For more than a decade, the story of materials has been sold as a fight. Plastic against paper. Fossil polymers against bio-based upstarts. One winner, one loser. It makes for a clean headline. It bears almost no resemblance to how the industry actually works.

Spend an afternoon with the moulders, distributors and polymer specialists who turn raw pellets into finished products, and the binary falls apart inside the first conversation. These are not people paid to be romantic about materials. They run injection moulding machines that cost more than houses, and they judge everything that goes into them by one question: does it run?

That question has been central to the development of Notpla Rigid, our range of natural polymers designed to bring renewable materials into real-world manufacturing. Working alongside polymer distributors, manufacturers and injection moulders, we've spent years testing and refining these materials so they can work within existing manufacturing systems.

Because developing a new material is only the beginning. Getting it to run reliably on the machines already used by industry is where another kind of innovation starts.

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A material that didn't work

The honest place to start is with failure.

When Notpla first brought its seaweed-based polymers to Rob Stringer at Plastic Engineering Solutions, the results were blunt.

"Initial trials were unsuccessful."

For a moulder, an unsuccessful trial is not an abstraction. It is a stopped line, a scrapped batch, a machine that has to be stripped and cleaned.

What happened next is the part the industry rarely sees. Over several years, through what Stringer calls "perseverance and the dedication of your staff’ the material changed.

"We've seen Notpla go from materials we could not mould to blends which now regularly run well in production on standard injection moulding equipment."

That sentence carries more weight than any sustainability claim. It means the material earned its place on the machine.

Innovation rarely arrives as one breakthrough moment. More often, it comes from hundreds of conversations, shared expertise and incremental improvements that gradually turn promising materials into commercially viable products.

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What manufacturers actually need from new materials

Ask the people on the floor what a new material has to prove, and the environmental pitch is never the answer. It is the opening line, not the argument.

Performance matters.

So does scale.

Bruce McLaren of McLaren Plastics explains:

"Any new material has to prove it can scale, because most products simply can't function without high volumes and reliable supply."

Dan Jarvis at Plastribution adds the parts brochures skip: dependable supply chains, technical support and practical manufacturing alongside material innovation.

The lesson running underneath every conversation is that a material is only as good as the system it has to live in.

Daniel Kelk, Business Development Manager at Plastek UK, puts it in the language of the workshop. Because Notpla adapted its material to existing tooling and machinery, converters could utilise current assets without the need for major new investment.

"Notpla have been able to fit their material to existing tooling and machinery to make this conversion easy."

No new factory. No leap of faith. The seaweed had to fit the machine, not the other way round.

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The honest problem nobody wants to say out loud

Here is the idea that trade-show speeches tend to avoid.

"We cannot find a direct replacement for plastic that will tick all of the boxes, then disappear the moment you no longer need it."

It sounds obvious once said.

A material cannot be both indestructible in use and gone on command. Durability and disappearance pull in opposite directions.

The interesting work isn't chasing a miracle material that does everything. It's understanding which materials are best suited to which applications.

A takeaway food container and a car component are not the same problem. A dog chew and a computer keyboard are not the same problem.

Plastic remains one of the world's most important engineering materials. From healthcare and automotive to electronics and infrastructure, its performance has enabled countless innovations and continues to play an essential role across modern manufacturing.

Natural polymers have different strengths.

As Stringer puts it:

"In the right applications they can help with the littering problem... as the materials disappear more quickly."

Those words, "in the right applications", capture how we think about material innovation at Notpla.

The goal isn't to shrink the toolbox. It's to add a tool.

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Why natural polymers and traditional plastics can work together

The future of materials doesn't need to be framed as one material replacing another.

As Jarvis explains:

"It is also good to recognise that bio materials can work hand in hand with traditional materials in the plastics manufacturing sector."

That's why Notpla works closely with the plastics industry.

Bringing natural polymers into manufacturing requires the knowledge of people who understand polymers, tooling, injection moulding, production systems and supply chains.

Through collaboration with manufacturers, moulders and distributors, new materials can be tested against the realities of commercial manufacturing rather than developed in isolation from them.

Different applications require different materials.

The opportunity isn't to reduce choice. It's to expand it.

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The trust problem

One of the sharpest sessions at this year's Interplas was not about a material at all. It was about whether anyone believes what manufacturers say.

Dr Robin Kent's session on greenwashing explored a challenge facing businesses across the materials industry: how to communicate sustainability claims responsibly.

Narrow the claim until you can prove it. Define the boundaries. Build an evidence pack for every statement.

There is a quieter twin to that problem: greenhushing. Companies can become so concerned about being accused of greenwashing that they avoid communicating genuine progress altogether.

The way forward isn't better adjectives. It's credible, testable data that manufacturers and brands can stand behind.

Whether discussing recyclability, PFAS, carbon or bio-based content, that's increasingly what the market expects.

And it's how conversations around new materials should evolve.

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Skin in the game

So what happens next?

The experience of our manufacturing partners demonstrates the progress natural polymers can make when material development and manufacturing expertise come together.

Blends that once couldn't be moulded are now running on standard injection moulding equipment. Materials are being adapted to existing tooling and machinery. Manufacturers are building the knowledge needed to work with a broader range of materials.

But technical progress alone doesn't create a market.

As Kelk reflected:

"The next step now will be for brands to put skin in the game and commit to these sustainable options."

The future of materials won't be won by one substance beating another. It will be shaped by scientists, polymer specialists, manufacturers, distributors and brands working together, and by businesses choosing the right material for the right application.

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Frequently asked questions

What are natural polymers?

Natural polymers are materials derived from renewable biological sources, such as seaweed, cellulose and starch. They offer different performance characteristics to conventional polymers and aren't chemically modified. PLA, by contrast, uses modified starch.

Can natural polymers work with existing manufacturing systems?

Yes. As Notpla's manufacturing partners explain throughout this article, natural polymers can often be processed using existing tooling and machinery when the materials are developed collaboratively.

Can natural polymers be injection moulded?

Natural polymers can be developed for injection moulding applications. Notpla has worked with injection moulders and plastics industry partners to refine material blends that can run on standard injection moulding equipment.

Are natural polymers designed to replace plastic?

No. Different materials have different strengths. The aim is to expand the material toolkit available to designers and manufacturers, choosing the right material for the right application.

Why does Notpla work with the plastics industry?

Developing new materials requires collaboration. Notpla works with polymer distributors, manufacturers and brand owners to test, refine and scale natural materials for real-world manufacturing.

Working with the plastics industry also allows new materials to benefit from existing manufacturing expertise, tooling and infrastructure rather than requiring entirely new production systems.

What role will natural polymers play in the future?

Natural polymers are expected to become an increasingly important part of the wider material mix, particularly in applications where renewable materials offer clear functional or end-of-life benefits.

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Bringing natural materials into real-world manufacturing

Innovation doesn't happen in isolation.

Scientists, polymer specialists, manufacturers, distributors and brands all have different expertise to contribute. Bringing new materials into the market requires those perspectives to come together, not compete against one another.

That's the thinking behind Notpla Rigid.

Notpla Rigid brings natural polymers together with established manufacturing processes such as injection moulding, creating another material option for applications where its particular properties make sense.

Rather than asking whether plastic, paper or natural polymers should "win", we think there's a more useful question:

What's the right material for the job?

That's the future we're proud to be building alongside the UK plastics industry.

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Interested in learning more?

Whether you're exploring natural polymers, developing a new product or interested in working with Notpla Rigid, we'd love to start the conversation.

→ Learn more about Notpla Rigid

→ Contact our team