Plastic Injection Molding Services

Custom plastic injection molding for prototypes, new product introduction and production parts.

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

Save 30% budget in average

about us banner image

What Makes GUAN SHENG Ideal for Plastic Injection Molding

strong capabilities


Our plastic injection molding service provides a wide range of plastic injection molding processes, along with 100+ materials and surface finishes to suit even your most unique needs.



Enabled by our advanced capability factories in China, our plastic injection services provide quotation from 1 business day. In addition, no MOQ makes it feasible for intial development and ramp periods.

assured high quality


Injection molding with GUAN SHENG is at ease. We provide free DFM feedback, certifications and production update through the manufacturing process. You can always count on us!

Our online CNC machining services

With over 200 sets of 3, 4, and 5-axis CNC machines in China, GUAN SHENG is your ideal choice for outsourcing custom and precision CNC machining services. We provide more than 100 different types of materials and surface finishes with experience in a seamless transtion from prototype through production. Lead time as short as days.

cnc milling

CNC Milling Service

3-axis CNC milling price rate from $10 per hour, 5-axis CNC milling center highest tolerance up to ±0.0008″ (0.02 mm) Cost-effective CNC milling parts manufacturer for prototype machining and production parts.

CNC Turning Service

Self-owned workshop with 50+ CNC Lathes and CNC turning centers, providing cost-effective prototype and production machining services with fast lead times. Live tooling available for complex projects.

cnc turning

Plastic Injection Molding Capabilities

rapid tooling

Rapid tooling

Fast and cost-effective process for creating aluminum or steel injection molds. 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 production of multi-color and multi-layers products.

insert molding

Insert molding

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

Liquid Silicone Rubber injection molding

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

silicone rubber mold

Plastic Injection Molding Materials

Injection molding has the most variable options for materials, colors, and configurations when compared to CNC machining or 3D printing. Here are the materials GUAN SHENG provides for injection molding services.

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.

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. Products 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. Products 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

Quality promise

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

to get Free Sample
right away

All information and uploads are secure and confidential.