Remix each of the 2 components (base and catalyst) every time before using.
1. Mixing of the two components
To 100 parts of BLUESIL RTV 3240 add 4 parts by weight of the selected catalyst. The two components are thoroughly mixed either using an electrical or pneumatic mixer, on a low speed setting so as to limit the inclusion of air in the mixture as well as the temperature rise.
After mixing base and catalyst, it is recommended to eliminate entrapped air.
If the processing is done with the help of a machine both parts are degassed before mixing.
The BLUESIL RTV 3240 is degassed under a vacuum of 30 to 50 mbar. Under vacuum pressure, the product will expand 3 at 4 times its initial volume and forms bubbles on its surface.
These bubbles will disappear gradually and the mixture will sink back down to its initial volume within 5 minutes. Release the vacuum and repeat the operation a few minutes later.
Remark: release the vacuum several times improves the degassing. For easier degassing only fill a recipient to 1/3 of its height.
3. Cross linking
When taking a print or a particularly rough or porous surface (wood plaster, stone), gripping or suction may hamper mould release, although BLUESIL RTV 3240 is anti-adhesive by nature.
To forestall any difficulties, a separating agent (Vaseline or acrylic varnish, depending on the nature of the moulded material), should be applied in a layer fine enough not to reduce the relief to be reproduced.
BLUESIL RTV 3240 should be introduced into the lowest part or deepest part of the mould. Slow mouldfill will avoid inclusion of air.
For imprinting of models of very fine contour, mouldfill should be preceded by a paintbrush application of a fine layer of RTV.
The viscosity of BLUESIL RTV 3240 can be reduced by using BLUESIL FLD 47V50, added up to 10% with respect to BLUESIL RTV 3240. This will improve flowing of the mixed product without causing significant changes of the mechanical properties of the elastomer.
BLUESIL RTV 3240 may bond to metal, glass stratified materials, etc. if these substrates receive prior primer applications Please do contact us for any question concerning primers.
In cases where it is wished to bond the cross-linked BLUESIL RTV 3240 onto a substrate or onto itself, the surface should be abraded with an emery cloth and covered with a fine layer of CAF. The substrate will be primer treated as shown above, and the bonded joint held in place for 24 hours.
Note: Adhesion problems are by nature complex, and the user is advised to carry out preliminary tests.
Part used drums should be resealed between each use.
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BLUESIL RTV 3240
BLUESIL RTV 3240 is a silicone elastomer which, after the addition of BLUESIL CATA N, cures at room temperature and leads to flexible and elastic material.
The crosslinking reaction occurs, without release of heat, the formation of isopropanol, whose dispersion is required before used of the mould or the protected object
Moulding and reproduction
BLUESIL RTV 3240 enables mass reproduction of shapes, particularly in the following fields:
- Rigid PUR items of furniture or decoration.
- Automobile industry accessories (dashboards, armrests, etc.) in expanded semi-rigid PUR, with self-formed or pressure-particle applied skin.
- Plaster decorative elements (cornices, ceiling roses, etc.).
- Jewellery and decorative items using wax moulding techniques.
Note: BLUESIL RTV 3240 cannot be used for polyester mouldfill, as these material’s properties are inhibited on mould contact.
Electronics and electronic technology
Protection, by filling or coating, of modules or electric technology assemblies.