When considering custom injection molding, it's of great importance to assess the complexity level of your project and let that dictate the customization level you need not only from the injection mold toolings themselves, but from front-to-back in working with molders.
Custom injection moulding depends on multiple scientific methods, analytical tools and injection moulding process technology in order to meet the precision and performance requirements for complex plastic components and applications. Although faster time to market is a definite consideration for custom injection molding projects, it isn't pursued at the cost of part design, injection moulding material selection, mold design and injection moulding process control. In order to achieve product design and end-use goal accurately, custom injection molders will use these key product development stages to inform choices about the appropriate injection moulding process step by step such as scientific molding, insert molding, multi-shot molding, overmolding, etc.
Injection moulding applications: Injection molding involves injecting hot, molten plastic material into a mold, which is then cooled and solidified to form the product. Injection moulding method is suitable for the mass production of complex products, especially in the field of plastic processing that occupies a large proportion.
Electronics
Injection molding enables the production of precise housings, connectors, and protective casings for consumer and industrial electronic devices.
Medical
Sterile, high-precision plastic components such as syringes, surgical instruments, and device housings are manufactured through injection molding.
Automotive
From dashboards to gears and trims, injection molding provides lightweight, durable, and cost-effective parts for vehicle interiors and mechanical systems.
Food And Beverage
Injection molding produces food-grade containers, packaging, and dispensing components that meet hygiene and safety standards.
Gardening
Durable and weather-resistant products like planters, irrigation fittings, and tool handles are efficiently created with injection molding.
Industry
Injection molding supports industrial applications with strong, chemical-resistant components such as machine housings, gears, and fasteners.
The injection molding process is a streamlined, end-to-end workflow that transforms product ideas into high-quality molded parts. From design submission to final delivery, each stage is carefully managed in Keyplast to ensure precision, efficiency, and reliability.
Customers submit their 3D CAD files to initiate the project.
A detailed quote is provided along with a Design for Manufacturability (DFM) analysis to optimize the part design.
The first test sample (T1) is produced for evaluation and approval before mass production.
Full-scale injection molding production starts using validated tooling and materials.
Every batch undergoes strict quality checks to ensure dimensional accuracy and performance.
Finished parts are packaged and shipped to the customer on time.
At Keyplast, we provide end-to-end injection molding solutions ranging from rapid prototyping to low volume runs and full-scale mass production, ensuring precision, flexibility, and cost-efficiency at every stage.
At Keyplast, we combine advanced machinery with skilled technicians to deliver precise and reliable prototyping injection molding solutions. By working with a wide range of materials, we create high-quality prototypes that help validate designs, test functionality, and accelerate product development across industries such as automotive, electronics, and medical devices. Our expertise ensures accuracy and consistency from the very first sample.
We understand that not every project requires mass production. That’s why Keyplast provides flexible low volume injection molding services tailored to your unique requirements. From product design and material selection to tooling and production, we collaborate closely with clients to achieve the perfect balance of quality, speed, and cost-effectiveness. This makes us the ideal partner for pilot runs, custom parts, or market testing.
As a trusted partner in China’s injection molding industry, Keyplast delivers efficient and cost-effective mass production solutions without compromising on quality. Our streamlined processes, local sourcing, and rigorous quality control systems ensure that every part meets international standards. With timely delivery, competitive pricing, and reliable performance, we help businesses scale with confidence while maintaining customer satisfaction at every stage.
At Keyplast, we understand that the choice of material is critical to the performance, durability, and appearance of every molded part. Our injection molding materials include a wide range of thermoplastics such as polyethylene (PE), polypropylene (PP), ABS, polycarbonate (PC), nylon (PA), polystyrene (PS), and elastomers like TPE/TPU.
ABS is a versatile thermoplastic widely used in automotive parts, consumer electronics, and household goods. It features excellent heat resistance, a relatively low melting temperature for efficient molding, and outstanding resistance to corrosive chemicals. Its combination of toughness, dimensional stability, and adaptability makes ABS an ideal choice for high-demand applications requiring precision and long-lasting performance.
Applications:
Automotive Industry
Consumer Electronics
Household Goods
Industrial Applications
Acrylic is a transparent polymer known for its excellent tensile and bending strength, offering performance comparable to polycarbonate at a lower cost. With its crystal-clear appearance, outstanding weather resistance, and UV stability, PMMA is ideal for applications such as outdoor displays, signage, lighting covers, and protective panels. More durable than glass, it maintains clarity and strength over time, making it a reliable choice for both functional and aesthetic components.
Applications:
Lighting & Displays
Signage & Advertising
Consumer Products
Automotive & Transportation
Acetal is a high-performance thermoplastic known for its excellent dimensional stability, low moisture absorption, and outstanding resistance to chemicals. Its low friction and high strength make it ideal for precision mechanical components such as gears, bearings, fasteners, and other high-stress parts where accuracy and durability are critical. With superior wear resistance and consistent performance, Acetal is a trusted choice for demanding engineering applications.
Applications:
Automotive Industry
Industrial & Mechanical Components
Consumer Electronics & Appliances
Medical & Laboratory Equipment
Nylon is a high-performance plastic known for its excellent mechanical strength, rigidity, and resistance to chemicals and high temperatures. With outstanding wear resistance, low friction, and flexibility, it is widely used in industrial applications such as gears, bearings, fasteners, and automotive components. Its durability and abrasion resistance make Nylon an ideal choice for parts that must withstand continuous stress and maintain dimensional stability over time.
Applications:
Automotive Industry
Industrial & Mechanical Components
Consumer & Electronics Applications
PEEK is a high-performance thermoplastic renowned for its exceptional resistance to chemicals, radiation, and extreme temperatures. With outstanding mechanical strength and dimensional stability, PEEK is ideal for demanding applications in aerospace, automotive, and medical industries, where components must maintain reliability and performance under harsh conditions.
Applications:
Aerospace
Automotive
Medical
Electronics
Industrial
PET injection molding produces parts that are strong, lightweight, and highly resistant to chemicals and moisture. Widely used for food containers, beverage bottles, and packaging, PET combines durability with excellent recyclability, making it an eco-friendly choice for diverse applications.
Applications:
Food & Beverage Packaging
Consumer Goods
Textiles & Fibers
Industrial Applications
Automotive
PLA injection molding offers a sustainable solution using a biodegradable, plant-based polymer. Known for its clarity, ease of processing, and eco-friendly nature, PLA is widely used in packaging, disposable products, and consumer goods where environmental responsibility is a priority.
Applications:
Packaging
Consumer Goods
Medical Applications
Textiles & Agriculture
3D Printing & Prototyping
PVC injection molding produces strong, durable, and cost-effective parts with excellent chemical resistance. Its versatility makes PVC ideal for applications in plumbing, medical devices, electrical components, and construction materials.
Applications:
Plumbing & Construction
Medical Devices
Electrical Applications
Consumer Goods
Automotive
Polymer injection molding is a versatile manufacturing process that shapes a wide range of plastics into precise, durable parts. Known for its efficiency and scalability, it is widely used across industries such as automotive, electronics, medical, and consumer goods.
Applications:
Automotive
Electronics
Medical
Consumer Goods
Industrial
Packaging
PP injection molding produces lightweight, durable, and cost-effective parts with excellent chemical resistance and flexibility. Widely used in automotive, packaging, medical, and consumer products, polypropylene is valued for its versatility and recyclability.
Applications:
Automotive
Packaging
Medical
Consumer Goods
Textiles & Fibers
Industrial Applications
Polystyrene injection molding creates lightweight, rigid, and cost-effective parts with excellent clarity and dimensional stability. Commonly used in packaging, disposable products, medical devices, and consumer goods, polystyrene is valued for its versatility and ease of processing.
Applications:
Packaging
Medical Devices
Consumer Goods
Electronics
Display & Signage
Industrial Applications
As a professional plastic moulding business, Keyplast China plastic injection molding company specializes in molding industry for 40 years. We provides one-stop turnkey solution, from product design, prototyping, mould design, injection moulding process step by step, sample confirmation, mass production, packaging, shipping and after-sale service. We help to provide efficient and professional suggestions for our clients, thus bringing their concepts into reality.
Keyplast has a professional R&D and Engineering Team of 13 engineers. Per your 2D/3D drawings and samples, we could make moulds design such as overmold design and then send you for confirmation. If any defects, such as the issue of demoulding issue or sink marks, we will offer professional suggestion to improve your drawings or modify the drawings according to your request.
Once we receive your request for injection molding, our engineers will check the structure and usage of your product and recommend the best plastic material for your project. We have a professional supply chain of plastic materials, which not only provides the plastic injection moulding raw materials of best quality but also the competitive price of plastic injection moulding for sale. It will benifit all the parties in the project, especially our clients.
In current, Keyplast has 9 injection molding machines of different tonnage, ranging from 90ton to 650ton, which can meet the needs of different sizes of products for different clients or different types of injection moulding products for the same client.
Keyplast has strict quality control of injection molding process steps for each project. We have a effecient follow-up team for the sophisticated management of each step, including drilling, deep hole drilling, CNC milling, high speed CNC milling, grinding, boring, lathing, polishing and assembly. Meanwhile, we have complete moulding implement of professional digital management to avoid manual errors.
Once we receive the inquiry from our client, Keyplast, injection molding business, will forward the drawings or samples to our engineers, check the material, structure and quantity, and then offer the quote to our clients within 24 hours. Every two weeks we will send moulds schedule to our clients and keep the moulding progress updated mutually. If any confusion, our service team will send the feedback within 24 hours to avoid any misunderstanding.
At Keyplast, we apply a precise step-by-step polishing process to achieve superior injection molding surface finishes. This ensures every molded part meets exacting standards of smoothness, durability, and visual quality without rework.
Keyplast offers customized textured finishes to enhance grip, aesthetics, and functionality. Our precision techniques ensure consistent, durable textures across every molded part.
Our expert polishing process delivers smooth, high-gloss surfaces that elevate both appearance and performance. Each part is finished to meet strict quality and visual standards.
With advanced sandblasting, we create uniform matte finishes that reduce glare and improve surface durability. Keyplast ensures a professional, clean look tailored to your product’s needs.
Injection molding quality inspection is critical to ensuring every part meets the highest standards of precision, durability, and reliability. From raw materials to final delivery, our strict inspection process guarantees consistent performance and customer satisfaction.
Advanced Measurement Tools
State-of-the-art equipment ensures dimensional accuracy and consistency.
Rigorous Material Checks
Every batch of material is tested for strength, durability, and compliance.
In-Process Monitoring
Continuous inspection during molding prevents defects before they occur.
Surface Finish Control
Each part is checked to ensure flawless appearance and texture.
Final Performance Testing
Functional testing validates that every product performs as intended.
Both overmolding and insert molding are specialized injection molding techniques that combine multiple materials into a single finished part. Overmolding enhances function and comfort by combining different plastics, while insert molding integrates non-plastic components directly into the molded part for strength and functionality.
Injection Pressure
Injection Time
Injection Temperature
Holding Pressure and Time
Back Pressure
Select the Casting Material
The Design should be Scientific and Reasonable
Perfect Quenching Process
Mold Assembly
Maintenance
The finish of the injection mold is poor, the surface of the cavity has rust, etc., and the mold exhaust is not good.
Too many recycled materials are used, the quality of plastics or colorants is poor, mixed with water vapor or other impurities, and the quality of lubricants used is poor.
The gating system of the injection mold is defective, and the cold slug well should be enlarged, and the runner, the polishing main runner, the runner and the gate should be enlarged.
The material temperature and mold temperature are low, if necessary, the local heating method of the gate can be used.
Check whether the Injection Mold Manufacturer has Formal Three-certificate Information
Look at the Cooperation Cases and the Display of Finished Products
On-site Inspection of the Injection Mold Manufacturer's Factory
Injection moulding process cycle time, the maintenance of the injection moulding process mold, the quality of the injection moulding process.
Guide components: guide pins and guide bushes; Ejection mechanism: ejection fixed plate and the ejection plate; Side core pulling mechanism.
Use high-speed injection molding machines
Use good cooling system
