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Models are made in a wide range of materials whose surface condition and
porosity may change as a result of ageing. Even though Rhodorsil® RTV-2's
inherently do not adhere to most materials, it is usual to take certain
precautions before taking impressions.
It is notably recommended to prepare the model to avoid any RTV sticking
and thus damaging the model. Various possibilities are offered to the user
the following examples - which are not limiting - have been tested in
laboratories |
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MATERIAL OF THE MODEL |
RECOMMENDED TREATMENT |
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PLASTER, CONCRETE, STONE, "BISCUIT", TERRACOTTA |
Remove dust and apply a pore filler from among the following;
- polyvinyl alcohol type 4/125 diluted
- soaping: dissolve 250g of glycerine soap in one liter of boiling water; use once cool
- wax or paraffin deposit (diluted to 5% in xylene)
- vaseline deposit
- varnishing: gum lacquer or cellulose or acrylic varnish |
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METAL |
- Degrease with a solvent or wash with a water based solution made with 5% liquid detergent, then dry
- Wax |
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GLASS, PORCELAIN, CERAMICS |
- Apply a very thin coat of vaseline |
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LEATHER |
- Apply a very thin coat of vaseline
- Wax |
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WOOD |
- Apply wax or vaseline, a cellulose pore filter or cellulose varnish |
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PLASTIC |
- Degrease with an appropriate solvent for the plastic concerned |
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RTV-2 |
- Apply a very thin coat of vaseline
- Wax |
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RESINS (POLYURETHANE, POLYESTER, EPOXY, ACRYLIC) |
- Apply polyvinyl alcohol then a very thin coat of vaseline
- Wax |
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WAX |
- No treatment required |
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POSITIONING THE MODEL |
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When cast moulding, the model is installed in a frame that can be dismantled or left in place. The following precautions should be taken: |
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HISTORICAL OBJECTS AND MONUMENTS
This type of moulding requires a specific approach in order to avoid damaging the models.
Notably, we have to ensure the compatibility between the model and the insulating products (pore fillers, release agents).
It should also be checked that if demoulding takes place significantly after the recommended time (23°C for 24 H) has lapsed, there is no adhesion onto the model.
This can be performed on a non-visible part of the model (e.g. the base) or on a test sample |
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- The model must be held in place on the rigid base, either by attaching it or by bonding it temporarily using an adhesive or modeling dough, plastiline etc. |
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- Any gaps that we do not want to take the imprint of must be previously filled with plastiline. It is also recommended to seal the base of the model. |
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To create the casing use the following materials:
- glass, wood, plastics, metals, earth, plastiline, cardboard etc. with the usual precautions (surface preparation). |
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