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Custom Plastic Injection Molding

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Ultem Molded Parts

Very intricate PEI molding

Two station vertical insert molding

ABS moldings


Plastic injection molding provides tight tolerances and repeatability and is ideal for high volume production of plastic molded parts. Injection molded plastic parts can be manufactured using a wide range of thermoplastic polymers, resins and elastomers, making it an ideal and cost-effective process for various industries and applications. 

Stack Plastics specializes in custom plastic injection molding (or "moulding"). Injection molding is an efficient and cost-effective way to produce plastic parts in high volumes; with our precision injection molding capabilities, we can create thousands or millions of identical parts. From simple to complex designs for parts between 0.01 g and 10 oz., we deliver precision injection molding to match your unique specifications.


Innovative Plastic Injection Moulding Techniques

Plastic injection molded parts are created by pouring raw plastic resin into a hopper, then heating the resin and injecting it into a custom mold. Pressure is used accommodate shrinkage and once the plastic molded part has fully cooled, the mold is opened and the parts are removed. Because of the tight tolerances, plastic injection molding is a suitable option for both standard and intricate plastic molded parts of all sizes.

While the basic process of plastic injection moulding is relatively simple, involving only a handful of key elements, mastering the process at the level that Stack Plastics has is considerably more difficult. We think of our specific methods as "scientific molding"—we experiment with different variables and collect data that helps us optimize our injection molding processes. This helps us achieve maximum efficiency, provide superior quality custom plastic injection molded parts, and maintain perfect repeatability for parts in quantities in the millions.


Custom Plastic Injection Molding Capabilities

To tackle your most complex projects, we provide an array of specialized custom plastic molding techniques. Our custom plastic injection molding capabilities including:

  • Overmolding: involves combining two or more elastomer or plastic molded parts to fabricate a single component. This process can produce tight tolerances and is typically used to create soft-grip surfaces, improve ergonomics or create color contrast for aesthetics.
  • Insert molding: an injection molding process where elastomers, thermosets or thermoplastics are molded or formed around metal and other non-plastic parts.
  • Micro molding: a tight tolerance process used to create incredibly small plastic molded parts. This process is frequently used for the fabrication of intricate medical and surgical devices. 
  • and more


Design & Engineering Expertise for Your Custom Plastic Injection Molded Parts

With more than 20 years’ experience in plastic injection molding, we know what works and what doesn’t. We can provide design and engineering advice, as needed, to help make manufacturing our customers’ products faster, more efficient, and less expensive. We can review your design and advise certain changes that will allow us to produce your plastic injection molded parts or components more efficiently, more quickly, and with better quality, without sacrificing performance.

If no such changes are possible, Stack Plastics can add more levels to our quality inspection processes, to ensure that your injection molded parts will meet our high standards for quality, and yours.


We Offer Various Injection Molding Plastic Materials for Your Application

Various thermoplastic materials are used to manufacture custom plastic molded parts. We work with a wide variety of thermoplastic polymerselastomers, and resins to create the perfect injection molded parts for your needs. Our expertise with standard specialized materials and exotic resins enables us to produce plastic injection molded parts and components to match the precise specifications of any project. The injection molding plastics we work with most often include, among many others:

  • ABS provides high resistance to heat, chemicals and impact and has a tensile strength between 6,1000 and 6,500 psi. The excellent flow characteristics and high versatility of ABS makes it an ideal choice for plastic injection molding applications.
  • Polycarbonate is a strong thermoplastic polymer that has high stiffness and impact strength, and excellent strength retention at high temperatures.  It is easy to work with and can be used for a variety of plastic molded parts.
  • PEEK is highly versatile and is commonly used to replace metal. It provides high chemical resistance at elevated temperatures, withstands autoclave sterilization, and has high hardness, stiffness and strength.
  • Ultem is similar to PEEK but has lower impact strength and temperature properties. Despite this, it is one of the most dimensionally stable thermal plastics available and is highly resistant to environmental stress and cracking.


Contact Us for Custom Plastic Injection Molding

Stack Plastics are the injection molding experts. Request a quote to get started on your custom plastic molding project, or contact us to learn more about our injection molding capabilities.