Micro Molding
Micro molding is a plastic injection molding process for manufacturing extremely small, precision plastic parts. It uses miniaturized injection molding machines and mold tools to produce tiny plastic components with micro features, often with part weights less than 1 gram. Micro molding requires high precision tools and processes to achieve the necessary accuracy and detail for micro-scale parts.
  • Tolerance within ±0.0002 in (0.005mm)
  • Ability to define micro mold tool design requirements
  • Understanding material flow dynamics
  • Precise measurement systems
  • Proven mold design solution
  • ISO 9001: 2015, IATF 16949 certified
  • 24/7 engineering support
Our Micro Molding Process. Your Single-Source Partner.
from material selection to fully assembly
Micro Part Design Assistance
Micro Part Design
Micro Tooling
Micro Molding
Micro Metrology
Micro Assembly
Micro Molding Risk Control Plan
There are many factors for project manufacturing failure. Part structure, tooling tolerance control, mold design, and cost all play a key role in the success of the project.
Risk prevention is based on a complete understanding of the micromolding manufacturing process. There are many factors that affect micro-molding. Only by minimizing the risk at each stage of the molding process can the risk of overall failure be eliminated. These stages include:
  • Material selection and lot to lot variation
  • Proven mold design
  • Ultra precision mold
  • Metrology (mold & product size measure)
  • Precision Injection Machine
  • Micro Molding Process
Micro Molding Materials
At Attractive Plastics, in addition to providing a variety of conventional micro modlding materials, we also offer a variety of additive plastics to meet special requirements..
  • Regular Plastic Materials
  • Additives & Fibers Plastics
  • Mold Materials
Regular Micro Molding Plastic Materials
We offer a variety of micro molding plastics to meet your unique application.
Common micro molding plastic materials include: PP, ABS, PC, PMMA, Nylon, PE, PBT, POM, SAN, PS, LCP, PFA, PEEK, PPS, PEI, PPSU, PPA, PES.
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Additives & Fibers Plastics
Micro molding has no restrictions on materials or additives. To obtain a material with better mechanical properties, or to make it easier to molding or to prevent the plastic from breaking down, various additives and fillers can be added to the material to meet the desired requirements
Examples of common additives include:
  • UV absorbers
  • Flame retardants
  • Plasticizers
  • Carbon fibers
  • Antistatic additives
  • Glass fibers
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Mold Materials
Mold materials used for micro molding depend on the application's production volume, part complexity and material compatibility. The most commonly used mold materials include:
Mold Steel: P20, 718, 718H, 2738H, H13, S7, NAK80, S136, S136H
Stainless Steel: 420, NAK80, S136, 316L, 316, 301, 303, 304
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Why Choose Attractive Plastics for Micro Molding
Rich Micro Molding Experience
We have more than 20 years of successful experience in micro molding and strictly control every detail of manufacturing. From material selection, mold design and production, process control to machine selection.
Quality Assurance
We rely on advanced measuring equipment, as well as a skilled team of quality engineers, technicians and inspectors. We will take the careful measurements necessary for each project to ensure that you receive the highest quality components.
Strong Engineering Team
Our engineering team with over 20 years of experience provides strong professional knowledge and technical support in micro molding manufacturing. we will work closely with you to formulate a reliable molding plan.
Proven Mold Solutions
Our proven mold solutions are key to ensuring the success of micro molded parts and provide customers with a balance between quality, efficiency and cost.
Applications of Micro Molding
Micro molding enables the manufacture of small, complex plastic parts with high precision, it has many advantages such as material saving, light weight, and cost reduction, and is widely used in many industries, such as automotive, electronics, medical and aerospace, etc.
  • Electrical – Laser equipment, smartphones, lenses, prisms, connectors, switches, plugs, computer chips
  • Medical Devices – Drug delivery devices, diagnostic systems, catheters, optical and hearing aid components
  • Automotive – Components under the hood of cars, such as clips, washers, door lock mechanism components, various buttons, switches and microplastic gears, etc.
  • Aerospace – Valves, connectors and sensors
Micro Molding Design Tips/Considerations
Design tips/considerations
Mold design
Micro molding molds are very small, and special attention should be paid to mold design, from the feeding system to the molding system.
Mold material
The size of the mold core pin and ejection system of micro parts may be less than 1mm, which is very fragile. Therefore, special attention should be paid to the selection of mold insert materials.
Plastic material
Plastic raw materials are the first factor to consider for any micro-molded plastic parts and are also the key to the successful launch of the product.
Mold tolerance
Generally, micro molding plastic parts have extremely high tolerance requirements, so mold tolerances should be strictly controlled during mold making to avoid the cost of modifying the mold later.
Precision machine
Precision injection molding equipment is essential for micromolding, and super-precision injection molding machines are generally required. The smaller the parts, the smaller the tolerances, and the higher the precision requirements for the injection molding machine.
Mold process
The smaller the parts, the smaller the tolerances, the greater the challenge, the higher the process requirements, and even the surrounding humidity and temperature must be constant.
Leading Micro Molding Experts
From early DfX (Design for Excellence), DfM (Design for Manufacturability), and DfA (Design for Assembly) to high volume production, Attractive Plastics' Micro Molding has the capabilities and experience needed to successfully make your micro manufacturing project a reality. Follow our typical process here and see why we are a trusted partner and an industry leader.
1. Design for Manufacturing(DfM)
DfM starts with selecting the right material for the application. Factors such as flow and shear stresses are also taken into account, as well as environmental conditions related to humidity and temperature that affect microscopic tolerances. Part structure design, mold design, and assemblies are also extremely important.
Streamline Design
From the start of your project, our experts will carefully examine and eliminate any challenges that may hinder project production.
Faster to Success
We create proven solutions and contingency plans that save time and money and help resolve difficulties encountered during the development process.
Superior Quality
Advanced quality control methods and strict production processes ensure high-quality micro-molded plastic parts with tight tolerances.
2. Design for Excellence (DfX)
Our team follows strict guidelines throughout the micromanufacturing process to ensure your product meets all design requirements every step of the way. Every additional analysis we perform on your design ensures your product works exactly as expected.
Right the First Time
From concept to design, our team can solve a variety of micromolding challenges based on our extensive experience in tooling, molding and assembly.
Design Assistance
Based on usage intention, environment, etc., our experts conduct accurate evaluations of products and assist customers in designing each project.
Reduce Costs, Increase Value
An excellent design process can save customers time, money, accelerate time to market, and provide faster turnaround.
3. Design for Assembly (DfA)
Our engineering team assists all customers through DfA, ensuring the correct components and sub-assemblies are used to advance product designs while optimizing production and assembly costs.
Optimize Product Design
Automated assembly starts with part design. During the part design stage, the part structure is planned and optimized to prepare for later assembly.
Part Minimization
Meet the needs of many industries by reducing part size and lightweighting. This has obvious advantages in the automotive aerospace industry.
Cost effective
Smart assembly design reduces labor and creates a robust solution that requires less maintenance, saving money.
Gallery of Micro Molding Products
Over the years, Attractive Plastics has successfully supplied micro-molded components commonly used in surgical, implantable devices, automotive, aerospace, electronics and electrical applications.
Reviews from Our Customers
A customer’s words have a more substantial persuasion than a company’s claims. We have served hundreds of satisfied customers and here are some reviews they give us.
We were impressed with their micromolding capabilities. They work closely with us to optimize mold designs for high-precision fluidic components smaller than 1mm. After intensive prototyping, they achieved precise port geometry and tight tolerances, which were critical to the success of our project.
David Moon
Vice President
Design engineers are knowledgeable in injection molding and CNC machining, allowing them to efficiently integrate the production of mold cavities and core blocks. This simplified approach saved us weeks of mold preparation time.
Carl Harris
Pruchasing Manager
Their expertise in micromolding special polymer formulations allows us to produce prototypes with complex 25 micron features on MEMS sensors. Careful process testing and material selection ensure dimensional stability during solvent bonding.
Tony Jones
Their mold designers optimized the sprue and runner system, resulting in significantly less material waste and a 30% increase in part output compared to our previous supplier. The cost per part is low, so using their services can cost-effectively increase production.
Ben Holder
I admire their enthusiasm for sharing their technical know-how with their customers. We gain valuable insights from topics in materials science, process automation and quality that are applicable to our own operations. This will be very important for the success of many future projects. Thumbs up for their professionalism.
Anne Zaremba
Our Micro Molding Service for Various Industries
Our micro molding process is suitable for solve the various demands of industries, including the automotive, medical and electronic & electrical fields.
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Micro Molding FAQs

What is micro injection molding?

Micro molding, also know micromolding, micro injection modling, it is an specialized injection molding process capable of producing tiny plastic parts with high precision, tight tolerances, and excellent repeatability. It is used to manufacture extremely small components weighing less than 1 gram and measuring less than 3 millimeter in size. Micro molding requires specialized equipment like micro injection molding machines and is commonly used for medical devices, electronics, and other applications where small size, precision, and lightweight parts are critical.

What is the smallest microplastic parts you can make?

Micro plastic part size is primarily limited by gate size. Injection weight limits range from 0.1 grams to several grams, and part sizes usually range from 3-4mm. If you want to make micro plastic parts, please contact our engineers and we will provide targeted solutions.

What plastics can be used for micro molding?

Most conventional thermoplastics can be micro molding, but typically without the addition of glass fiber. Because micro molding gate is very small, the glass fiber may impede the flow of plastic and affect molding.

What is the lifespan of micro molding molds?

Depending on the order quantity, quenched and hardened steel can be used to make the mold. This can ensure that the life of the micro-molding mold is longer than that of conventional molds. You should choose different grades of mold materials according to the actual situation to meet your mold life.

What types of products are made by micromolding?

Because micro molding can save materials, meet the demand for lightweighting, and also save costs, it is favored by many industries, including automotive, aerospace, medical equipment, etc.

Are the product costs and mold costs of micro molding plastic parts expensive?

Generally speaking, micro-molded plastic parts require less raw materials and faster production cycles. Both the mold cost and the product price should be lower than the cost of conventional injection molding. However, if a specific plastic part has tight tolerance dimensional requirements and other requirements, this must be determined based on actual conditions.

Micro Molding Resources
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