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Lubricants - essential for the PVC production

"Lubricants are an important product area for ADD-Chem. Our company currently sells lubricants in 12 countries. We want to expand this success even further."

Jürgen Hartmann
Managing director ADD-Chem Germany

Plastics companies use lubricants in extrusion and injection molding processes. External lubricants reduce the adhesion to the metal surfaces of the machines used. They enable further processing of the polymer, for example with the help of extruders. In many cases, oxidized waxes are also used to optimize the friction, shear and mixing of the melt.

The lack of external lubricants can cause the polymer melt to burn and stick.

Internal lubricants improve the flow behavior. This allows polymers such as PVC to be molded by injection molding

The advantages of ADD-Chem lubricants are:

  • Reduction of friction on metal surfaces
  • Lowering the melt viscosity
  • Improving the homogeneity of the polymer

Processing of the plastics would hardly be possible without lubricants. Internal lubricants are compatible with the polymers due to their polarity. For this reason, high dosages can be implemented.

ADD-Chem offers you all common lubricants for extrusion and injection molding:

  • Stearic acid derivatives
  • PE waxes
  • Paraffin waxes
  • Metal soaps
ADD-Chem adapts recipes to your requirements
highest quality at reasonable prices

Other types of lubricants are:

  • Oxidized PE waxes
  • Montan wax substitute
  • Inner waxes


Internal lubricant

ADD-Chem offers plastics companies the following internal lubricants:

1. Ester waxes

External lubricants

The external lubricants include:

1. PE waxes
2. Paraffin waxes
3. stearic acid

The best consultation

More than 30 years of experience in the plastics industry: For this reason, we are at your disposal for any questions you may have about lubricants.

What are lubricants?

Lubricants are solid or liquid raw materials that serve as lubricants.

There is a division into internal and external lubricants:

Internal lubricants reduce the friction between the individual polymer chains. This lowers the melt viscosity of the material. Its polarity makes it unproblematic to use with PVC.

Even high dosages do not affect their transparency. In addition, there are no “exuding effects”. This ensures problem-free further processing.

External lubricants are used to reduce the friction between polymers and metal surfaces. They are non-polar and incompatible with the polymer. For this reason, excessively high doses can lead to cloudiness and “exudation”.

In addition, lubricants with a combined effect are used. This means that they have both an internal and an external mode of action.

Lubricant: The ADD advantages at a glance

Do you have problems with the surface gloss? Is the pressure build-up in the machine too low? ADD-Chem offers wax types for all users.

The following lubricants are available:

  • Stearic acid and derivatives
  • PE waxes
  • Paraffin waxes
  • Ester waxes

Stearic acid is a low melting wax. This is mostly used for coatings. In addition, compounders can purchase calcium, zinc and magnesium stearates from us. 

Plastic companies are producing PE waxes. This type of wax has proven its worth in extrusion and injection molding.  

Paraffin waxes have a higher melting point. As a result, they are less deposit-forming.

The film industry uses ester waxes to facilitate the rheological flow.

Do you have any questions for our team?