Three plastic container of pure additives stabilizer sample for PP plastics with colored caps (light green, purple and white), each labeled with product information and weight of 1000 grams. The image is partly AI- GENERATED.

We develop tailor-made additives for reliable and highly performing recycling, bio-based and BHT free plastics.

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Plastics last longer and perform better when manufactured with the right additives. The right additives also improve your production without actually changing the processing conditions. Feedstocks of insufficient quality for your recycling plastics profit from matching additive selection too. This is why you should get to know our products and services!

We combine traditional and new, phenol-based, sterically hindered antioxidants that protect polymers against thermo-oxidative degradation with synergists* as efficiency enhancers.

Our additive systems** are tailorable to the demands of our customers and provide superior performance compared to conventional products. And we are able to stabilise without the use of phosphites. We are pure additives.

*the synergists are not classified as harmful in any way under the Globally Harmonized System of Classification and Labelling of Chemicals
**patented in the EU and other domains: US, CN, KR, JP, BR, MX, or DE

Our products

We offer tailor-made additives for polypropylenes (PP), polyethylenes (HDPE, LDPE, LLDPE), as well as polyamides or styrene recyclates like acrylonitrile butadiene styrene (ABS) and polystyrenes (PS) for our use-cases PERFORMANCE, BIO-BASED and BHT FREE.

A clear plastic container of pale additive powder labeled 'pure additives PP-01-C' - PERFORMANCE with a white screw-on lid, beside crumpled clear plastic wrapping and an icon for circular plastics. The image is partly AI- GENERATED.

PERFORMANCE

Stabilisers for Recycling Plastics

What if you could deal with metal contamination or gel formation without additional agents in your formulation and without turning your processing parameters upside down?

Product category
A clear plastic container of pale additive powder labeled 'pure additives PP-01-C' - BIO with a light green screw-on lid, beside a piece of sugar cane with a leaf and an icon with a shield and a leaf. The image is partly AI- GENERATED.

BIO-BASED

Stabilisers for true Bioplastics

As of today, most additives and stabilisers for plastics are based on petrochemical resources, which means, that “bioplastics” are usually not fully “bio”.

Product category
A clear plastic container of pale additive powder labeled 'pure additives PP-01-C' - BHT FREE with a purple screw-on lid, beside a medication blister with pills and an icon with a shield and pill inside. The image is partly AI- GENERATED.

BHT FREE

Stabilisers for contact sensitive applications

Migration and degradation of additives and ingredients is a particularly important issue for contact sensitive applications. 

Product category

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Our Mission

We develop antioxidant stabilisers for recycling plastics, bio-based plastics and contact sensitive applications. The stabilisers have been tested for a variety of polyolefin types, such as polypropylenes (PP), polyethylenes (HDPE, LDPE, LLDPE), as well as polyamides (PA6) or styrene recyclates like acrylonitrile butadiene styrene (ABS) and polystyrenes (PS). Testing included mechanical loads, multiple extrusion, and long-term stabilisation (thermo-oxidation and ageing/weathering). In addition, our stabilisers offer a BHT-free and Arvin-free alternative, addressing regulatory and consumer concerns associated with conventional additives. This makes them particularly suitable for sensitive applications such as food contact, packaging, and other end-uses where migration and toxicity restrictions apply.‍ ‍Skeptical? Then jump into our FAQs!

Who we are

Passionate about additives and always focused on developing solutions for the plastics of tomorrow.

From chemists to engineers and market specialists – our journey is shaped by a genuine passion for teamwork, lifelong learning, and the courage to take new paths together.

Behind our innovations is a group of committed individuals who value trust, integrity, and a supportive work atmosphere. Beyond skills and knowledge, we bring enthusiasm and a heartfelt desire to make a positive impact.

Zwei Menschen bei einer Preisverleihung, einer hält ein Zertifikat, im Hintergrund ein Bildschirm und ein Banner mit dem Text 'Chemstars' und einer Slogan."

Our Team

  • Dr. Christian Schütz

    CEO | The Business Builder

  • Dr. Katrin Markus

    CTO | The Additive Designer

  • Ein junger Mann mit Brille trägt einen dunkelblauen Anzug und ein hellblaues Hemd, steht vor einer modernen Wand mit vertikalen Linien, lächelt und blickt direkt in die Kamera.

    Dr. Tobias Kirschbaum

    CPO | The Future Materials Developer

  • Dr. Jannik Hallstein

    COO | The Production Perfectionist

  • You have already tried a number of stabilisers, but they do not get your product where you need it to be?

  • Your feedstock from which you produce your recyclate has particular impurities, which conventional stabilisers cannot deal with?

  • You are seeing variations or even drops in the performance of your materials which you cannot explain or remedy?

  • You would like to stabilise efficiently without the use of BHT-derivatives and without worrying about Arvin-products?

We would love the challenge! Let us know about your needs and we customise a product which is designed for YOUR benefit. Where others give up, pure additives is only getting started.

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Network

The success of our work is bolstered by an extensive network of research and industry collaborators. In addition to that, we deeply appreciate the insightful guidance of Prof. Dr. Rudolf Pfaendner and Dr. Elke Metzsch-Zilligen.