Custom Plastic Injection Molding

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Stack Plastics is an ISO 13485:2016 certified  plastic molding company with more than 20 years’ experience in custom plastic injection molding for industries including aerospace, medical and consumer products.

We offer expert service throughout the entire development process of your plastic injection molded products, from conception to prototyping to mass production. Stack Plastics also provides a wide variety of custom plastic molding services and secondary services to give you the best quality products and the best customer service around.

Comprehensive Plastic Injection Molding Capabilities

Based in the Bay Area of California and serving customers across the U.S., we specialize in plastic injection molding for medical device components, but also supply parts, components, and assemblies for applications ranging from consumer products to aerospace components.

Stack Plastics can produce prototypes, short-run development parts, and full production runs with quantities in the millions. From the simplest designs to the most complex, we can deliver high quality, high precision plastic molded parts for any project. Our plastic injection molding and production services are completely customizable to the needs of your project, to ensure that the end products you receive meet your exact specifications.

Plastic Molding for Thermoplastics and Other Materials

Stack Plastics provides plastic molding using thermoplastics, elastomers, and exotic resins, including PEEKDelrin®, and more.

What Our Customers Say About Plastic Molding Services from Stack Plastics

“Our R&D Engineering has been dealing with Stack plastics injection molding and overmolding needs. Their engineering staff has been able to address all of our concerns with respect to: design, materials, process, quality, quoting, delivery times. When you are fighting time constraints it is nice to know there are vendors that are concerned with the bottom line - cost, quality & delivery…” 

Review from Dogwood via VendOp


“Stack Plastics is the vendor we used in our company for their products that helps our devices in assembly. The quality of their products makes their reputation for special parts that we are using for a prototype that we needed. We don't have known issues with them. The service and products are reliable and effective that is competitive to other vendors. Pricing is great for it is low cost and the delivery are on time. Overall this vendor deserves to be recommended for anyone!”

Review from IMLaw via VendOp


“We reached out to stack plastics to help us create some plastic part and components to fit our medical devices. They were able to make it as both subassemblies as well as other components for our more complex medical devices…We were very pleased with our experience with stacks as they kept us informed throughout the entire process and allowed us to make changes to our parts even after the production process began.”

Review from Bill via VendOp


Contact us for Custom Plastic Injection Molding & More

Contact Stack Plastics for a quote on your custom plastic injection molding project. Whether you’re in California or across the country, we’re ready to put our experience and capabilities to work for you.

Stack Plastics Provides Plastic Injection Molding for Aerospace and Other Industries

Medical Plastic Molding

With years of experience and advanced injection molding capabilities, Stack Plastics can deliver high precision, tight tolerance parts for the medical device industry. Using micro molding, insert molding, and other processes, will can provide the ideal injection molding solution for your needs. We work with a range of thermoplastics and are ISO 13485 certified for medical device component manufacturing.

Aerospace Plastic Molding

Few industries require greater precision or tighter dimensional tolerances than aerospace. Stack Plastics uses proven plastic injection molding techniques and state-of-the-art technology to produce precision molded aerospace parts and components that match our customers’ exact designs, with perfect repeatability from the first piece to the last.

Consumer Plastic Molding

From level sensor floats to wine bottle openers and beyond, Stack Plastics has the plastic molding capabilities to produce a broad range of consumer products. We utilize a variety of molding processes and thermoplastic materials and resins to create custom molded parts, components, and complete products for customers in all consumer markets.