MOS Plastics:

Injection Molding in California

For over 50 years, MOS Plastics has been a trusted partner for top medical device and technology companies needing specialized injection molding services. Headquartered in San Jose, California, our state-of-the-art facility offers precision plastic molding capabilities tailored to the unique needs of the healthcare and technology sectors.

As a regional medical device contract manufacturing leader, we leverag650e our expertise in injection molding processes, cleanroom protocols, and quality systems to produce intricate components and finished devices. Our California location provides strategic access to Silicon Valley's vibrant innovation ecosystem while adhering to the state's strict manufacturing regulations.

At MOS Plastics, we understand the critical importance of location-specific capabilities. That's why our California facility is purpose-built to support medical device makers through specialized equipment, cleanrooms, and a passionate team committed to precision, quality, and service.

What is Injection Molding?

Injection molding is a versatile manufacturing process for producing parts and products from plastic and other materials. The molten material is injected into a mold cavity shaped like the desired part.

The first step is plasticizing, where plastic pellets are melted into a liquid state to be injected. The pellets are fed from a hopper into a heated barrel with a rotating screw inside. As the screw turns, heat and pressure melt the material, which is then forced through a nozzle into the mold.

Once the cavity is filled, the part cools and solidifies into its final shape. Gas-assisted, water-assisted, and insulated runner systems speed up cooling time so the mold can open faster. Then, the finished part gets ejected, and the mold closes, ready for the next cycle.

Thermoplastics like ABS, polycarbonate, polyethylene, and polypropylene are commonly used. Their molecular structure allows repeated melting for multiple production runs. Thermosets can also be injection molded through reaction injection molding.

The real advantage of injection molding is producing intricate, detailed parts with precision. Complex 3D geometries like threads, slots, and holes that might require drilling or machining can easily be molded. It also offers exceptional repeatability and efficiency, ideal for mass production.

About Our California Injection Molding Facility

Our 55,000-square-foot manufacturing facility in San Jose, California, is specially equipped for precision injection molding of medical devices and diagnostic components. With 30 molding machines from 28 to 500 tons, we can handle small, intricate parts and larger components and housings.

We maintain full ISO 13485 certification and registration with the FDA for compliance with the strictest medical device manufacturing regulations. Our specialized infrastructure includes:

  • 4,500 sq ft tool room for rapid prototyping and mold maintenance
  • Fully equipped metrology labs for comprehensive quality testing
  • 2 ISO Class 7 cleanrooms (rated ISO Class 10,000)
  • Custom-designed cleanroom molding work cells

Our cleanroom injection molding environment provides extremely low particulate levels, which is critical for manufacturing implantable devices, surgical instruments, IVD components, and drug delivery systems. We can meet the tight tolerances and validations required for Class III and II medical hardware.

Our expertise in medical molding processes and a meticulous quality system enable us to produce millions of components annually for industry-leading medical OEMs.

MOS Plastics and California’s Business Environment

California offers an unparalleled environment for advanced manufacturing, making it the ideal location for our specialized medical device injection molding. The state leads the nation in innovation with a powerful combination of talent, academic research, investment capital, and supportive infrastructure.

Silicon Valley, in particular, serves as a global hub for technology and life sciences. Its entrepreneurial culture, proximity to Stanford and UC Berkeley, and density of STEM professionals catalyze breakthrough ideas into thriving businesses. As a contract manufacturer, we’re proud to enable innovators to bring life-changing technologies to market.

Our strategic base in San Jose has allowed us to leverage California’s unique assets. Our partnerships with local medical device startups and multinationals contribute to the region’s robust medtech cluster. We also tap into the area’s highly skilled workforce to maintain our competitive edge by continuously advancing precision molding capabilities.

By aligning our specialized services and equipment investments to support California’s medtech innovation pipeline, we can fulfill our mission of simplifying the path to market for partners focused on improving patient outcomes through precision plastic solutions.

Our Services

MOS Plastics provides a comprehensive range of injection molding and secondary services for medical device manufacturing at our California facility.

Precision Injection Molding

Our precision plastic molding capabilities produce intricate components for surgical instruments, drug delivery devices, diagnostic equipment, and implantable products. We specialize in tight-tolerance molding for small, complex geometries.

Secondary Operations

We offer in-house secondary services like pad printing, laser marking, cleanroom assembly, ultrasonic welding, leak testing, metrology, and more. These services simplify supply chains by packaging products and making them sterilization-ready.

Cleanroom Molding

Our ISO Class 7 cleanrooms allow particulate-controlled manufacturing of implants, IVD consumables, and components involving reagents/chemicals per ISO standards.

Prototyping & Low-Volume

On-site rapid prototyping and low-volume production facilitate design verification builds, clinical evaluations, and pilot manufacturing.

Program Management

Our program managers oversee projects end-to-end, serving as a single point of contact for planning, updates, change control, and post-launch support.

Our Specialized Infrastructure and Equipment

At MOS Plastics, we pride ourselves on our state-of-the-art infrastructure and cutting-edge equipment, which enable us to deliver high-quality injection molding solutions for our clients. Our California facility is equipped with the latest technologies and machinery to ensure precision, consistency, and efficiency in every project we undertake.

By continually investing in the latest infrastructure and equipment, MOS Plastics ensures that our California facility remains at the forefront of injection molding technology. This dedication to innovation allows us to deliver superior-quality products and services to our clients, particularly those in the medical and diagnostic device industries.

Quality Assurance is Our Top Priority

At MOS Plastics, quality is integral to every program. Our California operation upholds the highest standards for medical device manufacturing, maintaining ISO 13485 certification and registration with the FDA.

We incorporate quality assurance throughout the entire product lifecycle – from design and validation to production and post-market surveillance. Our quality engineers collaborate cross-functionally to ensure compliance at every step.

Customized protocols include installation qualifications (IQ), operational qualifications (OQ), performance qualifications (PQ), and process validations per ISO 13485. We also offer complete traceability and change control for transparent record-keeping.

Our metrology labs employ advanced measurement equipment for dimensional inspection and functional testing. We conduct comprehensive evaluations on molded parts and finished device assemblies using optical comparators, vision systems, and coordinate measuring machines.

We uphold strict procedural and documentation discipline by integrating robust quality processes with ongoing training. Our obsession with quality and process control helps reduce risks for our medical device partners so they can focus on patient outcomes.

Why Choose MOS Plastics for Injection Molding in California?

Regarding injection molding in California, MOS Plastics is the premier choice for businesses seeking excellence, reliability, and innovation. Our state-of-the-art facility in San Jose offers a comprehensive range of services and capabilities designed to meet the unique needs of our clients, particularly those in the medical and diagnostic device sector.

Partnering with MOS Plastics offers several key benefits for clients in the medical and diagnostic device sector:

  • Cleanroom Manufacturing: Our cleanroom manufacturing capabilities ensure the highest cleanliness and quality standards for your products.
  • Expertise in Medical-grade Materials: We possess extensive expertise in working with medical-grade materials and ensuring compliance with regulatory standards.
  • Commitment to Quality: Our unwavering commitment to quality ensures that your products are consistently produced to the highest standards.

We understand that entrusting your product to an external manufacturer can be daunting. That’s why, at MOS Plastics, we strive to address our clients’ concerns by fostering a culture of transparency, communication, and collaboration.

Our approach includes:

  • Transparency: We maintain transparent communication channels throughout manufacturing, providing regular updates.
  • Collaboration: Our dedicated project management team works closely with you to ensure your project stays on track.
  • Confidentiality: We prioritize the protection of your intellectual property and maintain strict confidentiality standards to safeguard your sensitive information.

Choosing MOS Plastics for your injection molding needs in California means partnering with a company that combines technical expertise, state-of-the-art facilities, and a deep understanding of the medical and diagnostic device industry. With our unwavering commitment to quality, innovation, and customer satisfaction, we are the ideal partner to help bring your vision to life.

Partner with MOS Plastics

MOS Plastics has delivered manufacturing excellence for leading medical device innovators. Our strategic focus and continued infrastructure investments make us California’s trusted specialty provider for precision plastic solutions.

We invite you to explore how our capabilities can provide value throughout your product development and commercialization journey. Our expertise, quality systems, and passion for client success have positioned us as an extension of our partners’ teams.

To discuss your specific project needs or request a quote for injection molded components, please reach out to our knowledgeable staff.

Contact us by:

  • Phone: (408) 944-9407
  • Email:

Ready to simplify your path to market? Let’s connect. Our application engineers and program managers look forward to learning about your next-generation medical technologies and delivering exceptional precision plastic solutions.

FAQ About Our California Plastic Injection Molding Services

What makes MOS Plastics a leader in medical and diagnostic device injection molding?

MOS Plastics is a top-tier, preferred supplier for respected medical device and technology companies. We specialize in insert molding within class 7 and 8 cleanrooms, producing millions of Point of Care consumables and surgical devices annually. Our expertise, certifications, and state-of-the-art facilities make us uniquely qualified to serve the stringent requirements of the medical and diagnostic device industries.

What certifications and compliance standards does MOS Plastics maintain at its California facility?

MOS Plastics is ISO 13485 certified for medical device manufacturing, and FDA registered. Our California facility features Class 7 (10k) cleanrooms that are controlled and audited to ensure the cleanliness of molded parts. We also maintain ISO 9001 certification for quality management systems.

What capabilities does MOS Plastics’ San Jose facility offer?

Our 55,000 sq. ft San Jose facility houses 35 injection molding machines, Class 7 cleanrooms, a white room, and a dry room. The facility provides a controlled, particulate-free manufacturing environment suitable for producing Class IV medical devices, surgical instruments, drug delivery systems, and diagnostic kit components.

How does MOS Plastics ensure quality in its injection molding processes?

Quality assurance is integral to every client program at MOS Plastics. We employ rigorous quality control measures such as in-process inspections, statistical process control, and final inspections. Our fully equipped quality lab conducts dimensional verification, material analysis, and functional testing. We maintain detailed traceability and documentation, and our employees undergo regular training to uphold our high-quality standards.

What additional services does MOS Plastics provide beyond injection molding?

MOS Plastics offers a full range of services to support your product throughout its lifecycle. These include design support, rapid prototyping, tooling, full-scale production, cleanroom assembly, packaging, and sterilization. We aim to be a comprehensive solution partner for our client’s medical and diagnostic device manufacturing needs.

How does MOS Plastics protect client intellectual property and confidentiality?

We understand the importance of safeguarding our clients’ sensitive information. MOS Plastics has strict policies and procedures in place to protect intellectual property and maintain confidentiality. We enforce non-disclosure agreements, provide secure data storage and transmission, and limit access to client information on a need-to-know basis.

What sets MOS Plastics apart from other injection molding companies in California?

MOS Plastics combines deep expertise in medical and diagnostic device manufacturing with state-of-the-art facilities, advanced technologies, and a commitment to quality and innovation. Our San Jose location in the heart of Silicon Valley provides access to world-class talent, suppliers, and resources. We foster long-term partnerships with our clients, offering personalized support and adapting to their evolving needs. With decades of experience and a dedication to excellence, MOS Plastics is the premier choice for injection molding in California.