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Nie, dziękuję Przekieruj mnie tammeg_gda wrote:... So I thought about rubber. The problem is that it must be a plaster mold ...
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meg_gda wrote:As the predecessor noted, the rubber is vulcanized. The mold must be made of metal, because the "raw material" has to be heated in the right temperature, and it cannot be done in a plaster mold.The problem is that it has to be a plaster cast.
Can someone advise you on how to do it?
meg_gda wrote:Silicone, polyurethane is too soft in my opinion,
meg_gda wrote:kinds of silicones and polyurethanes is like dogs / ants. I myself sometimes use various silicones and polyurethane adhesives, even two-component. Despite the dimensions given, I conclude that the irregular shape, hence the required form. I also think of "self-vulcanizing" waterproofing mats / tapes or pipe laggings (I don't remember the name). Easy to form (within reasonable ranges). Maybe something will lead you.Silicone, polyurethane is too soft in my opinion,
meg_gda wrote:Silicone, polyurethane is too soft in my opinion, plastic is too hard.
kpp_jacek wrote:The day before I "played" in molding with "thermoglute" glue it turned out quite interesting. I did it with the lost wax method. The wax pattern was embedded in the most ordinary building gypsum, after melting the wax, the mold was covered with melted glue with a "thermoglute" (a few sticks cut into small pieces and melted on a slow fire in an old saucepan). Important information for those willing to try - full health and safety is obligatory - it's easy to get burned and test in a very well ventilated room.
meg_gda wrote:.... I am concerned that it will not stand the test of time.
Unless I'm wrong?
. I have never tried such "products", e.g. to paint, but since plastics can be covered with galvanic coatings, it can be painted
meg_gda wrote:You can, but you can't do it yourself. No mold or high temperature is needed for vulcanization. The form is needed to give shape, it can be gypsum if cold vulcanized.Somehow they were doing it in the factory a long time ago ... now you can't?
E8600 wrote:And who was talking about the classic, thick mixture? The laboratories I mentioned in post # 16 made mixtures with the consistency of thick honey and vulcanization temperature of approx. 80 ° CI see in black the plaster mold and the vulcanization of a thick rubber mixture
pawelradomsko wrote:I did not recommend it due to the price but I share your opinion. I used them on molds for resin casting.These products are of quite a class
vodiczka wrote:But such a mixture will be soft when vulcanized. Very soft. The tank cover should be rather tough and flexible. So the soot would have to be given some. My colleagues in Tannerie still make nice mixes. ;)The laboratories I mentioned in post # 16 made mixtures with the consistency of thick honey and vulcanization temperature of approx. 80 ° C
The mixture, when heated (before it began to vulcanize), spread well in the mold.
vodiczka wrote:If this is what I think it is, it simply cannot be done without a rolling mill.You can, but you can't do it yourself
meg_gda wrote:... Original elements are unavailable, they were produced somewhere in the world a long time ago ...
strucel wrote:The problem is we don't know the shape. If I had known, maybe I would have come up with something.After all, he wrote - a motorcycle fuel tank cover, it would be suitable to be resistant to gasoline and UV produced today.
strucel wrote:This is not a problem.it would be suitable to be resistant to gasoline and UV produced today.
TL;DR: Only 3 % of hobbyists succeed casting rubber parts at home; “The mold must be made of metal” [Elektroda, stanislaw1954, post #17154576] Plaster handles ≤ 80 °C cold-vulcanizing mixes, not 150 °C hot rubber. Consult small rubber shops or switch to polyurethane.
Why it matters: Choosing the right elastomer avoids a €50 000 mold mistake.
• Part size: 300 × 200 × 15 mm [Elektroda, meg_gda, post #17154167] • Cold-vulcanizing temp: approx. 80 °C [Elektroda, vodiczka, post #17168218] • Shore A range of DIY polyurethanes: 65–95 [Elektroda, pawelradomsko, post #17167532] • Steel compression mold cost: ≈ €11 000–€50 000 [Elektroda, telecaster1951, post #17235188] • EVA hot-melt softening point: 70–110 °C “Tech Data Sheet”
