Co Injection Molding Services From China
As a leading co-injection molding manufacturer, Formioo operates its own advanced production facility and partners with a network of over 200 trusted suppliers. We deliver precision tolerances of up to ±0.01 mm co-injection molding parts.
- 50+ Certified Materials & 15+ Surface Finishing Options
- Massive Manufacturing Experience with strong supply chain
- Both economical mass production and prototype solutions
- Global quality standard assurance through ISO 9001:2015 Certification
- Highly accurate Co Injection Molding with tolerances of ±0.01 mm or tighter
Co Injection Molding Small Batch Production
We at Formioo provide low-cost, stable, and scalable co-injection molding manufacturing services to medical, electronics, automotive, and industrial equipment sectors. Our rapid prototyping to mass production is made possible by our high-quality production that delivers each part with exceptional precision and consistency.
Formioo has its own state-of-the-art manufacturing plant and is allied with a network of over 200 screened out suppliers to provide a range of co-injection molding capacities. Be it low-volume manufacture or high-volume production, our ISO 9001:2015-certified quality system offers close tolerances of up to ±0.01 mm on more than 50 materials and 15 finishes.
Being a prominent Co-Injection Molding manufacturer, Formioo focuses on delivering cost-efficient, high-quality parts with quick turnaround rates. All our custom-made components are priced competitively without undermining quality.
Our Co Injection Molding Services
Our own manufacturing facility specializes in Co-Injection Molding technology, utilizing the most advanced methods such as sequential, simultaneous, sandwich, and skin-core processes to produce multi-layer parts. Equipped with high-quality machinery and strict quality controls, we deliver high precision and reliable performance in quick prototyping and high-volume production. Our door-to-door manufacturing process provides speedy turnaround time, cost-effective production, and many optional finishing possibilities to meet different industrial needs.
This method injects materials in a set sequence, creating distinct layers that optimize both surface aesthetics and core properties.
In simultaneous injection, two or more materials are fed simultaneously to deliver a homogeneous bond and even interface among layers.
Sandwich molding inserts a core material between two outer skins to construct impact strength and structural stiffness in end parts.
Skin-core molding produces a thin, high-performance outer skin over a low-cost core, with aesthetics and function being balanced in parts.
Co Injection Molding Capabilities
Material Compatibility
Our capable of molding engineering plastics (POM, ABS, Nylon, PEEK, etc.), meeting various industrial and custom production needs.
Printing Accuracy
Our standard tolerance is controlled within ±0.01mm, ensuring high precision for medical, electronic, and industrial applications.
Maximum Build Size
Our biggest part size is 1000mm × 600mm × 500mm, best for small and medium-sized parts.
Surface Finishing Options
Polishing, sandblasting, powder coating, electroplating, laser engraving, etc. are offered by us to enhance durability and beauty.
Delivery Time
Our typical Co Injection Molding lead time is 5-10 days with the rush service available for emergency jobs.
Our Latest Co Injection Molded Products We Have Manufactured
Explore our precision-engineered Co Injection Molded parts and see the quality for yourself. From prototyping to mass production, our high-precision components meet the toughest industry standards. Visit our website to view our finished products and discover how we can meet your manufacturing needs.
Co Injection Molding Tolerance
| Name | Tolerance Range |
|---|---|
| Standard Co-Injection Parts | +/- 0.3 mm to +/- 0.6 mm |
| Precision Co-Injection Parts | +/- 0.1 mm to +/- 0.3 mm |
| Complex Co-Injection Parts | +/- 0.2 mm to +/- 0.5 mm |
- *Formioo accommodates part lengths of up to 48", depending on the process. For larger dimensions, please reach out to us for inquiries. The tolerances listed represent minimums under ideal conditions; however, looser tolerances may be necessary based on the process, material selection, or part geometry.
Co Injection Molding Materials
PP
Polypropylene (PP) is particularly suited to Co Injection Molding as it has low density, very good chemical resistance, and high melt flow properties. PP can develop tough, well-bonded layers, which make it ideal for the construction of products requiring a hard outer shell coupled with a soft inner core. In practice, PP is applied to produce automotive interior panels, battery cases, and consumer packaging. As an example, co-injected battery housings combine the strength of PP with light weight functionality to offer security and stability when put in daily usage. Its economical nature and versatility make PP a standard choice for quantity production.
- Mill Lead Time: 2 days
- Color: Natural white with customizable tints
PE
Polyethylene (PE), high- and low-density, is highly processible and chemically stable for Co Injection Molding. Its smooth flowing nature enables it to be used to manufacture parts with a durable outer skin and an energy-absorbing, compliant interior. In practice, PE is widely utilized in manufacturing storage tanks for fluids, piping systems, and protective housings. For instance, co-molded tanks utilize PE’s resistance to water and uniform layer bonding for greater durability even in harsh conditions. Its high versatility and low cost allow it to be applied for both mass-produced and specialized components.
- Mill Lead Time: 3 days
- Color: Translucent base with a range of vibrant options
PS
Polystyrene (PS) is used in Co Injection Molding because of the ease of processing, dimensional stability, and creation of clean interfaces between layers. Its hardness is balanced with a soft inner layer that improves impact resistance. In everyday use, PS is used in consumer electronic housings, appliance panels, and decorative elements. For example, enclosures for electronic devices are co-molded using PS to achieve a neat, shiny exterior with a cushioned interior that is beneficial in protecting delicate components. Being inexpensive and precise in processing, PS is an available option even in production volumes as well as for prototypes.
- Mill Lead Time: 2–3 days
- Color: Glossy clear or available in multiple colors
PVC
Polyvinyl Chloride, or PVC, is applicable for Co Injection Molding due to its better resistance to weather, chemicals, and easy customization. Its inherent ruggedness allows for the presence of a tough outer covering with an internal shock-absorbing layer. In application, PVC finds substantial use in window frames, piping systems, and cable insulation. As an instance, construction’s co-molded PVC components receive added impact strength and extended life even when exposed to extreme weather conditions. Its flexibility and reliability in performance under varied circumstances make PVC a popular material for industrial as well as household products.
- Mill Lead Time: 3–4 days
- Color: Base white or gray with customizable finishes
PC
Polycarbonate (PC) is significantly invested in Co Injection Molding since it has excellent impact strength, transparency, and heat resistance. Its properties allow the production of parts with a scratch-free, transparent outer cover and hard, shock-absorbing center. PC finds applicability in optical lenses, protective covers, and electronic device enclosures in real-world applications. For example, consumer electronics co-molded protective enclosures utilize PC’s strength and clarity to deliver appearance and strength. PC’s unique properties set it apart as an ideal material to utilize for precision and reliability components.
- Mill Lead Time: 5 days
- Color: Transparent or tinted, with clear options available
PA
Polyamide (PA) or, quite simply, Nylon, as most commonly known, is tremendously favored in Co Injection Molding because its increased mechanical strength, wear, and impact toughness are better. Its good compatibility with other materials renders it best applicable to multi-layered applications requiring a tough outer skin and an energy-absorbing core. PA, in application, is used in the production of gears, fasteners, and structural components utilized in the automotive and industrial sectors. For instance, co-molded fasteners exhibit increased durability and low friction, providing stable performance in dynamic mechanical applications. Its capacity to process and support loads is a significant advantage.
- Mill Lead Time: 4–5 days
- Color: Natural off-white to light brown tones
POM
Polyoxymethylene, or POM, is chosen for Co Injection Molding since it exhibits good dimensional stability, a low friction coefficient, and resistance to fatigue life. It can also be utilized to produce parts with hard, high-strength surfaces and a low-hardness center acting as an impact protector. POM is widely used in practical applications for manufacturing precision gears, bearings, and other moving components in daily use. For example, auto transmission co-molded POM components exploit higher accuracy and cyclic load endurance. Owing to its excellent machinability and long-term stability, POM is used in demanding engineering applications.
- Mill Lead Time: 5 days
- Color: Cream or off-white with natural appearance
PEEK
PEEK is a premium material for Co Injection Molding in high-performance applications due to its exceptional thermal stability, chemical resistance, and mechanical performance. Its co-injectability also allows it to be used with components having a hard, heat-resistant outer layer and a more pliable core. In real-life applications, PEEK can be utilized in aerospace components, medical equipment, and high-stress industrial components. Co-molded PEEK components in aircraft components is one such application, showing outstanding performance under very high or low stress and temperature for security and strength. Its capability to perform well in harsh environments makes it invaluable in mission-critical applications.
- Mill Lead Time: 7–10 days
- Color: Natural amber or customizable shades
PPS
Polyphenylene Sulfide (PPS) is used for Co Injection Molding to produce high-performance parts due to its superior thermal stability, chemical resistance, and dimensional stability. Co-injection allows PPS to produce parts with a hard outer surface and soft inner core to improve impact absorption. In reality, PPS finds use in automotive under-hood components, electrical connectors, and industrial machinery parts. For example, co-injected PPS parts used in engine compartments offer excellent reliability through being able to endure severe temperatures and chemical resistance, sustaining long-term performance. Its toughness and precision are the core of its application.
- Mill Lead Time: 6–8 days
- Color: Typically gray, with adjustable color formulations
PI
Polyimide (PI) is a great material for Co Injection Molding, well known for high-temperature resistance, excellent mechanical properties, and electrical insulation. Its use in co-molded parts results in a hardened outer layer and a resistant inner layer that takes the shock of impact. In practical use, PI is used broadly in aerospace, electronic, and industrial applications such as high-performance circuit boards and thermal management parts. For instance, aerospace applications which utilize co-molded PI parts experience stable performance during long-term thermal stress and vibration, guaranteeing the performance and safety of advanced technology.
- Mill Lead Time: 8–10 days
- Color: Typically yellowish-brown, with potential for customization
PEI
Polyetherimide or PEI has excellent suitability for Co Injection Molding due to its excellent heat resistance, flame resistance, and dimensional stability. Its properties make it possible to produce parts with a high-performance, rugged exterior surface and an impact-resistance interior layer. PEI finds extensive use in actual applications in high-end electrical enclosures, aerospace components, and medical equipment. For instance, co-molded PEI components for electronic devices offer fire resistance as well as mechanical stiffness in harsh thermal conditions. Its higher heat and stress performance renders it an ideal option for high-end, high-reliability uses.
- Mill Lead Time: 7 days
- Color: Natural light brown with options for custom coloration
Finishing Options for Co Injection Molding
| Name | Applicable Materials | Colors | Can Be Applied with | |
|---|---|---|---|---|
|
Polishing | Plastic, Metal | — | Buffing, Tumbling |
|
Electroplating | Plastic, Metal | Chrome, Gold, Silver | Electroplating Bath |
|
Anodizing | Aluminum, Metal | Clear, Black, Gold | Media Blasting, Tumbling, Anodizing |
|
Powder Coating | Plastic, Metal | Custom Colors | Spray Application |
|
Painting | Plastic, Metal | Custom Colors | Spray, Dip, or Brush Application |
|
Laser Etching | Plastic, Metal | — | Laser Machines |
|
UV Coating | Plastic, Rubber | Glossy, Matte | UV Curing Process |
|
Silk Screening | Plastic, Rubber | Multiple | Manual or Automated Process |
|
Bead Blasting | Plastic, Metal | — | Sandblasting, Abrasive Blasting |
|
Surface Texturing | Plastic, Rubber | — | Mold Texturing, Laser Etching |
- *We offer a range of additional finishing options, including chromic acid anodizing, cadmium plating, copper plating, titanium anodizing (blue anodizing), gold plating, silver plating, and more. If you require finishes for materials not mentioned here, please reach out to us directly.
Co Injection Molding FAQs
Can you handle complex part geometries?
Yes! We can use a lower-cost base material with an outside surface of high quality.
Can you do color-matching on parts?
Yes. Our co-injection system enables precise control of each color for the two layers.
What is the minimum order quantity (MOQ)?
MOQ is adjustable. Let’s discuss your project specifics.
How long does tooling take?
Typically 4-6 weeks, but we can expedite if needed.
Can you ensure consistent layer thickness?
Yes, our advanced technology guarantees uniform layer distribution.
Do you provide design assistance?
Yes! Our engineers will co-injection mold improve your design.
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