Polyethylene – basic knowledge

Polyethylene is produced in both high and low density. This creates a suitable material for every application. The LDPE, HDPE and LLDPE polyethylene types are used to 90%.

LDPE – low density polyethylene

LDPE is produced using a high-pressure process at a pressure of 1,000-3,000 bar and temperatures of 150-300°C.

This standard material that we use is relatively soft and easy to process. The end products are very puncture-resistant and elastic. Mixed with LLDPE, the bags are sometimes even more puncture-resistant. This also improves the weld seam strength.

HDPE – high density polyethylene

HDPE is produced in a low-pressure process at a pressure of 1-50 bar and temperatures of 20-150°C. 

It is more puncture resistant than LDPE, but tears more easily. Due to its material properties, HDPE can be produced in lower thickness than LDPE. For certain applications, HDPE is therefore a favourable alternative.

LLDPE – linear low density polyethylene

LLDPE is produced at a slightly increased pressure of 50-100 bar and using a modified catalyst. It is extremely stretchable and is used in particular for the production of stretch films.

MDPE – medium density polyethylene

The material is very similar to HDPE, but with reduced density. It is softer to the touch than HDPE, but only marginally less strong.


Metallocene is a catalyst used in the processing of ethylene that significantly improves the properties of polyethylene. Colloquially, the name metallocene also stands for types of plastic that were produced with the help of this catalyst.

NT goods

In the production of polyethylene, it sometimes happens that the product does not exactly meet the manufacturer's usual specifications. This PE is then designated as non-type (NT) goods and traded at cheaper prices on the spot market. The quality of NT goods is very suitable for the production of various films. However, NT goods are not always available, as they are a random product, so to speak.

Special features of regenerated plastics

Similar to paper, the quality of the recycled material decreases with the number of recycling processes. Polyethylene clumps together when it is recycled frequently: the granulate no longer melts completely and granules are formed. Or it partially burns in the production process and leaves a foul smell on the film. To avoid this, the various plastic regrinds are pre-sorted according to their qualities.

PREMIUM regenerate

The regenerates for our PREMIUM products come from high-quality recyclate, which enables excellent quality properties.

Standard regenerate

Standard regenerate is suitable for many applications with lower requirements. It is obtained from used products such as packaging films.