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Two-part silicones use moisture in the second component as well as a cross-linker such as active alkoxy to cure the silicone in a process called condensation curing. Two-part silicones can also be platinum catylized in a "addition" reaction. Other reactive species to facilitate cross-linking include
251:). No release agent is required, obviating post-production cleanup. Silicones also exhibit good chemical resistance and high-temperature resistance (205 °C, 400 °F and higher). For this reason, silicone molds are suitable for casting low-melt metals and alloys (e.g.
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RTV silicones are made from a mixtures of silicone polymers, fillers, and organoreactive silane catalysts. Silicones are formed from a Si–O bond, but can have a wide variety of side chains. The silicone polymers are often made by reacting dimethyl dichlorosilane with water.
173:(without using a release agent). A more recent innovation is the ability to 3D print RTV silicones. RTV silicones' industrial applications include aviation, aerospace, consumer electronics, and microelectronics. Some aviation and aerospace product applications are
282:). Silicones are usually very thick (high viscosity), and must be vacuum degassed prior to pouring, to minimize bubble entrapment. If making a brush-on rubber mold, the curing time factor between coats is long (longer than urethanes or
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agent. Usually, the mixing ratio is a few percent. For RTV silicone to reproduce surface textures, the original must be clean. Vacuum de-airing removes entrained air bubbles from the mixed silicone and catalyst to ensure optimal
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One-part silicones make use of moisture in the atmosphere to cure from the outside towards the center. The time to cure will decrease with an increase in temperature, humidity and surface-area-to-volume ratio.
137:, which affects reproduction times. In casting and mold-making, RTV silicone rubber reproduces fine details and is suitable for a variety of industrial and art-related applications including
290:). Silicone components (A+B) must be mixed accurately by weight (scale required) or they do not work. Tin catalyst silicone shrinks somewhat and does not have a long shelf life.
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that cures at room temperature. It is available as a one-component product, or mixed from two components (a base and curative). Manufacturers provide it in a range of
322:
Jorge
Cervantes, Ramón Zárraga, Carmen Salazar-Hernández "Organotin catalysts in organosilicon chemistry" Appl. Organometal. Chem. 2012, vol. 26, 157–163.
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RTV silicone rubber has excellent release properties compared to mold rubbers, which is especially an advantage when doing production casting of resins (
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applications for some optically clear grades. It is also used widely in the automotive industry as an adhesive and sealant, for example to create
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Fillers such as acetic acid can provide a fast cure time, while oxides and nitrides can provide better thermal conductivity.
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RTV silicone rubbers are, however, generally expensive--especially platinum-cure. They are also sensitive to substances (
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are typically on the order of minutes, with cure times on the order of hours.
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Hans-Heinrich
Moretto, Manfred Schulze, Gebhard Wagner (2005) "Silicones" in
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Schneberger, Gerald L. (2018). "RTV Silicone
Adhesive Sealants".
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149:, and architectural elements. RTV silicone rubber can be used to
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To produce the material, a user mixes silicone rubber with the
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Lorenz, Günter, and
Andreas Kandelbauer. “14 - Silicones.”
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298:during the curing process, and this can attack
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34:from very soft to medium—usually from 15 to 40
343:Ullmann's Encyclopedia of Industrial Chemistry
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445:"Silicone 3D Printing: The Ultimate Guide"
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116:acetoxy, amine, octoate, and ketoxime.
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194:Good characteristics of easy operation
38:A. RTV silicones can be cured with a
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230:resistance, and ageing resistance
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368:Handbook of Thermoset Plastics
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222:High-temperature resistance,
235:Advantages and disadvantages
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388:Adhesives in Manufacturing
153:materials including wax,
351:10.1002/14356007.a24_057
345:, Wiley-VCH, Weinheim.
26:silicone) is a type of
16:Type of silicone rubber
421:"Silicone 3D Printing"
159:low melt alloys/metals
111:Two-component silicone
102:One-component silicone
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201:and good flow-ability
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62:for reproducing, and
42:consisting of either
294:-based RTV releases
88:dimethylpolysiloxane
52:dibutyltin dilaurate
481:Sculpture materials
179:electronics potting
175:cockpit instruments
219:Favorable hardness
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22:(room-temperature-
398:978-1-351-46883-1
210:Favorable tension
50:compound such as
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453:. Retrieved
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428:. Retrieved
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284:polysulfides
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270:-containing
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261:Wood's metal
241:polyurethane
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126:curing agent
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120:Applications
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56:over-molding
20:RTV silicone
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304:copper wire
296:acetic acid
215:deformation
130:vulcanizing
24:vulcanizing
476:Elastomers
470:Categories
455:2024-05-27
430:2017-01-05
407:1061100690
310:References
276:Plastilina
139:prototypes
70:in place.
32:hardnesses
486:Silicones
425:Picsima3D
245:polyester
206:shrinkage
199:viscosity
183:gasketing
177:, engine
147:sculpture
143:furniture
74:Chemistry
58:, making
274:such as
189:Features
163:urethane
44:platinum
40:catalyst
255:, tin,
86:Linear
68:gaskets
405:
395:
268:sulfur
259:, and
257:pewter
247:, and
228:alkali
197:Light
155:gypsum
288:latex
249:epoxy
167:epoxy
60:molds
46:or a
36:Shore
403:OCLC
393:ISBN
263:).
253:zinc
226:and
224:acid
204:Low
161:and
151:cast
64:lens
347:doi
324:doi
213:No
169:or
128:or
48:tin
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
