Kunststof-Kemi was founded in 1974. In the beginning, small quantities of masterbatch were produced, as well as recycled plastic. The factory was located on the outskirts of Nykøbing Mors. The total area was 900 m2 and the production capacity was based on three smaller extruders.

In 1983 Kunststof-Kemi moved to larger facilities in Nykøbing. The new factory was 4000 m2.

In 1983, Kunststof-Kemi bought two Baker Perkins extruders. This resulted in better dispersion and higher quality.

In 1983-84, the first Single Pigment Dispersions (SPDs) were developed. It was 30-45% concentrates on PE and EVA basis.

These concentrates later became Ultrabatch. In the years to come, several new Ultrabatches were added and new carrier materials were introduced. The expanding range of well-dispersed Ultrabatch resulted in more consistent masterbatch production. The quality of these also improved and it was now possible to offer masterbatch to customers in the film and fibre industry.

In the spring of 1984, two more twin-screw extruders were purchased.

In 1993, Kunststof-Kemi was certified for the first time according to the ISO 9002 standard.

Slowly, the company grew and in the mid-1990s a new administration building, new laboratory facilities and a new production hall exclusively for Ultrabatch production were built. For the new production hall, 7 twin-screw extruders were purchased in Japan.

In 1996, Kunststof-Kemi bought a disused factory nearby. The factory is used as a warehouse for raw materials and finished products.

In 2003, Kunststof-Kemi was certified according to the ISO 9001:2008 standard.

In 2008, Kunststof-Kemi bought the first co-kneader extruder, a small 45 mm laboratory extruder. In the following years, more co-kneader extruders were purchased. The total number is now (2014) 15 of different sizes (45-140mm). For the new acquisitions, a new production hall was built and completed in September 2011. The majority of the co-kneader machines will be used for Ultrabatch production and new product development – including the development of new PVC concentrates.

In 2011, another closed factory was taken over. For the time being, it serves as storage.

In 2016, the total number of machines is 32 extruders and the total area is 32,000 m2.

In spring 2019, a second production hall will be inaugurated. This brings the total area to 34,000 m2 and the number of machines to 34 extruders.

In late 2022 a new warehouse with 1.100 m2 and two access ramps were buildt.

In 2023 a new heating system were installed. Old gas heating were replaced with modern heat pumps that uses excess heat from the production.