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Injection Molding

LC Rapid is an expert of best injection molding companies in advanced technology when it comes to plastic injection mold manufacturing. With advanced technology, high quality plastic material, good quality control process, decades of manufacturing experience and a team of experienced project managers, we can ensure exceptional quality tools and parts that exceed your expectations being delivered on time. We can produce 25 to 100,000+ parts. We embrace advanced technology and cost reduction measure to guarantee our competitiveness in the global market. Just upload your product design and request information to complete your project.

Injection Mold Manufacturing Services

Plastic injection mold machining is a manufacturing process that requires an injection molding machine, raw plastic resin, injection mold tools. 

The precision plastic injection molding process consists of the following key steps.

  • Step 1: The plastic resin begins as raw plastic pellets. These have been treated by drying, and then if necessary dyeing with pigments or master batch colorants.

  • Step 2: The pallets are fed into the machine through a funnel-shaped hopper. A reciprocating screw inside the barrel of the machine will inject these resins into the mold’s runner system.

  • Step 3: Resin pallets are loaded into a heated and compressed chamber called the barrel where they will be melted, forming the liquid resin. 

  • Step 4: The melted resin enters into the mold cavity through a nozzle under high pressure.

  • Step 5: After the mold’s cooling and solidification, the part has been demoulded to the shape of the mold cavity.

  • Step 6: The mold halves (cavity or “A” side and core or “B” side) open up and a cycle begins again for the next part.

Advantages of Precision Plastic Injection Molding

Good Finishes Good Finishes

Precision Injection Molding delivers superior appearance, quality, and surface finish when compared with many other manufacturing processes.

Cost Efficient Cost Efficient

The price-per-piece is significantly lower when compared with other processes. The final cost correlates with product quantity – greater quantities mean overall price decreases.

Time Efficient Time Efficient

We offer full lines of manufacturing and finishing services to make tools, allowing us to deliver superior quality molded parts within 10 days.

Wide Range of Material Selection Wide Range of Material Selection

Choose from near-limitless plastic materials, Injection Molding produces high production runs of parts from a wide array of certified materials.

Scalability Scalability

Plastic Injection Molding is the perfect process for custom production 25-100,000 parts.

High Tolerances High Tolerances

Injection Molding is a highly automated production process that produce hundreds of thousands of finished identical parts with very details and accuracy dimension.

Injection Molding Process

  • Insert Molding

Insert molding is a great injection molding process that combine metal and plastics into one single part. It allows inserts such as helicoils, screws, metal filters to go inside your mold.

  • Overmolding

The overmolding is a multi-material injection molding process that allows clients to get the final item that involves two or more different types of material.

  • Mold Making

We offer design and manufacturing services for mold, dies, and tools to produce high quality plastic parts. Clients owe the tools.

  • Thermoplastic Injection Molding

LC Rapid produce custom injection molded items from hard toolings for low volume plastic molding and large runs of production.

Injection Molding Process

Precision Plastic Injection Molding Tolerance

The tolerance depends on the injection plastic, tooling structure, and the design geometry, injection molding part tolerance need to be discussed every project, we will attempt to meet your tolerance standard. 

Injection Molding Tolerance

Precision Plastic Injection Molding Materials

Acrylonitrile Butadiene StyreneABS
Polycarbonate-Acrylonitrile Butadiene StyrenePC-ABS
Polyvinyl Chloride (Shore D)PVC
PolyamideNylon (PA)
Polymethyl MethacrylateAcrylic (PMMA)

Precision Plastic Injection Molding Finishes

Surface FinishGuideTypical Applications
SPI A-1Grade #3 diamond buffHigh polish parts, optically clear.
SPI A-2Grade #6 diamond buffHigh polish parts.
SPI A-3Grade #15 diamond buffHigh polish parts.
SPI B-1600 Grit Paper.Medium polish parts.
SPI B-2400 Grit Paper.Medium polish parts.
SPI B-3320 Grit PaperMedium- Low polish parts.
SPI C-1600 Stone.Low polish parts.
SPI C-2400 Stone.Low polish parts.
SPI C-3320 Stone.Low polish parts.
SPI D-1Dry Blast Glass BeadSatin Finish.
SPI D-2Dry Blast #240 Aluminum OxideDull Finish.
SPI D-3Dry Blast #24 Aluminum OxideDull Finish.
Standard No Machine MarkRemove tooling marksLow Cosmetic
Mold Texturing
We can match a wide varieties of mold textures upon request.

Injection Molding Material
Injection Molding Solutions

Injection molding builds durable, dimensional accurate, super performance parts with engineering thermoplastic materials to help ensure high quality automotive parts like automotive trim components, automotive bumper bars, vent pipe, automobile lens.


Injection molding makes the enclosures for electronics and electronic assemblies such as integrated circuit housings, capacitor housings, transformer housings, timer housings quickly and affordable.


With many different grades of plastic, plastic injection molding is one of the best solutions for producing medium to high volumes of production parts for medical carts, surgical tools, and portable devices.

Common Applications of Injection Molding

End-use Production

Injection molding is the most commonly used manufacturing processes used to create end-use production plastic parts as the tool can produce thousands of high quality parts per day. Injection molding is well known for producing products as a mass scale with speed, quality consistency and low price-per-piece.

Rapid Prototyping

Injection molding is ideal for rapid moulding prototyping because the molded parts can be produced efficiently and cost effectively to test and validate a concept model. Generally speaking, the molded parts of rapid injection molding prototyping have more toughness and greater impact resistance than 3D printed parts.

Featured Injection Molding Resources

Do you offer multi-cavity tools?

We are able to make multi-cavity tools for injection molding to reduce the tooling cost and production costs. 

Can I modify the injection mold after the first run?

Whether your injection mold needs additional machining, welding, or replacement of hoses and small parts, we can modify for your at a reasonable cost. However, it is more cost-saving to produce a new mold than modifying the existing one if the changes are a lot.

How to select resigns for injection molding?

Customs should take the performance of various resin types and grades into consideration, which including tensile strength, impact strength, mechanical characteristics, molding properties, and cost of the resin.

What materials do you use for the molds?

We use aluminum and steel material to fabricate the molds. LC Rapid specializes in low-cost, rapid turnaround tooling for around 50,000 cycles. Toolings for around 50,000 cycles is advantageous especially for prototyping and low-volume production products where low-cost is significant. 

Injection Molding Video
Injection Molding Technical Support
Ready to Get A Quote for Your Injection Molding Projects?
Working with clients from different industries on a global basis, we have developed all-around solutions for producing tooling and molded parts rapidly and full post-processing services to ensure your versatile needs met.
Contact us now to request started today
YinCheng Road, XiaBian Community, ChangAn Town, DongGuan City, GuangDong Province, China.
sales@lcrapid.com +86-18898486814