1. Mixing the two components

The components A and B are mixed by weight in the above indicated ratio. In case of hand mixing, degas the mix under vacuum 3-5 kPa before processing the product.
Use preferably static mixing equipment to prevent bubbles and avoids formation.

Note: Release the vacuum once or twice accelerates the degassing. It is recommended to use a container with a high diameter / height ratio.

After use, packaging must be tightly closed and protected against moisture contamination to preserve its properties.

It is also possible to use a special mixing and dispensing machine for the two silicone components. Further information is available upon request.

2. Polymerization - Curing

BLUESIL ESA 7231 A&B starts curing even in confined spaces as soon as it is mixed. When exposed to temperature, cure rate is increased and the material should be completely crosslinked after a few minutes at relatively high temperature.


For example, for a 1mm thick layer of BLUESIL ESA 7231 A&B:

Curing time as a function of the temperature (approx.) :
- 5 to 8 minutes at 90°C
- 2 minutes at 110°C
- 1 minute at 130°C


Adhesion to substrate will depend upon the curing conditions. A preliminary test is recommended to determine optimum cure conditions, and a temperature ramp-up in industrial ovens is always preferred to avoid bubbles and ensure best adhesion.


Additional post-cure is needed for food compliance.


Contact with certain materials can inhibit the crosslinking. See list below:

- Natural rubbers vulcanized with Sulphur.

- RTV 2 silicone elastomers catalyzed with metal salts, e.g. tin-compounds.

- PVC stabilized with tin salts and additives.

- Epoxy resins catalyzed with amines.


In case of doubts, it is recommended to test the substrate by applying a small quantity of the mixed silicone on a restricted area.

BLUESIL ESA 7231 B may be stored at a temperature below 40°C / 104°F for up to 12 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.


BLUESIL ESA 7231 A&B is a liquid two-component, polyaddition heat curing silicone elastomer.

After polymerization BLUESIL ESA 7231 A&B forms a flexible adhesive and resistant material to thermal, climatic and environmental attack.


2 Part RTV

  • High mechanical performances.
  • Ease of processing, easy coating and covering.
  • Good adhesion over various substrates.
  • Solventless: no special precautions required for the workstation environment.
  • Outstanding protection of electronic device against mechanical stress due to temperature variations and vibrations.
  • Long pot life at room temperature.


BLUESIL ESA 7231 A&B could be supported versus some Food Contact regulations in force in certain countries. In that case, depending on the application, a specific Product Information will be delivered.


Contact ELKEM SILICONES for more detailed information.

BLUESIL ESA 7231 A&B is intended:

  • Sealing and protection for electronics casings protection and applications.

  • Adhesive for flexible bonding application.

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BLUESIL ESA 7231 ABLUESIL ESA 7231 A/our_offer/Product/90061673/90061674/BLUESIL-ESA-7231-A