1. Mixing the two components

BLUESIL RTV 3440, 3450, 3450 QC A&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.

2. 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.

3. Polymerisation

BLUESIL RTV 3440, 3450, 3450 QC A&B polymerises at 23°C. 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,

  • some 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. 

BLUESIL RTV 3440 A may be stored at temperatures between -10°C / 14°F and 30°C / 86°F for up to 12 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.


BLUESIL RTV 3440, 3450, 3450 QC 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 viscous liquid components, which once mixed and cured, transform into an elastic and resistant elastomer. Polymerisation occurs without production of heat.


2 Part RTV

  • Highly accurate reproductions.

  • Dimensional stability.

  • Good mechanical properties combined with a high Shore A.

  • Chemical and thermal resistance.

  • Fast mixing and easy processing due to the low viscosity.

Reproduction of various kinds of 3D objects in:

  • Plaster.

  • Wax.

  • Polyester.

  • Low melting point metals.

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




Viscosity40000PairedCompBSI HL 019mPa.s




Viscosity500PairedCompBSI HL 019mPa.s






pot-life_0d649a54-7503-4c7c-a047-9d0c4b3e9f6apot-life_0d649a54-7503-4c7c-a047-9d0c4b3e9f6aPot life90PairedMixBSI HL 016min
hardness_cd523e03-72a3-4261-93f9-36f7bbeeafb1hardness_cd523e03-72a3-4261-93f9-36f7bbeeafb1Hardness40PairedMixDIN 53505sh.A





BLUESIL RTV 3440 BBLUESIL RTV 3440 B/our_offer/Product/90003333/90003332/BLUESIL-RTV-3440-B