Remix each of the two components (part A and B) every time before using.

In order to prevent post curing, BLUESIL STOPPER BR1 has to be added to the B part prior to mixing (please check corresponding Technical Data Sheet). The optimized amount is 0.4 wt% BLUESIL STOPPER BR1 with regard to the B component.

1. Preparation of the two components

Both silicone components part A and B contain lightweight fillers in order to obtain a low density of the final gel. As these fillers tend to rise to the surface it is necessary to stir them up prior to use. The homogenised components are stable for up to one hour without the need for remixing. After one hour it is strongly advised to remix the components before further use.

Alternatively, the two silicone parts can be kept in slowly stirred tanks. Using this method requires temperature control in order to avoid alterations of potlife and degradation of the product.

2. Mixing the two components

The components A and B + BLUESIL  STOPPER BR1 are mixed according to:

Mixing Ratio A : [B + STOPPER BR1] (parts by weight)............................................................. 1 : 1

The mixing can be carried out either by using a low-speed electric or pneumatic mixer to minimise the introduction of air and to avoid any temperature increase.

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

3. Degassing

The mixture should be degassed preferably at 30 to 50 mbar to eliminate any entrapped air. If a dispensing machine is used, the two components are degassed separately prior to mixing.

The silicone mixture expands 3 to 4 times its initial volume and bubbles rise to the surface. Wait a few minutes to complete the degassing and then release the vacuum.

The silicone is ready for pouring, either by gravity or under low pressure.

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

4. Polymerisation

The system polymerises at 23°C. The curing may be slowed down at lower temperature or accelerated by heat.

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

  • Natural rubbers vulcanised with sulphur,

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

  • PVC stabilised with tin salts and additives,

  • Epoxy resins catalysed 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.


When stored in its original packaging at a temperature of between -10°C and +30°C, SILBIONE RT GEL 4324 LD A&B may be stored for up to 3 months from its date of manufacture.

Comply with the storage instructions and expiry date marked on the packaging.

Beyond this date, Bluestar Silicones no longer guarantees that the product meets the sales specifications.

Please consult the Safety Data Sheet of this product.


SILBIONE RT Gel 4324 LD A&B is a two component silicone elastomer which cures at room temperature by a polyaddition reaction. The polymerisation can be accelerated by heat.

The silicone material is delivered as two low viscous liquid components, which once mixed and cured, transform into an elastic gel. Polymerisation occurs without formation of heat.


2 Part RTV


  • Good imitation of female breast tissue
  • Low density and realistic touch of the final breast form
  • Fast and easy processing due to low viscosity and 1:1 mixing ratio


  • External light weight breast prosthesis

Asia Pacific;Europe Middle East Africa;Central and South America;North America

For information about Storage and Shelf Life for this product, please download the Technical Data Sheet.




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ColorWhitePairedCompEuropean Pharmacopea






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