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Status: Need is Closed

Alternative solutions for the use of carbon black in butyl rubber

Request Number

Point of Contact
Need was closed on
Aug 8, 2019

Siemens is searching for a new IIR material that does not contain any carbon black as a filler.

The material will be used in O-rings. An O-ring is a mechanical gasket in the shape of a torus. It is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.


Elastomer compounds often contain carbon black as a spherical filler, e.g. to adjust hardness or compression set. With these rubber compounds (e.g. NBR, EPDM or IIR) external suppliers produce O-rings by injection molding in different geometries.

We are looking for an IIR that does not contain any carbon black. This is necessary to prevent contact corrosion between IIR and various metals.

Key success Criteria

Following key success criteria have to be fulfilled:

  • Type of elastomer: IIR or CIIR
  • Working temperature: -40°C - +80°C
  • Hardness: Shore A 50 – 80
  • Lifetime: about 40 years
  • Lowest possible permeation coefficient for O2, N2 and CO2
  • No usage of carbon black
  • General suitability of the compound for production of O-rings
  • General suitability of the compound for application as O-rings
Possible Approaches

Siemens is open to all compounds of the basis of IIR that meet the success criteria.

Approaches not of Interest

Carbon black as a filler is not allowed in the compound.

No materials from the List of Declarable Substances according to REACH are allowed. Reference list can be found here:


Due Date
Aug 2, 2019
Items to be submitted

We are looking for concise, non-confidential proposals. The proposal should:

  • Describe the technical approach
  • Provide information on the performance of the technology (if available)
  • Include a description of the responding organisation or team and their experience.

To Respond, please use the Respond button located at the end of this page.

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Gallery Moderator(s)
Dezarae Carver
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