How OptiMIM incorporates sustainability into metal injection moulding

Sustainability in manufacturing is often associated with large-scale changes, but at OptiMIM, it is embedded directly in the details of the metal injection moulding (MIM) process itself. Insights shared by Senior Process Engineer Matthew Jones reveal how considered engineering decisions can reduce waste, eliminate hazardous materials and create more efficient outcomes, all without compromising performance or cost.

Reducing environmental impact through innovative MIM processes

Metal injection moulding is a process that combines fine metal powders with binders such as plastic and wax to create complex parts. These moulded "green parts" are then processed through several stages, including dewaxing, debinding and sintering, to achieve their final shape and material properties.

While this process is widely used across the industry, OptiMIM has re-engineered key stages to minimise environmental impact.

Eliminating hazardous solvents

One of the most significant sustainability advantages comes from OptiMIM's proprietary dewaxing process. Instead of using chemical solvents, which are common in the industry and present serious handling and disposal challenges, OptiMIM uses a thermal method to remove wax from parts.

This approach delivers two key benefits:

• No hazardous chemicals: Eliminating solvent use reduces environmental risk and improves workplace safety.
• Lower scrap rates: Solvent-based methods can damage parts, leading to scrap rates of around 10%. OptiMIM's process avoids this issue entirely.

By designing its own specialised ovens, OptiMIM has created a cleaner, more efficient alternative that aligns with strict environmental standards. These ovens are engineered specifically to support the thermal process, allowing precise temperature control and consistent wax removal without introducing contaminants or stressing the parts.

As a result, the process not only eliminates the need for hazardous solvents but also enhances overall production reliability. This level of control reduces variability, minimises defects and supports higher-quality output, reinforcing both the environmental and operational advantages of OptiMIM's approach.

Maximising resource recovery in the metal injection moulding process

OptiMIM extends its sustainability efforts beyond waste reduction by actively repurposing by-products into valuable resources. Its dewaxing process generates paraffin wax with a purity of 99.99%, which, while not yet reused at scale, offers potential for practical applications such as fire starters.

During the debinding phase, plastic binders are converted into hydrocarbon by-products that are captured rather than discarded. These materials are then blended with oil to produce a reusable fuel, ultimately sold for use as maritime bunker fuel. This approach not only reduces waste but also creates an additional value stream from existing processes.

Together, these practices reflect a circular approach that transforms process by-products into meaningful, usable outputs, reinforcing OptiMIM's commitment to both environmental responsibility and operational efficiency.

Controlled processing for consistent, cleaner results

The debinding and sintering stages are carefully optimised to ensure both efficiency and product quality. By precisely controlling temperature increases and gas flow, OptiMIM enables the effective breakdown of materials while minimising the risk of defects. This level of process control supports consistent outcomes and reduces the need for rework or scrap.

Equally notable is what is absent from the process. As one visitor reportedly observed during a facility tour, there are no chimney stacks. This absence underscores a broader commitment to reducing emissions and maintaining a cleaner manufacturing footprint, reinforcing OptiMIM's focus on environmentally responsible operations.

In-house material control for better performance and efficiency

Unlike many competitors who rely entirely on pre-made feedstock, OptiMIM formulates and produces about half of its own material in-house. This level of control allows the company to optimise the balance of metal, plastic and wax, improving not only performance but also process efficiency and waste reduction.

Sustainability without compromises

What makes OptiMIM's approach especially notable is that these environmental benefits do not come at the expense of quality or cost. In fact, the company's proprietary processes often result in improved material properties while maintaining competitive pricing.

This reinforces an important point: sustainability and performance can go hand in hand when innovation is built into the process.

Responsible manufacturing built into every process

These process-level innovations reflect OptiMIM's broader sustainability philosophy—one focused on reducing environmental impact, improving efficiency and responsibly managing resources across operations.

By eliminating hazardous chemicals, minimising waste and finding value in by-products, OptiMIM demonstrates how advanced manufacturing can support both business goals and environmental responsibility.