1. Preparation of the two components
The silicone components contain a lightweight filler that gives the low density of the final gel. As this filler tends to rise to the surface it is necessary to stir up the components prior to use.
The homogenised components are stable for up to one hour without the need for remixing. After one hour we advise that the components are remixed before use.
Alternatively, they can be kept in slowly stirred tanks. Using this method requires temperature control to avoid degrading the product and alterations of the potlife.

2. Mixing the two components
The components A and B are mixed by weight in the above indicated ratio. The mixing can be carried out either by hand or 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 to times of its initial volume and bubbles rise to the surface. The bubbles progressively disappear and the mixture returns to its initial volume after 5 to 10 minutes. Wait a few minutes to complete the degassing and then flash the vacuum. The silicone is ready for pouring, either by gravity or under low pressure.
Note: Flashing 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 . The curing may be slowed down at lower temperature and contrary 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,
  • certain organic solvents, e.g. ketones, alcohols, ether etc.

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


SILBIONE RT GEL 4621 SLD A may be stored for up to 4 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.


SILBIONE RT GEL 4621 SLD A&B and SILBIONE RT GEL 4723 SLD A&B are two component silicone elastomers that crosslink at room temperature by polyaddition reaction. The polymerisation can be accelerated by heat.
The silicone materials are delivered as two low viscous liquid components, which once mixed and cured, transform into an elastic and resistant gel. Polymerisation occurs without the evolution of heat.


2 Part RTV



  • Good imitation of female breast tissue
  • Low density
  • Good adhesion to PU film
  • Fast and easy processing due to low viscosity and 1:1 mixing ratio



  • External low weight breast prosthesis


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




Viscosity7500PairedCompISO 2555mPa.s
ColorBeigePairedCompEuropean Pharmacopea




Viscosity7500PairedCompISO 2555mPa.s
ColorBeigePairedCompEuropean Pharmacopea






penetration_a142c699-2b17-4f82-882a-75f6253332edpenetration_a142c699-2b17-4f82-882a-75f6253332edPenetration220PairedMixISO 21371/10mm
pot-life_0d649a54-7503-4c7c-a047-9d0c4b3e9f6apot-life_0d649a54-7503-4c7c-a047-9d0c4b3e9f6aPot life40PairedMixmin





SILBIONE RT GEL 4621 SLD BSILBIONE RT GEL 4621 SLD B/our_offer/Product/90034274/90034273/SILBIONE-RT-GEL-4621-SLD-B