Environmental Sustainability in Injection Molding

What is the Environmental Impact of the Plastics Industry?

The plastics industry is vital to modern life but also comes with a significant environmental burden. In 2024, global plastics production generated millions of tons of CO₂e, mostly from sourcing raw materials and end-of-life management. At Rosti, we have measured our own footprint and found that 73% of emissions come from materials, 14% from energy, and 12% from operations like travel and packaging.

Understanding this empowers us to focus on making reductions where they matter most. By addressing emissions through design optimization, material substitution, energy sourcing, and operational improvements, we’re not just molding components—we’re helping create a more sustainable plastics industry.

Global Sustainability Trends and the Plastics Industry

All around the world, sustainability is changing the way plastics are made, used, and recovered. Several key forces are shaping the industry’s future:

• Circular Economy Adoption – Governments, NGOs, and industry groups are pushing to move beyond a “take-make-dispose” system. The Pew Charitable Trusts estimate that by 2040, circular solutions could cut plastic leakage into oceans by 80%.
• Policy and Regulation – Regulations like the EU Green Deal, Single-Use Plastics Directive, and Extended Producer Responsibility (EPR) laws now require companies to design for recyclability, report carbon data, and be accountable for their products after use. In the U.S., the SEC and state-level packaging rules are starting to emerge.
• Material Innovation – New technologies like biopolymers, chemically recycled resins, and mass-balance methods offer alternatives to virgin fossil-based plastics. These options are still scaling up, but are expected to become mainstream in the next decade.
• Consumer Demand and Brand Commitments – Surveys repeatedly show that consumers prefer products with sustainable packaging and transparent supply chains. Major global brands have set ambitious targets—for example, making all packaging recyclable or compostable by 2025.
• Transparency and Digitalization – Technologies like lifecycle assessments (LCAs), digital product passports, and supply chain traceability tools are enabling companies to more accurately measure and reduce their environmental impact.

These trends mean that sustainability isn’t optional anymore—it’s becoming the standard expectation across the plastics industry.

Companies like Rosti are part of this global push, working with customers to keep up with these trends. By validating recycled and renewable materials, testing designs for recyclability, and providing CO₂ data for better decision-making, we’re aligning our operations with the same forces shaping the whole industry.

Why is Sustainability Important in Plastic Injection Molding?

 Plastic injection molding is one of the world’s most widely used manufacturing processes, making everything from medical devices and food packaging to automotive and consumer goods. Because of its scale, it is also a key driver for advancing sustainability.

Why injection molding matters:

• Design determines impact. Studies show that over 80% of a product’s CO₂ footprint is set at the design stage. Choices like wall thickness, geometry, and assembly complexity determine long-term material use, energy needs, and recyclability.
• Material is destiny. The type of resin used directly affects the carbon footprint. Switching from virgin plastics to recycled or bio-based alternatives can significantly cut emissions—for example, using PCR ABS instead of virgin ABS can cut CO₂ by more than 50%.
• Scale amplifies outcomes. Even small gains in efficiency, like lightweighting by 5%, can lead to major carbon and cost savings across millions of molded parts.

Industry-wide implications:

This means injection molders have a unique responsibility—and opportunity—to help meet global sustainability goals. Their capability to design for recyclability, qualify new materials, and optimize production not only affects direct customers but also influences entire downstream industries.

Rosti’s role in the bigger picture:

As part of this global shift, Rosti:

• Validates and qualifies recycled and renewable materials through our Innovation Centers in Poland, China, and the U.S.
• Incorporates design for recyclability in customer projects to ensure products are compatible with circular systems.
• Uses lifecycle assessments and CO₂e data to help customers make informed decisions, instead of relying on assumptions.

By combining these efforts, injection molding goes beyond just making parts—it becomes a driver of measurable, system-wide sustainability outcomes.

Rosti’s Sustainability Strategy for Plastic Injection Molding

Rosti’s 2030 roadmap is built on six commitments:

Clean Energy – 100% clean energy across all locations.

• 2025: 86% clean energy (85% renewable, 1% nuclear)
• Transitioned Sweden operations from nuclear to 100% renewable.

Emission Reduction – Cut Scope 1 & 2 by 50%.

• 2024: Achieved 5% reduction from 2023 baseline
• Biggest lever: material and design collaboration with customers.

Green Materials – Always offer renewable/recycled alternatives.

• Database of 70+ green resins, 19 qualified, 8 in mass production
• Applications: food packaging (bio-based PE), appliances (PCR ABS), EV charging (mass-balanced PC).

Sustainable/Recyclable Design – Recyclable option for every customer.

• Life Cycle Analysis tools demonstrate design impact.
  Lightweighting and simplification cut footprint by up to 20–30%.

Energy Efficiency – 25% improvement by 2030.

• 2024 delivered a 4.9% improvement via waste elimination, process optimization, and intelligent power management. Site Energy Leaders and Communities of Practice drive ongoing progress.

Zero Waste to Landfill – All sites by 2030.

• 2023 baseline: 14% waste to landfill.
• Four sites have already achieved Zero Waste.
• Roadmap: 6 sites (2025), 8 sites (2027), 11 sites (2030).

These commitments ensure 100% of emissions sources are addressed, giving customers confidence that Rosti is a partner for the long run.

Pathways to Reducing Customers’ Carbon Footprint

Reducing the carbon footprint of plastics is one of the industry’s greatest challenges. Studies consistently show that most emissions come from three main sources: materials, energy, and design choices, with operational factors making up the rest. To make a real impact, manufacturers need to address all these areas—not just one.

Key levers for emissions reduction across the industry:

• Product Design – Optimizing shape, wall thickness, and part complexity can deliver immediate savings. Even small changes, like making packaging 10% lighter, can cut both resin use and transport emissions by double digits.
• Material Selection and Validation – Switching from virgin to recycled or bio-based polymers often has the single greatest impact on lifecycle emissions. Industry databases of approved resins are expanding, but ongoing testing and performance validation remain essential for adoption.
• Energy Sourcing and Efficiency – Moving from fossil-based power to renewables is the most straightforward way to reduce operational emissions. Combined with smarter factory systems, this decreases the energy intensity of molding.
• Operational Practices – From redesigning packaging and logistics to eliminating waste on the production floor, operational improvements can add up across global supply chains.

Rosti’s contribution within this framework:

• Design: We work hand-in-hand with customers on lightweighting and modularity, using lifecycle assessments to show potential CO₂ savings.
• Materials: Our Innovation Centers in Poland, China, and the U.S. rigorously test and approve PCR and biobased resins, with more than 70 materials in our database and 19 already qualified for production.
• Energy: In 2024, Rosti used 77 GWh of energy, 56% of which was from clean sources. Several locations already run on 100% renewables, moving us closer to our 2030 clean-energy target.
• Operations: We’re piloting initiatives like providing carbon footprint estimates along with price in customer quotes, helping purchasing teams make sustainability part of their decisions.

By aligning these actions with the same levers recognized throughout the plastics industry, Rosti makes sure our customers can see—and measure—real reductions in the carbon footprint of their products.

Collaborative Partnership for Sustainability in Injection Molding

Our greatest impact happens with customers, not for them. Collaboration means:

• Holding design workshops to explore low-carbon options.
• Providing carbon footprint comparisons between material and design alternatives.
• Sharing insights from cross-industry projects so customers benefit from proven solutions in other sectors.
• Acting as a preferred supplier for sustainable design, not just molding.

Example: For a leading appliance brand, Rosti validated PCR PP (95%) that is now used in mass production, proving recyclability while maintaining performance.

What is Sustainable Injection Molding Design?

Across the plastics industry, design is consistently identified as the single most powerful tool for reducing environmental impact. As stated above, research shows that over 80% of a product’s carbon footprint is determined at the design stage, before even one part is molded. Choices made at this point—about weight, shape, material, and assembly—can lock in decades of emissions or open up opportunities for circular solutions.

Best practices emerging across the industry include:

• Material Reduction – Using advanced engineering tools like finite element analysis to reduce wall thickness and weight without sacrificing strength. Lighter parts not only use less resin, but they also lower transportation emissions.
• Simplification – Designing components with fewer parts or connection points to make recycling and disassembly at end-of-life easier.
• Recyclability by Design – Selecting polymers and additives compatible with existing recycling streams and avoiding unnecessary multi-material mixes.
• Circularity Strategies – Designing products for reuse, remanufacturing, or integration into closed-loop systems to reduce the need for virgin plastic.
• Lifecycle Analysis (LCA) – Measuring environmental impacts from raw material extraction through production, use, and end-of-life, to ensure design choices are based on data, not assumptions.

How Rosti contributes:

Rosti incorporates these principles into customer projects by providing lifecycle analysis, validating new materials, and designing for recyclability. Our Sustainability and Innovation Centers in Europe, Asia, and North America offer tools to simulate, test, and prove sustainability benefits before production begins.

By aligning with these globally recognized design strategies, injection molding can move from contributing to environmental challenges to driving measurable, system-wide sustainability improvements.

Recycling of Plastic Scrap in Injection Molding

The goal is to achieve zero waste to landfill, and scrap recycling is a key strategy:

• Recovery & Reuse: Reintegrating in-process scrap into new parts without sacrificing quality.
• Circular Partnerships: Connecting customers with recyclers to close the loop.
• Innovation in Waste Handling: Separating waste streams, tracking yields, and maximizing recovery.

Operation Clean Sweep reinforces this by preventing resin pellet loss—installing steel mesh grids on drains, educating employees, and monitoring compliance.

EU and U.S. Sustainability Standards Impacting Plastics Manufacturing and Injection Molding

Across the plastics industry, regulations are evolving quickly, and manufacturers are under growing pressure to show sustainability in both product design and operations. These rules are changing how companies source materials, report emissions, and manage products at end-of-life.

Key regulatory drivers include:

• EU Green Deal & Corporate Sustainability Reporting Directive (CSRD): Companies operating in Europe must provide transparent carbon disclosures and integrate eco-design principles into their products.
• Microplastics Regulations: New rules, such as mandatory washing machine filters in the EU, are intended to cut down on microplastic release into the environment.
• Extended Producer Responsibility (EPR): Packaging and product manufacturers are more accountable for collecting, recycling, and disposing of products after they leave the factory.
• U.S. SEC Climate Disclosure Rules: Public companies are getting ready to report Scope 1–3 emissions, creating pressure throughout the supply chain for verifiable data.

For manufacturers, these frameworks mark an important change: sustainability is no longer optional—it’s now a compliance requirement.

Rosti factors regulatory requirements into material validation and design processes to ensure parts fit recycling systems, are supported by CO₂e data, and meet changing standards. By adopting these rules during design, we help customers meet current needs—and get ready for future ones.

Education and Training for Responsible Handling of Plastic Resins

Technology alone isn’t enough—people are what bring sustainability to life. Rosti invests in:

• Employee Training: Including resin handling, energy efficiency, and CO₂ reporting.
• Contractor Education: Making sure suppliers and partners meet our standards.
• Communities of Practice: Cross-site groups focused on energy efficiency, design for recyclability, and emissions reduction

This culture of learning ensures that sustainability is integrated into every role, from engineers to operators.

Positive Impact on Communities and the Environment

Across industries, sustainability is increasingly recognized as extending beyond just emissions and energy use. Companies are expected to contribute to the well-being of the communities where they operate, building trust and fostering shared responsibility for environmental and social outcomes.

Common approaches include:

• Education and Awareness – Partnering with schools, universities, and NGOs to promote environmental literacy and inspire future innovators.
• Local Initiatives – Supporting community programs focused on waste reduction, recycling, and circular economy practices at a grassroots level.
• Employee Engagement – Encouraging staff to participate in activities such as clean-up efforts, volunteer work, and sustainability awareness campaigns that build stronger community connections.

How Rosti contributes to this broader movement:

Rosti partners with regional schools and NGOs to raise awareness of sustainable practices, support recycling and waste reduction programs in our communities, and involve employees in initiatives that strengthen our culture of responsibility. These efforts complement our operational goals and reflect the growing expectation that manufacturers play a positive role not only in reducing their environmental footprint but also in supporting the communities where they work and live.

Environmental Initiatives Across Rosti’s Global Sites

Rosti’s global sites serve as testbeds for sustainability innovation:

• Poland, China, USA Innovation Centers: Testing and validating >70 green resins.
• Sweden (GIS): Transitioned from nuclear to 100% renewable energy in 2024.
• Germany (Dresden): Leading Zero Waste to Landfill efforts with successful pilot projects.
• Malaysia & Turkey: Expanding local recycling partnerships to manage regional scrap streams.

Each site has Sustainability Champions and Energy Leaders who drive ongoing progress and share best practices globally