What tolerances can be achieved?

With tight process control and high-precision tooling, moulded component tolerances of 0.01mm could be achieved. This again depends on the design of the part and polymer used.

What is the lifespan of a mould tool?

The lifespan of a mould will depend on the material selected and the number of parts to be produced. If the mould tool is design correctly, it should give many years ‘service.

How long does it take to produce a mould tool?

Mould tools are an essential part of the injection moulding process, the design of which is crucial to a successful project. Rosti are experts in the tooling design DFM process. The lead time for manufacturing mould tools is dependent on many factors, including the complexity of the part, cavitation and polymer selection. Typically, a mould tool will take 8-10 weeks to manufacture.

Choosing the right thermoplastic and mould tool?

Selecting the appropriate resin and mould tool during the early stages of product development is critical to ensuring efficiency, performance, and cost-effectiveness in plastic part production. Collaborating closely with Rosti on your injection moulding during the design-for-manufacturability (DFM) phase can help streamline the process and ensure successful outcomes.

What is a plastic injection moulding manufacturer?

A plastic injection moulding manufacturer is a company that produces precise plastic components for a variety of industries, such as automotive, medical, packaging, domestic appliances, and industrial applications. They work with different plastics and advanced processes, including multi-material and overmoulding techniques, to create parts that meet high standards for quality, performance, and functionality. Manufacturers like Rosti handle the entire process: from design support and material selection, to tooling development, trial samples, production, and quality control, ensuring components are reliable, consistent, and ready for assembly or further processing.

What are the benefits of plastic injection moulding?

Our injection moulding services offer: <ul class="wp-block-list"> <li>High efficiency for plastic part production</li> <li>Excellent repeatability and dimensional accuracy</li> <li>Cost-effective scaling for high-volume plastic part production</li> <li>Compatibility with complex geometries</li> <li>A wide range of thermoplastic moulding options</li> <li>Low material waste and fast cycle times</li> </ul>

What materials are used in injection moulding?

We process a wide range of injection moulding materials to suit various functional and aesthetic requirements. Common thermoplastics include: <ul class="wp-block-list"> <li>ABS</li> <li>Polypropylene (PP)</li> <li>Polyethylene (PE)</li> <li>Polystyrene (PS)</li> <li>Nylon (PA)</li> <li>Polycarbonate (PC)</li> <li>POM (Acetal)</li> </ul> We also support applications requiring specialty resins, glass-filled compounds, flame-retardant grades, and medical- or food-grade plastics. Our injection moulding services offer: <ul class="wp-block-list"> <li>High efficiency for plastic part production</li> <li>Excellent repeatability and dimensional accuracy</li> <li>Cost-effective scaling for high-volume plastic part production</li> <li>Compatibility with complex geometries</li> <li>A wide range of thermoplastic moulding options</li> <li>Low material waste and fast cycle times</li> </ul>

What is plastic injection moulding?

Plastic injection moulding is a high-precision manufacturing process used for the mass production of custom plastic components. It involves injecting molten thermoplastic material into a mould tool, where it cools and solidifies into the final part. This process is ideal for creating detailed, repeatable parts at scale. Plastic components play a critical role across nearly every industry—from automotive and medical, packaging, plumbing, industrial equipment, and agriculture. Today’s plastic components are becoming increasingly intricate, often requiring advanced materials with specialised properties—such as high-temperature resistance or the use of engineered or exotic resins—to meet performance and durability demands. By leveraging advanced plastic injection moulding technologies and modern production methods, Rosti can deliver high-quality plastic parts with exceptional precision, consistency, and efficiency in a sustainable way.

Rosti

Plastic Injection Molding

Why Choose Rosti for Plastic Injection Molding Services?

At Rosti, we combine over 80 years of experience as a plastic injection molding company with the latest technology. This allows us to deliver precise solutions for industries such as medical, automotive, and consumer electronics. With ISO-certified facilities in Europe, North America, and Asia, we deliver high-quality, environmentally responsible production in line with the EU’s CSRD. From rapid prototyping to large-scale manufacturing, Rosti provides flexible, sustainable, and reliable plastic injection molding services tailored to your needs.

Mark Wrigley
VP Sales Europe

Solutions for Your Industry

Our plastic injection molding solutions are trusted across a wide range of sectors that require high-performance, reliable polymer components.

Automotive

Precision interior and exterior components, functional connectors, and lightweight structural elements designed to meet strict automotive standards.

Medical

Biocompatible parts, disposable instruments, and components suitable for cleanroom environments, supporting patient safety and regulatory compliance.

Packaging

Durable, lightweight packaging components, closures, and containers optimized for functionality, protection, and visual appeal.

Home Appliances

High-quality housings, functional parts, and ergonomic components for appliances, combining durability, design, and user-friendly performance.

Industrial Applications

Rugged housings, protective covers, and mechanically resilient parts engineered to withstand demanding operational environments.

500 Plastic Injection Molding Machines at Thirteen Locations

At Rosti, we operate over 500 advanced injection molding presses across nine countries, giving us the flexibility to manage projects of all sizes efficiently and effectively. Each year, we produce millions of high-quality plastic parts—from small, simple components to large, complex assemblies—reflecting our commitment to excellence.

We also work with a network of over 50 experienced toolmakers across nine countries, ensuring the right tool for every project. Whether it’s a simple single-cavity mold or a complex 72-cavity tool, we deliver top-quality results with cost-effectiveness in mind.

What Is a Plastic Injection Molding Company?

A leading plastic injection molding company specializes in transforming innovative designs into components at scale. Comprehensive, end-to-end capabilities extend beyond traditional molding. The company works closely with customers from concept to completion, often offering:

Product design and engineering – Optimizing plastic part designs for efficiency, manufacturability, and cost-effectiveness.
Tool design and manufacturing – Developing precision steel or aluminum molds for plastic components using advanced engineering and automation.
Material expertise – Selecting the right polymers to meet mechanical, aesthetic, and sustainability requirements.
Production and process optimization – Operating state-of-the-art injection molding machines for reliable, high-volume plastic production.
Value-added services – Including assembly, decoration, surface finishing, and rigorous quality control for plastic parts.

Plastic Injection Molding Products

At Rosti, we specialize in delivering high-precision plastic injection molding products tailored to meet the diverse needs of industries such as medical, automotive, consumer goods, and industrial applications. Our extensive capabilities encompass a wide range of manufacturing processes, ensuring that we can produce components that meet the highest standards of quality and performance.

In addition to traditional plastic injection molding, we offer a variety of injection molding techniques to accommodate different product requirements:

Traditional plastic injection molding

Multi-shot injection molding services

In-mold decoration (IMD) and in-mold labeling (IML)

Liquid silicone rubber (LSR) molding process

Overmolding and insert molding process

Surface Finishing

Injection blow molding process

Metal to plastic conversion

Sustainability in Every Step Solutions

Sustainability is part of everything we do – from product design to manufacturing to the finished product. We recognize both our responsibility and opportunity to make a positive environmental impact across the plastics industry. We design products with sustainability in mind, select the right materials, optimize processes, and reduce waste, influencing the entire value chain from raw materials to end-of-life solutions. Across our global operations, we implement energy-efficient machinery, recycling programs, lightweight and repairable designs, and the use of bio-based or recycled materials. By working closely with our customers and partners, we support a circular economy and help create a more sustainable future. Sustainability isn’t just a goal – it guides every step we take.

Unparalleled Manufacturing Support & Customer Satisfaction

Our commitment to excellence at Rosti goes beyond manufacturing—we provide comprehensive manufacturing support to help ensure our customers’ success. We offer engineering and design support, a digital innovation lab, and educational initiatives to keep customers up to date with the latest technologies. Our customer care centers prioritize customer satisfaction, and our use of digital simulation and material selection expertise helps optimize product performance. Our well-defined processes, production transfer capabilities, and unwavering commitment to quality make Rosti a reliable partner for businesses seeking manufacturing support.

Our commitment to excellence at Rosti goes beyond manufacturing—we provide
comprehensive manufacturing support

Specialized Solutions for the Medical Industry

Rosti stands out with our dedicated offerings tailored to meet the unique needs of the medical market. We provide clean room production capabilities, ensuring a controlled environment that meets medical standards. Our accreditations in this field demonstrate our commitment to excellence, and our case studies showcase our ability to tackle complex projects. Partnering with Rosti means businesses in the medical industry can rely on a manufacturer for medical devices who deeply understands their specific requirements and challenges.

Leverage the Benefits of a Global Provider

Rosti’s global presence gives customers the unique advantage of partnering with a provider that has an extensive international network and a deep understanding of diverse markets. By working with Rosti, customers get access to resources, expertise, and capabilities that span the globe, ensuring consistent quality and seamless collaboration. Trust us as your partner in injection molding for innovative, reliable, and globally integrated manufacturing solutions.

FAQ

Can recycled or sustainable plastics be used?
What tolerances can be achieved?
What is the lifespan of a mould tool?
How long does it take to produce a mould tool?

Mould tools are an essential part of the injection moulding process, the design of which is crucial to a successful project. Rosti are experts in the tooling design DFM process. The lead time for manufacturing mould tools is dependent on many factors, including the complexity of the part, cavitation and polymer selection. Typically, a mould tool will take 8-10 weeks to manufacture.
Choosing the right thermoplastic and mould tool?

Selecting the appropriate resin and mould tool during the early stages of product development is critical to ensuring efficiency, performance, and cost-effectiveness in plastic part production. Collaborating closely with Rosti on your injection moulding during the design-for-manufacturability (DFM) phase can help streamline the process and ensure successful outcomes.
What is a plastic injection moulding manufacturer?

A plastic injection moulding manufacturer is a company that produces precise plastic components for a variety of industries, such as automotive, medical, packaging, domestic appliances, and industrial applications. They work with different plastics and advanced processes, including multi-material and overmoulding techniques, to create parts that meet high standards for quality, performance, and functionality.

Manufacturers like Rosti handle the entire process: from design support and material selection, to tooling development, trial samples, production, and quality control, ensuring components are reliable, consistent, and ready for assembly or further processing.
What are the benefits of plastic injection moulding?
Our injection moulding services offer:
- High efficiency for plastic part production
- Excellent repeatability and dimensional accuracy
- Cost-effective scaling for high-volume plastic part production
- Compatibility with complex geometries
- A wide range of thermoplastic moulding options
- Low material waste and fast cycle times
What materials are used in injection moulding?
We process a wide range of injection moulding materials to suit various functional and aesthetic requirements. Common thermoplastics include:
- ABS
- Polypropylene (PP)
- Polyethylene (PE)
- Polystyrene (PS)
- Nylon (PA)
- Polycarbonate (PC)
- POM (Acetal)
We also support applications requiring specialty resins, glass-filled compounds, flame-retardant grades, and medical- or food-grade plastics.

Our injection moulding services offer:
- High efficiency for plastic part production
- Excellent repeatability and dimensional accuracy
- Cost-effective scaling for high-volume plastic part production
- Compatibility with complex geometries
- A wide range of thermoplastic moulding options
- Low material waste and fast cycle times
What is plastic injection moulding?

Plastic injection moulding is a high-precision manufacturing process used for the mass production of custom plastic components. It involves injecting molten thermoplastic material into a mould tool, where it cools and solidifies into the final part. This process is ideal for creating detailed, repeatable parts at scale.

Plastic components play a critical role across nearly every industry—from automotive and medical, packaging, plumbing, industrial equipment, and agriculture. Today’s plastic components are becoming increasingly intricate, often requiring advanced materials with specialised properties—such as high-temperature resistance or the use of engineered or exotic resins—to meet performance and durability demands.

By leveraging advanced plastic injection moulding technologies and modern production methods, Rosti can deliver high-quality plastic parts with exceptional precision, consistency, and efficiency in a sustainable way.

Can recycled or sustainable plastics be used?

Yes. We offer solutions for using recycled or bio-based materials when project specifications allow. Many thermoplastic moulding materials can be reprocessed without compromising quality.