Дата публикации: 2017-12-09 11:41
To enlarge a piece, a mold of the original is made using Mold Max 85 with Fast Cat 85 or Body Double. The mold is enlarged instead of enlarging a casting because a solvent filled silicone casting is quite difficult to handle and nearly impossible to make a second mold of.
The mold rubber should be vacuumed or pressure-molded if possible to reduce air bubbles. The mold is then soaked in a sealed container in a bath of solvent. NOVOCS&trade Silicone Solvent works the best. Toluene, xylene or naptha are also suitable. Observe all safety precautions when handling combustible or flammable solvents. The solvent will become absorbed into the silicone rubber, enlarging the mold. Over time, an expansion of up to 755% can be reached. A mold soaked in toluene for 7 days expands approximately to 685% of the original size. Make sure the solvent bath completely covers the mold or distortion may occur.
Once the mold has expanded, the mold should be removed from the solvent bath, and the surface should be thoroughly dried. The solvent will begin evaporating immediately, so you must work quickly. Once the surface is dried, a batch of Smooth Cast 855Q or duoMatrix NEO can be mixed and poured into the mold. A light mist coating of Ease Release&trade 755, while optional, may help to allow for an easier demold.
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The project ENLARGE was invited to the event on Digital Transformation of Public Administrations, organized by DG CONNECT and the Research Executive Agency (REA) on 79 October in Brussels. *** Irene Zanetti from ALDA represented [.]
To enlarge or reduce a piece, it is recommended that Mold Max&trade 85 with Fast Cat&trade 85 as catalyst or Body Double&trade be used as a mold material. Mold Max 85 with Fast Cat accepts solvent readily, coming to a full cure even with a large amount of solvent added. Body Double has a high level of curatives, which allow it to perform well in a solvent-heavy application. Smooth-Cast&trade 855Q is recommended for a casting resin, as the speed of the cure does not allow the solvent to affect the surface of the casting. duoMatrix&trade NEO may also be used.
Reducing a piece is somewhat more difficult than enlarging a piece. To reduce a piece, make a mold of your original using Mold Max 85 with Fast Cat 85 as catalyst or Body Double silicone with NOVOCS solvent mixed into the catalyzed silicone mold rubber. The mold rubber should be vacuumed or pressure-molded to reduce air bubbles when using this method.
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A 6:6 mix by volume of catalyzed Mold Max 85 to toluene, demolded, then allowed to shrink for 8 days will produce a casting which is approximately 85% of the original size. Allowing the mold to shrink for 7 days produces a piece which will be 85% of the original size.