Molds Fabrication

0.005 mm

Mold Tolerance

90-1000 T

Injection Molding Tolerance

Items	Description	Items	Description
Maximum Part Dimensions:	1600mm x 1400mm x 500mm	Minimum Part Dimensions:	1mm x 1mm x 5mm
Range of Materials Used:	Over 200 types, including modified plastic materials	Injection Mold Lead Time:	The fastest delivery time is one week
Injection Molding Cycle:	20 seconds for ordinary structural parts	Tooling and injection molding department:	More than 130 employees in their respective roles

Applications In Different Industries

From lightweight automotive components to life-saving medical devices, Injection molding technology is applied in the automotive, aerospace, home appliance, consumer, medical, electronics, robotics industries, etc. As a reliable injection molding suppliers, Firstmold’s services are primarily used in the following sectors:

Automotive

Engineered for dashboards, ECU housings, fluid reservoirs, and under-hood components, etc.

Aerospace

High-strength, flame-retardant components like cockpit controls, drone housings, and radar covers

Medical

ISO 13485-certified production of surgical tools, IV connectors, implant casings, and drug delivery parts.

Tools & Equipment

Overmolded power tool grips, pneumatic valve bodies, and CNC machine guards resistant to oils, impacts, and repetitive stress.

Consumer Electronics

Manufacture precision, durable electronic parts with advanced electrical properties.

Personal Care

Ergonomic packaging for cosmetics, toothbrush handles, waterproof razor bodies, etc.

Injection Molding Cases

Mass Production of Small Button Featured Image

Mass Production of Small Button Parts

Injection Molding of VR Headset Front Cover

Silicone Injection Molded Baby Mask

insepection equipment housing manufacturing featured image

Inspection Equipment Housing Manufacturing By Insert Molding

Production Of Automotive Armrest Bases Through The Injection Molding

VR remote controller housing manufacturing featured image

Custom Plastic Molding For VR Remotes Controller Housing Manufacturing

Table Connector Production Featured Image

Insert Molding Process For Small Batch Of Table Connectors Production

Aircraft remote controller body insert molding

Aircraft Remote Controller Component Production By Insert Molding

PC material transformer junction box and cover

Injection Molding Mass Production Of Transformer Junction Boxes And Covers

Injection Molded Vehicle Airbag Production With TP and SI materials

Injection Molding Materials

There are over 200 common injection molding materials. It includes general-purpose plastics, engineering plastics, and high-performance materials.

Modified materials are optimized from base materials by adding fibers, flame retardants, or adjusting molecular structures. Globally, there are over 18,000 commercial modified materials to meet performance requirements in different scenarios.

Injection Molding Material Selection Principles for Product Designers

Select material properties based on functional needs: High-temperature resistance(PC, PEEK), Impact resistance(ABS), Transparency(PC, PMMA), Lightweight(PP)
Consider processing parameters such as fluidity and shrinkage rate to ensure molding precision.
Prioritize cost-effective and recyclable materials. For regulated industries (e.g., medical, food), use certified food-grade or biodegradable materials.

PEEK
PEI
PBT
POM
PMMA
TPU
TPE

Custom Surface Finishing for Injection Molded Parts

Beyond functional performance, the right surface finish elevates your product’s aesthetics and durability. At First Mold, we combine in-house standard finishing techniques with a 15+ year network of specialized suppliers to deliver textures, colors, and coatings that align with your brand vision. Whether your parts are molded in China or our Mexico facility, you won’t be disappointed.

In-House Surface Finishing Solutions

Standard Finish (SPI Class A/B)

Decorating Techniques

Partner-Enhanced Specialty Finishes

Functional Coatings

Aesthetic Treatments

Injection Molding vs 3D Printing vs CNC Machining: How to Choose?

Injection molding, 3D printing, and CNC machining are common processes for producing plastic products, and there are certain principles for selecting the right service provider for each process.

3 Key Scenarios for Choosing Injection Molding:

Mass Production Demand

When the order exceeds 500 pieces, the per-unit cost of injection molding may be only 1/10 of 3D printing, and the delivery speed improves with larger batch sizes.

Material Performance Requirements

High-temperature resistance (>120°C) or elastomeric properties (such as silicone seals)

Brand Consistency

The appearance textures (leather grain/matte) and color matching at the mass production stage can only achieve 99% consistency through injection molding molds.

Factor	Injection Molding	3D Printing	CNC Machining
Optimal Batch	1,000+ pieces (steel molds)	1-100 pieces (prototypes/small batches)	1-500 pieces
Per-Unit Cost	Cheap	Medium	Expensive
Material Selection	200+ engineering plastics/elastomers (ABS, PC, LSR, etc.)	Limited (mainly PLA, resin)	Limited plastics
Lead Time	Mold making: 7-30 days; Mass production: 1-3 days per 10,000 pieces	No mold required, 1-5 days delivery	No mold required, 3-10 days
Precision	±0.1mm, VDI 3400 texture	±0.3mm, layer marks require post-processing	±0.05mm, mirror polishing
Sustainability	High (recyclable materials, waste rate <5%)	Low (resin not recyclable, support material waste 30%+)	Medium

Injection Molding FAQ

How can you choose a proper injection molding service provider?

When choosing a suitable injection molding service provider, you need to consider many aspects all together.

First of all, look at the production capacity and equipment. Check if the specifications of the injection molding machines can meet the needs for the size and precision of your products. Also, see if the number of the machines and how automated they are can make sure that your orders will be delivered on time and the production can be done efficiently.

Secondly, pay much attention to the quality control system. For example, find out whether they have certifications like ISO 9001 or not, and check if their testing equipment and processes are all in good order.

Thirdly, think about the material supply and management. Make sure that they can provide the plastic materials you need, and that these materials are of good quality and are stored properly.

Besides, when it comes to the technical ability and experience, it's better to choose those who have experience in this industry and are really good at designing and making molds.

The service and response ability can't be overlooked either. The communication should be smooth and efficient, and there should be a guarantee for after-sales service.

Finally, balance the price and cost. Ask for clear quotations and choose the one that offers good value for money by taking into account product quality, production efficiency and other things. Only in this way can you pick out an injection molding service provider that suits your needs.

How can I tell if my design is suitable for the injection molding solution?

To figure out whether a design fits the injection molding solution, you need to think about these aspects: the product structure, the choice of materials and the product's performance, as well as the possibility of making the molds.

When it comes to the product structure, you should pay attention to whether the thickness of the walls is even. Try your best to make the differences in wall thickness as small as possible, so that you can avoid problems like uneven cooling and the product getting deformed. Design proper angles for taking the product out of the mold easily. Plan the strengthening ribs in a reasonable way to make the product stronger and prevent those ugly marks caused by shrinkage. And be careful when you design holes and grooves, and think about how their sizes and shapes will affect the injection molding process.

As for the choice of materials and the product's performance, you need to consider if the materials can flow smoothly to fill up the space inside the mold. You should pick materials that match the functions your product needs. At the same time, you also have to take into account what the product should look like and the features of the materials.

In terms of whether it's possible to make the molds, you must avoid designing structures that will make the molds too complicated. Otherwise, it'll cost a lot of money and be really hard to make them. Also, make sure that all the details in your design can be made with the tools and skills we have for making molds.

Does the injection molding service support small-batch production?

Of course it does. In terms of equipment and molds, First Mold has injection molding machines of different specifications. The small-sized injection molding machines are easy to install and debug, which is beneficial for small-batch production of small plastic products. And First Mold can use rapid molds to reduce costs.

On the aspect of cost and benefit, we will adjust the way of calculating costs for small-batch production. We will make reasonable pricing by taking into account raw material procurement, processing fees and so on. Meanwhile, in line with the personalized needs of the market, we will meet the needs of customer groups such as innovative enterprises and niche brands through small-batch production to gain benefits.

From the perspective of product design, how can we reduce the cost of future injection molding?

To cut down the cost of injection molding from the aspect of product design, there are three main points. Firstly, we need to optimize the product structure. That means keeping the wall thickness even and controlling the difference in wall thickness within 25% to shorten the injection molding cycle. Also, we should design the strengthening ribs reasonably. The thickness of the strengthening ribs should not exceed 60% - 70% of the wall thickness. In this way, we can enhance the product's strength while avoiding quality problems. Besides, we should design proper draft angles. The draft angle on the outer surface should be at least 0.5° - 1°, and that on the inner surface should be 1° - 2°. This can reduce the demolding time and prevent the product from being damaged.

Secondly, we need to optimize the choice of materials. We should select suitable materials according to the functions of the product to avoid wasting materials. Moreover, we have to consider the processability of the materials and choose materials with good fluidity to reduce energy and time costs.

Thirdly, we should integrate and simplify the design of parts. We can reduce the number of parts by integrating several parts into one whole for injection molding. And we should simplify the appearance design, avoid complex shapes and decorations on the outside. By doing so, we can lower the cost of molds and the difficulty of injection molding.

Can different colors of the same material be used in the same order?

We are pleased to offer comprehensive injection molding solutions designed to unlock innovative design potential while delivering tailored customization. To ensure optimal quality in multi-color applications, our process includes a nominal administrative fee for material transition procedures. This standard operational measure effectively prevents cross-contamination and maintains batch-to-batch uniformity, safeguarding your product integrity

Our precision-driven injection molding services elevate both visual impact and functional performance through advanced color integration technologies. Whether creating custom color gradients for consumer electronics or implementing medical-grade differentiation protocols, we empower your creative team to achieve:

Brand-aligned chromatic harmonization with precisely matched hues
Contrast optimization for enhanced user experience and compliance visibility