PE (Polyethylene) Injection Molding Service
We offer professional polyethylene (PE) injection molding services, delivering customized PE plastic parts in as little as 10 days. Reliable quality, professional support, and flexible solutions meet your project needs.
A Professional Polyethylene (PE) Injection Molding Service Provider
Elimold boasts over 15 years of experience in manufacturing technical plastic products. Our core business is injection molding, and we are committed to continuous growth in this field. As your trusted partner, we are happy to discuss the entire project with you, from product drawings and mold design to final mass production and process optimization. We are dedicated to serving you. We utilize state-of-the-art injection molding technology to produce a wide range of PE (Polyethylene) plastic products. As a professional company, we have deep expertise in the injection molding industry, enabling us to provide our clients with professional knowledge, superior quality, excellent service, and flexible solutions.
Complete Production Support Team
We have a dedicated manufacturing team working behind the scenes to meet your production order needs. We manage the entire process and keep you updated on the latest progress.
Engineering & DFM
Mold Making
Injection Molding
Surface Treatments
Quality and Compliance
Assembly and Shipping
What is polyethylene (PE)?
Polyethylene (PE) is a crystalline raw material polymerized from ethylene monomers (repeating units are –CH₂–CH₂–, usually written as (C₂H₄)ₙ), belonging to the polyolefin family. PE materials have extremely low hygroscopicity, not exceeding 0.01%, and exhibit good flexibility in intermolecular bonding, weak bonding forces, low melt viscosity, and excellent flowability. Furthermore, PE has a wide shrinkage range, large shrinkage values, and a pronounced directionality. Moreover, this material has a molecular weight range of 10,000 to 1,000,000. Ultra-high molecular weight polyethylene (UHMWPE) has a molecular weight exceeding 100,000. Higher molecular weight generally results in better physical and mechanical properties, more closely meeting the requirements of engineering materials. However, higher molecular weight also increases the difficulty of processing.
Characteristics of Polyethylene (PE) Material
Polyethylene generally possesses advantages such as being lightweight, chemically resistant, and electrically insulating. Its melting point is 100-130°C, exhibiting excellent low-temperature resistance, maintaining good mechanical properties even at -60°C. However, when exposed to the atmosphere, sunlight, and oxygen, polyethylene will age, discolor, crack, become brittle, or powder, losing its mechanical properties.
Moreover, polyethylene has good chemical stability and can withstand corrosion from solutions at room temperature. However, it is not resistant to corrosion from strong oxidizing solutions. Strong oxidizing solvents will slowly corrode polyethylene at room temperature, especially concentrated sulfuric acid and concentrated nitric acid, which will rapidly corrode polyethylene at 90-100°C, leading to its destruction or decomposition.
Advantages of PE Injection Molding
Chemical Resistance
Polyethylene has excellent chemical resistance, tolerating a certain degree of corrosion from acids, alkalis, and salts.
Design Flexibility
PE materials have good flowability during injection molding, allowing for precise filling of complex molds.
High Strength
PE products, especially HDPE molded products, have good strength and can withstand a certain degree of impact and pressure.
Weather Resistance
PE has good weather resistance, able to withstand sunlight, rain, and temperature changes without significant performance degradation.
Recyclability
Polyethylene is recyclable. At the end of its product life cycle, polyethylene products can be recycled and remanufactured into new products.
Commonly Used Polyethylene Material Grades
Polyethylene (PE) materials are classified according to their density, molecular structure, and production method. In addition to the grades listed below, we also use various types of industrial-grade polyethylene thermoplastic polymers, such as NSF grade polyethylene, food contact grade polyethylene, and medical-grade polyethylene materials.
Low-Density Polyethylene (LDPE)
LDPE represents low-density polyethylene, with a density of 0.91 to 0.94 g/cm³, and is a primary grade of polyethylene polymer. This material has high ductility, flowability, and chemical resistance, and can withstand alcohols, alkalis, and low-strength oxidizers.
Medium-Density Polyethylene (MDPE)
MDPE represents medium-density polyethylene, with a density of 0.926 to 0.960 g/cm³. It has good impact resistance and drop resistance, and compared to high-density polyethylene (HDPE), it has superior crack resistance and excellent sensitivity. Therefore, it is often used in pipe fittings, threaded supports, etc.
Linear Low-Density Polyethylene (LLDPE)
LLDPE is a type of polyethylene with a linear molecular structure. Compared to LDPE, it has higher strength and puncture resistance. It is commonly used in films, packaging bags, and linings.
High-Density Polyethylene
HDPE stands for High-Density Polyethylene. Its density ranges from 0.95 to over 0.97 g/cm³. It has high-temperature resistance exceeding 100°C. Its excellent chemical resistance and high mechanical strength make it an ideal material for injection molding.
Ultra-High Molecular Weight Polyethylene (UHMWPE)
UHMWPE stands for Ultra-High Molecular Weight Polyethylene. Its molecular weight density exceeds 0.95 g/cm³. This material is extremely tough and durable, thus exhibiting excellent abrasion resistance. It also has good processability, making it suitable for molded parts requiring dimensional accuracy.
Modified Polyethylene and Ethylene Copolymers
Modified polyethylene: Chlorinated polyethylene (CPE), cross-linked polyethylene (PEX)
Ethylene copolymers: Ethylene-propylene copolymer (plastics), EVA, ethylene-butene copolymer, ethylene-other olefins (such as octene POE, cyclic olefins) copolymer, ethylene-unsaturated ester copolymer (EAA, EMAA, EEA, EMA, EMMA, EMAH).
Specialty Thermoplastic and PE Material Sourcing Services
We offer a wide range of thermoplastic materials, serving numerous industries worldwide, with operations spanning international and regional markets. Elimold works directly with top-quality resin suppliers to provide customers with the thermoplastic materials they need at the lowest possible prices, ensuring optimal performance for their final products or subsystems. Our designers can help you determine if polyethylene is suitable for your custom injection-molded plastic parts or components, and if so, can help you find the most suitable grade for your application.
Partner With us for Comprehensive PE Injection Molding Services
As a professional PE injection molding company, we value personalized service, meticulous care, and efficient delivery, committed to simplifying your operations. We offer high-quality plastics, state-of-the-art production facilities, and expert support. Get a quote now.
One-stop PE Injection Molding Manufacturing Service
We possess a diversified technology platform and an innovative R&D team, enabling us to provide customers with a wide range of resins to meet the specific needs of various injection molding applications. Our world-class sales and marketing team, along with our experienced technical support team, assist customers with resin selection, process optimization, application development, part and mold design. Elimold also provides expert-level Design for Manufacturability (DFM) feedback throughout the entire process, as well as quotations and manufacturing guidance. Our injection molding experts understand the properties of various polyethylene plastics.
Customized PE (Polyethylene) Injection Molding Manufacturing Services
Explore our range of customized PE injection molding manufacturing services to gain in-depth guidance and expert solutions. Optimize your designs and boost efficiency today.
Custom PE Injection Molding Factory
Elimold is a leading supplier of custom plastic injection molding, producing billions of high-quality parts annually. Our in-house factory is equipped with over 125 injection molding machines, each with self-diagnostic and microprocessor-controlled capabilities, clamping forces ranging from 46 tons to 2200 tons, and capacities from fractional ounces to 1000 ounces. We also have a brand-new Class 8 cleanroom environment that can be tailored to the needs of different projects. To ensure optimal efficiency, we operate 24/7 for most of the year. Furthermore, Elimold’s plastic molding business incorporates various automation and robotic technologies, including custom fixtures, to improve efficiency, quality, and ergonomics.
Cleanroom PE Injection Molding Workshop
Elimold’s in-house factory also boasts world-class cleanroom molding capabilities, equipped with state-of-the-art cleanrooms that meet ISO Class 8 standards. This controlled environment minimizes airborne particulate matter and contaminants, ensuring your precision PE components are manufactured to the most stringent standards. This meticulous approach guarantees the integrity of the parts, thus ensuring the final product complies with regulatory requirements. Trust us to provide medical-grade PE plastic parts of unparalleled quality and precision.
Polyethylene Injection Molding Design and Engineering Capabilities
Elimold’s design engineering team has extensive experience in optimizing plastic part designs, balancing functionality, aesthetics, cost, and injection molding processes. As with other thermoplastics, maintaining uniform wall thickness in PE parts is crucial for achieving aesthetically pleasing molded components. Poorly designed stiffeners, gussets, and bosses can lead to shrinkage marks. Undercuts, commonly used for snap-fit connections, are prevalent in polyethylene moldings and, if properly sized, allow for easy removal from the mold. Consulting with Elimold’s engineering team ensures that the molded PE parts meet the design engineer’s expectations.
Advanced Tools and Engineering Solutions
At the heart of Elimold’s precision injection molding technology lies our unwavering pursuit of advanced molds and engineering techniques. We understand that the quality of PE injection molded parts depends on the quality of the mold itself. Therefore, we are committed to investing in the latest mold technologies and working closely with our customers to design molds that perfectly meet their specifications. This allows our talented team of injection mold engineers to design molds ranging from simple to extremely complex single-cavity, multi-cavity, and series molds. Depending on the complexity of the injection molded part, we can integrate various functions into the mold to ensure you achieve the look and function you desire.
Alternatives to PE Injection Molding: Use 3D Printing or Vacuum Casting Services
Let’s start with 1000 parts or less. While Elimold can create a lifetime production mold for you, optimize the relevant materials, and produce truly high-volume PE plastic parts or products using injection molding, in many cases you need small batches of test parts where precision and quantity requirements are not high. In these situations, 3D printing or vacuum casting is more suitable for rapid prototyping and low-volume parts.
Custom PE Plastic Parts: Injection Molding or Machining?
Understanding injection molding and when to apply it can significantly reduce costs. Small-batch and high-volume CNC machining of PE replacement parts is generally well-suited for injection molding. Elimold’s sales and engineering teams have extensive experience and expertise to help customers identify and evaluate which PE (Polyethylene) plastic parts and components are best suited for conversion from CNC machining to injection molding. This process involves analyzing the part’s geometry, function, material, and potential design changes to optimize the injection molding process.
FAQ
The geometry of the part, the number of parts required, your mold budget, and the application of the part will all influence your decision to use PE injection molding to manufacture the part.
Key factors to consider when designing polyethylene (PE) injection molded parts include material selection, wall thickness, and mold design. Choosing the appropriate polyethylene type (low-density polyethylene (LDPE) or high-density polyethylene (HDPE)) based on application requirements is crucial for obtaining the desired mechanical properties. Uniform wall thickness is essential to prevent warping and ensure consistent part quality. When designing the mold, a reasonable venting and gate layout is important to avoid air bubbles and ensure smooth material flow. Furthermore, considering the shrinkage rate of polyethylene and incorporating draft angles into the design helps the part demold easily and maintain dimensional accuracy.
PE plastic parts have low surface energy, making painting or bonding challenging, but adhesion can be improved through corona, flame, or plasma treatment.
Regular polyethylene will degrade under prolonged UV exposure, but UV-stabilized polyethylene is available for outdoor use.
PE generally has better impact resistance, especially at low temperatures, but PP has higher stiffness and heat resistance.
Absolutely. Recycled polyethylene can be used for many purposes; you just need to pay attention to its quality and perhaps slightly adjust the formulation for optimal results.
While PE isn't the hardest plastic, it's very tough and impact-resistant, making it ideal for parts that need to bend without breaking.
Depending on the specific application, the lifespan is generally 10 to 50 years.
Ready to Quote Your New Project?
Ready to use polyethylene in your next project? Contact Elimold today to discuss how polyethylene (PE) can enhance your product performance. Our experts will guide you through material selection and ensure your injection molding project meets all requirements.