Custom Plastic Parts Manufacturing

Plastic Injection Molding
Plastic Parts Prototyping
Overmolding & Insert Molding

Plastic is a synthetic material made from polymers, which can be molded or shaped into various forms while maintaining its durability and structural integrity. They have become an integral part of modern life due to their wide range of applications and properties. Due to its versatility, durability, lightweight and excellent electrical and thermal insulation properties, it’s always used for producing custom parts for auto, toys, food packages and other industries. Sometimes plastic is a better alternative to metal when complies with the appropriate part design.

Custom plastic parts refer to plastic components or products that are specifically designed and manufactured to meet unique or customized requirements. These parts are typically produced through various plastic molding processes, such as injection molding, extrusion, blow molding, or thermoforming. At Sungplastic, we have many years experiences of custom plastic parts manufacturing and mature technology.

Commonly Used Plastics Materials

There are numerous plastic materials available, each with its own unique properties and characteristics. The choice of plastic material depends on the specific application and the desired properties of the final product.

    • Polyethylene (PE)
      Lightweight, good chemical resistance, flexible, and widely used in packaging, containers, and plastic bags.
      Types: Low-density polyethylene (LDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE)
    • Polypropylene (PP)
      High chemical resistance, good impact strength, and used in applications like packaging, automotive parts, and medical devices.
    • Polyvinyl Chloride (PVC)
      Rigid PVC is used in pipes, fittings, and construction materials, while flexible PVC is used in products like cables, hoses, and inflatable structures.
      Types: Rigid PVC (uPVC) and flexible PVC (soft PVC)
    • Polystyrene (PS)
      Lightweight, rigid, and used in packaging, disposable cutlery, and insulation.
      Types: General-purpose (GPPS) and high-impact (HIPS)
    • Polyethylene Terephthalate (PET)
      Transparent, strong, and used in beverage bottles, food containers, and textile fibers (polyester).
    • Polycarbonate (PC)
      High impact resistance, clarity, and used in eyeglass lenses, CDs/DVDs, and bulletproof glass.
    • Acrylonitrile-Butadiene-Styrene (ABS)
      Good impact resistance, strength, and used in automotive parts, electronics, and consumer goods.
    • Polyurethane (PU)
      Flexible or rigid, excellent wear resistance, and used in foam cushions, adhesives, and elastomers.
    • Nylon (Polyamide)
      High tensile strength, wear resistance, and used in gears, bearings, and textiles.
      Types: Nylon 6, Nylon 66, Nylon 12, etc.
    • Polyethylene Glycol (PEG)
      Water-soluble, biocompatible, and used in pharmaceuticals, cosmetics, and as a lubricant.
    • Polyvinylidene Fluoride (PVDF)
      Excellent chemical resistance, UV stability, and used in chemical processing equipment and electrical insulation.
    • Polybutylene (PB)
      Flexible, resistant to high temperatures, and used in plumbing applications.
    • Polymethyl Methacrylate (PMMA)
      Transparent, lightweight, and used in acrylic glass (e.g., Plexiglas) and optical lenses.

At Sungplastic, we have 20+ years of experience in producing custom plastic products. We are very familiar with the characteristics of various plastic injection molding processes. If you have some doubts about plastic selection, please contact us to discuss further. We will use our professional knowledge to give you the best advice.

Custom Plastic Parts Methods

Custom plastic parts can be produced using various manufacturing processes or methods, depending on the complexity of the part, desired material properties, production volume, and cost considerations. Here are some common processes and methods for manufacturing custom plastic parts.
LED lens injection molding

Injection Molding

Suitable for complex parts, high-volume production, tight tolerances.
Injection molding prototyping for low volume production.

TPE overmolding on plastic part


Overmolding is used in the production of tool handles, grips, seals, and various consumer electronics. It can also create parts with multiple colors or materials in a single component.
insert moulding

Insert Molding

Insert molding is a process similar to overmolding, where a preformed metal part is loaded into a mold and then overmolded with a thermoplastic resin to form the final assembly.
CNC plastic machining

CNC Machining

CNC machining is using precision machining tools, such as mills, lathes, and routers, to cut, shape, and finish plastic workpieces. The process can achieve tight tolerances and complex geometries.

3D prototyping

3D Printing

3D printing involves creating custom plastic parts layer by layer from a digital 3D model. Suitable for prototyping, complex geometries, low-volume production.
injection blow molding

Blow Molding

Blow molding is used to create hollow parts by inflating a heated plastic parison inside mold cavities. Common applications: plastic bottles, containers, automotive ducts.

Common Applications for Custom Plastic Parts

Custom plastic parts find applications in a wide range of industries and products due to their versatility, cost-effectiveness, and ability to be tailored to specific requirements. Here are some common applications for custom plastic parts:

    • Automotive Industry
      Custom plastic parts are used in vehicle interiors and exteriors, including dashboard components, door panels, bumpers, trim, and engine components.
    • Consumer Electronics
      Custom plastic parts are integral to the production of smartphones, laptops, tablets, and other electronic devices, including cases, buttons, and connectors.
    • Medical Devices
      Custom plastic parts are used in the manufacturing of medical devices such as syringes, catheters, IV connectors, and housings for diagnostic equipment.
    • Packaging
      Custom plastic parts are used for packaging materials such as bottles, containers, caps, and closures, providing durability and protection for various products.
    • Aerospace and Aviation
      Custom plastic parts are used in aircraft interiors, including seating components, cabin fixtures, and interior panels, as well as exterior components like wingtips and fairings.
    • Industrial Machinery
      Custom plastic parts are employed in machinery and equipment for industries like manufacturing, agriculture, and construction, serving as gears, bushings, and structural components.
    • Toys and Recreational Products
      Custom plastic parts are used in the production of toys, sporting goods, and recreational equipment such as action figures, board game pieces, and kayak components.
    • Electrical and Wiring Systems
      Custom plastic parts are utilized in electrical and wiring systems, including cable connectors, switches, and insulators.
    • Plumbing and Fluid Handling
      Custom plastic parts are essential in plumbing systems, with applications in pipes, fittings, valves, and connectors due to their corrosion resistance.
    • Furniture
      Custom plastic parts are incorporated into furniture components like chair and table legs, armrests, and decorative elements.
    • Food and Beverage Industry
      Custom plastic parts are used in food processing and packaging equipment, as well as restaurant and kitchen appliances.
    • Environmental and Water Treatment
      Custom plastic parts are found in water treatment plants, sewage systems, and environmental control equipment, including pumps, valves, and filtration components.
    • Renewable Energy
      Custom plastic parts play a role in renewable energy systems, such as wind turbine components and solar panel mounting hardware.
    • Healthcare and Laboratory Equipment
      Custom plastic parts are used in laboratory equipment, diagnostic devices, and dental instruments due to their chemical resistance and ease of sterilization.
    • Custom Displays and Signage
      Custom plastic parts are used to create displays, signs, and promotional materials, often with unique shapes and designs.
    • Military and Defense
      Custom plastic parts are utilized in military equipment and vehicles for various applications, including armor, weapon components, and communication systems.

At Sungplastic, we have been committed to providing customized plastic products services to customers in various industries, and have been satisfied and recognized by customers. We have rich manufacturing experience for your reference. Please read our manufacturing cases and browse the molded product gallery.

water to go bottle manufacturer

Sports Bottle

Provide product design, injection molding and blow molding services.

car water tank manufacturer

Car Water Tank

Mold making, injection molding and ultrasonic melting services.

led lens manufacturers

LED Lens

Light distribution design, mold tooling and precision injection molding services.

One-stop Manufacturer for Custom Plastic Parts

We provide one-stop plastic manufacturing services: from product design, manufacturing of plastic prototypes, injection mold engineering and manufacturing, high-volume injection molding processing, until assembly and shipping. Our communication and exchange will run through:

    • Plastic Part Design
      Custom plastic parts are designed to meet specific size, shape, and functionality requirements. Design engineers work closely with clients to create detailed CAD (Computer-Aided Design) models to ensure the part’s precise specifications.
    • Material Selection
      The choice of plastic material depends on the desired properties of the part, such as strength, flexibility, transparency, chemical resistance, and temperature tolerance. Different plastics have distinct characteristics, and the selection is based on the intended application.
    • Production Method
      The production process for custom plastic parts is determined by factors like the complexity of the design, required quantities, and budget constraints. Common methods include injection molding (for complex shapes and high volumes), extrusion (for continuous shapes like pipes or profiles), and thermoforming (for large, thin parts).
    • Tolerances and Quality
      Custom plastic parts must meet specific tolerance and quality standards to ensure they perform as intended. Quality control measures are implemented throughout the manufacturing process to maintain consistency and meet these standards.
    • Color and Surface Finish
      Clients can choose the color and surface finish of custom plastic parts to match their branding or aesthetic preferences. This customization can involve painting, texturing, or other finishing processes.
    • Assembly
      In some cases, custom plastic parts may need to be designed for easy assembly with other components or parts to create a larger product or system.
From the beginning of product design and prototype production, we will maintain agile and effective communication with you. Let you know more and more clearly about your product manufacturing process. We believe that in this process, your trust in us will be established unconsciously. At the same time, we are also looking forward to cooperating with you.

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