Plastic Injection Molding Service

Custom injection molding services for prototypes and parts production, get rapid injection molding quotes today!

  • No minimum order quantities
  • ISO 9001:2015 certificated
  • 24/7 engineering support

Save 30% budget in average

RD dot decor

What Makes RapidDirect Ideal for Plastic Injection Molding

strong capabilities

Strong Capability

Our experienced prototype injection molding services provide full list of injection molding processes, along with 100+ materials and surface finishes to suit your custom injection molding needs.


High efficiency

As an injection molding manufacturer in China, we provide affordable injection molding quotes within 1 business day. In addition, no MOQ rapid injection molding makes it feasible for initial development.

assured high quality

Reliable quality

Quick turn Injection molding with RapidDirect is at ease. We provide free DFM feedback, certifications and production update through the process. You always get high quality custom molded plastic parts.

RD image decor

Plastic Injection Molding Capabilities

image decor
rapid tooling

Rapid tooling

Fast and cost-effective process to create aluminum or steel injection molds for quick turn injection molding. Ideal for rapid prototyping needs or validating product concept for production.


Overmolding is a unique injection molding process that combines two or more components together. It is the best practice for the plastic manufacturing of multi-color and multi-layers products.

image decor
image decor
insert molding

Insert molding

Insert molding is a custom injection molding process that encapsulates components in a plastic part. It is most commonly used for prototype injection molding designs with threads and holes.

Liquid Silicone Rubber injection molding

Liquid silicone rubber (LSR) is a flexible prototype injection molding process that produces elastic, durable parts. Get custom prototypes and production parts from 15 days.

image decor
silicone rubber mold

Preferred Online Prototyping and Manufacturing Services

RD client

Hunt Dabney

The 4 parts look great and work very well. This order was to solve a problem on some equipment, so only the 4 parts were needed.

We were very pleased with your quality, cost and delivery, and will certainly order from you in the future. I have also recommended you to friends who own other companies.

- Owner at HDA Technology
RD client

Bjorn Steinar Blumenstein

The service at RapidDirect is phenomenal and Cherry has assisted us with great patience and understanding.

Great service as well as the product itself, exactly what we asked for and works amazingly. Especially considering the small details we were requesting. Good looking produckt.

- Product Designer at Plasplan
RD client

Rayner Moss

The motor tube was great, within tolerances and the finish was very nice. It was packaged very well and even though the box was clearly thrown around in transit, the contents were perfect.

The next time I need something machined I will definitely be coming to you.

- Individual Engineer
RD client

Drew Mumaw

Excellent job by production being able to use grips for the anodizing bath instead of a hole in the center of the part.

Always quick and easy dealing with Tammy – great communication! We look forward to doing business with RapidDirect soon.

- Mechanical Engineer

Plastic Injection Molding Materials

Plastic injection parts have the most variable options for materials, colors, and configurations. Here are the materials RapidDirect provides to make custom injection plastic parts.

Tooling materials

Before injection molding process starts low or high-volume production, a high tolerance CNC machined tooling is needed. Most commonly used materials include:

Tool Steel:
Carbon Steel:
5052, 6061

Plastic materials

Plastic injection molding service comes with a wide range of materials with different properties, including impact strength, rigidity, thermal resistance, chemical resistance, etc.

  • ABS
  • Nylon (PA)
  • PC
  • PU
  • PMMA
  • PP
  • PE
  • HDPE
  • PS
  • PC
  • PVC
  • PEEK
  • POM
flexible plastic raw material

Additives and fibers

Standard plastic materials may not meet custom injection molding parts requirement. In this case, additives and fibers can be added to improve aesthetic and functional properties, providing additional features for your injection molded parts.

  • UV absorbers
  • Flame retardants
  • Plasticizers
  • Colorants
  • Carbon fibers
  • Glass fibers
rubber plastic material

Injection Molded Parts Surface Finishes

For most of the injection molded parts, no post-processing is needed. This is because the mold itself are usually finished to different levels and directly affect the surface finish of molded parts.


A grade finishes are made using a diamond buffing process and yield shiny and glossy surfaces on injection molded parts.

SPI Standard:
A1, A2, A3
glossy finish


B grade finishes use grit sandpaper to produce parts with a slightly rougher finish than grade A parts. Custom molded plastic parts that undergo B grade finishing have a matte surface texture.

SPI Standard:
B1, B2, B3
semi-glossy finish


C grade finishes use grit sanding stones to produce a rough, uneven surface. Injection plastic parts that undergo C grade finishing have a matte surface texture.

SPI Standard:
C1, C2, C3
matte finish


D grade finishes use grit and dry glass beads or oxide to produce a very rough textured finish. Depending on the type of material used, products can have a satin or dull finish.

SPI Standard:
D1, D2, D3
textured finish
RD image decor

Our Quality promise

  • ISO 9001:2015
  • Full dimensional report
  • Material certification
  • First article inspection
  • Reword & refund policy
our quality assurance RD decor dot RD decor Leaf

Try RapidDirect now,
for free

All information and uploads are secure and confidential.