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Silicone (Rochow Direct Process)
Clay

Nilikha ni

Clay

22. Setyembre 2026DK
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Silicone (Rochow Direct Process)

Silicones - chains of silicon and oxygen carrying methyl groups - were known from Frederic Kipping's laboratory work, but could only be made a few grams at a time. In 1940 Eugene Rochow at General Electric found a one-step route: pass methyl chloride over hot silicon with copper, and methylchlorosilanes come straight off. Richard Müller found the same reaction independently in Germany, which is why it is also called the Müller-Rochow process. It is how silicones are still made. **US 2,380,995**, "Preparation of organosilicon halides", Rochow, assigned to General Electric, granted 7. August 1945, claims "effecting reaction between silicon and a hydrocarbon halide" with a copper catalyst at 200–500 °C. **Methyl chloride and chlorosilanes are toxic and stay in the plant.** You use the product: a two-part silicone mould of glass marbles, then cast hot wax in it, again and again.
Baguhan
4 hours plus two cures

Mga Tagubilin

1

Build the box

Cut foam board and hot-glue an open box 60 x 40 mm inside, 50 mm tall. Seal every inside seam with a bead of glue - silicone finds any gap.

Mga materyales para sa hakbang na ito:

Foam board sa paggawa ng modeloFoam board sa paggawa ng modelo1 pilyego

Mga kailangang kasangkapan:

Kutsilyong Pang-arteKutsilyong Pang-arte
Baril ng mainit na pandikitBaril ng mainit na pandikit
Panukat na AseroPanukat na Asero
2

Clay bed and keys

Press sulphur-free modelling clay 20 mm deep into the box. Push two 16 mm marbles exactly halfway in, 20 mm apart. Press four dimples in the clay with a pencil end: these are the registration keys.

Mga materyales para sa hakbang na ito:

Luwad na pang-anyoLuwad na pang-anyo150 g
Holen na salaminHolen na salamin2 piraso

Mga kailangang kasangkapan:

Digital na Kalibrador 6 PulgadaDigital na Kalibrador 6 Pulgada
3

Weigh and mix

Weigh part A and part B at the kit's stated ratio into a mixing cup (the notebook gives the mass). Stir 3 minutes, scraping sides and bottom.

Mga materyales para sa hakbang na ito:

Set sa paggawa ng hulmahang silikonSet sa paggawa ng hulmahang silikon1 kit

Mga kailangang kasangkapan:

Tumpak na Digital na TimbanganTumpak na Digital na Timbangan
Mga tasang panghalong may bahagdanMga tasang panghalong may bahagdan
PanghaloPanghalo
4

First pour

Pour in a thin stream from 30 cm into one corner, never onto the marbles, until 6 mm above them. Cure for the kit's time.

Mga kailangang kasangkapan:

Mga tasang panghalong may bahagdanMga tasang panghalong may bahagdan
5

Flip and release

Flip the box, peel away all clay and leave the marbles in the silicone. Brush a thin coat of petroleum jelly over the silicone face - silicone bonds to silicone.

Mga materyales para sa hakbang na ito:

BaselinaBaselina5 g
6

Second pour

Mix a second batch the same way and pour 6 mm above the marbles. Cure again.

Mga materyales para sa hakbang na ito:

Set sa paggawa ng hulmahang silikonSet sa paggawa ng hulmahang silikon1 kit

Mga kailangang kasangkapan:

Tumpak na Digital na TimbanganTumpak na Digital na Timbangan
Mga tasang panghalong may bahagdanMga tasang panghalong may bahagdan
7

Open and cut sprues

Tear off the foam board, part the halves and pop out the marbles. With the craft knife cut a 5 mm cone from the top face into each cavity.

Mga kailangang kasangkapan:

Kutsilyong Pang-arteKutsilyong Pang-arte
8

Cast wax

Melt paraffin wax in the double boiler to 75 °C. Band the halves shut, pour through each sprue, cool 30 minutes, open. Count how many casts it survives.

Mga materyales para sa hakbang na ito:

Kandilang paraffinKandilang paraffin100 g
Mga gomaMga goma1 pakete

Mga kailangang kasangkapan:

Dobleng kalderoDobleng kaldero
Termometro sa panghimagasTermometro sa panghimagas
Mga guwantes sa paghihinangMga guwantes sa paghihinang
Malinaw na Salaming PangkaligtasanMalinaw na Salaming Pangkaligtasan
9

Troubleshoot the mould

Work down in order; each question points to one step to redo.

Flow

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10

Reaction, pour size, siblings

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11

History & Context

**What the patent specifies:** silicon reacted with a hydrocarbon halide over copper at 200–500 °C to give organosilicon halides. **Modern build (derived):** a two-part room-temperature-curing mould silicone. Silicone first served in the Second World War as grease and insulation for aircraft ignition systems; today it is sealant, bakeware, medical tubing and every maker's mould rubber. Its limits: it tears easily once nicked, is expensive, and a platinum-cure grade will not set against sulphur, some clays and latex gloves.

Mga Materyales

7

Mga Kinakailangang Kasangkapan

11

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Mekanika

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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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