Molding of rubber blanks

Molding is also called compression molding and is particularly suitable for larger rubber blanks.

Olet industrigummi A / S offers solutions adapted to your needs.

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Molded rubber blanks for industry

Molding – Compression molding

Molding, or compression molding, is the oldest and simplest method of producing rubber items. The method is popular for especially larger topics. Molding is particularly suitable for:

  • Simple geometries
  • items without metal
  • Items with low requirements for tolerances and “fins”
  • Larger items

What is molding and compression molding?

Molding and compression molding of rubber blanks is a method that provides unique properties to the workpiece. The method can, among other things, meet several requirements for, for example:

  • Sealing functions
  • Flexibility
  • Attenuation
  • Durability
  • Chemical resistance

The process itself takes place by clamping the mold on a hydraulic press with heat in the planes. In this mold the material is placed, after which the upper part of the machine is pressed down into the mold and forces the material out into all cavities in the mold. As a result, the rubber blank is formed under pressure and now only has to be cleaned off of excess rubber residues.

Do not be confused by the names of this method. Both molding and compression molding are used about the same process.

Injection molding and compression molding - Mold

Advantages and disadvantages of compression molding


The advantages of compression molding:

  • cost effective as the tool and molds are quite budget friendly.
  • good for smaller series, due to the cost-effective setup.
  • Less waste as there are no flow channels in the mold. All molds in rubber production must be overfilled to be sure to get a nice finish on the workpiece.
  • particularly suitable for large items, as well as large rubber-metal items, as it is only the capacity of the molding machine that sets the limit for the size.


  • the method is quite simple, but it requires more manual handling than other casting methods.
  • the process time is also longer for this method. It is due to the poor conductivity of rubber that the curing time is relatively long.
  • the method is not suitable for rubber blanks with a complex geometry, as it can be difficult to get the rubber to flow out in very complex designs. Then the most optimal manufacturing method will be transfer molding or injection molding.
  • The risk of contamination of the material is significantly greater than with other casting methods.
  • The mold may be worn by the repeated process and in need of remanufacturing.

Gummibelægning af valser

Gummibelægning af valser er nødvendigt i næsten alle former for industri, til mange forskellige formål. Olet har mere end 70 års erfaring med Dansk gummi og vi er specialister i gummibelægning af valser. Vi hjælper dig i hele processen, fra udformning, valg af gummikvalitet og til den færdige valse.

Har du nogle kravsspecifikationer, som gummibelægning af valser skal leve op til, sørger vi naturligvis for at leve op til disse krav. Derudover kommer vi gerne med optimeringsforslag til dine valser, så du kan få mest muligt ud af dine valser og gummiets levetid.

Rubber coating on rollers and wood rollers

Danish produced rubber items

All our production takes place in Denmark. We have chosen this to be able to ensure that we always deliver a high and uniform quality of rubber items. It is also important to us that we can deliver on time and ensure our customers a high level of delivery security.

Let us help you find the right casting method

Olet Industrigummi A / S has had rubber production since 1947 and therefore has many years of experience in advising customers on the best solution.

Feel free to contact us for a chat about your next project.