Creating 300x200x15mm Rubber Pieces using Plaster Mold at Home: Process & Materials

Question

Hello, I have an unusual problem, I have to add two pieces of rubber, measuring 300x200x15mm. Silicone, polyurethane is too soft in my opinion, plastic is too hard. So I thought about rubber. The problem is, it has to be a plaster mold.
Can anyone advise how to do this?

c2h5oh · Answer

The gum does not pour. The rubber is vulcanized:

meg_gda · Answer

I know that the rubber vulcanizes, but if I have a mold, it is a kind of cast. And vulcanization is a chemical process. If you do not know more about it, do not mention it, because you did not contribute this one to your friend

stanislaw1954 · Answer

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.

strucel · Answer

Interesting things, you say, the hardness of the rubber is 90 ° ShA top polyurethanes tend to be harder, the fact that they are difficult to access, most often they are also up to 90 ° ShA

meg_gda · Answer

I know that rubber vulcanizes, but if I have a mold, it is a kind of casting. And vulcanization is a chemical process. If you do not know more about it, do not mention it, because you did not contribute anything with this statement, my friend

Here I must admit that I am talking about polyurethane mass ... such as e.g. a sealant / adhesive for car windows, and not the one used, for example, in automotive suspension systems.

E8600 · Answer

It would be easier to advise something if you knew what this casting is for. Perhaps a silicone based composite?

meg_gda · Answer

You're right, buddy, it's about making an element of the motorcycle tank cover, it is originally made of rubber.

gasak · Answer

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. Regards

Doominus · Answer

You write too generally. There are many kinds of silicones to feed. You can buy foundry very soft and stretchy to fine detail. As well as tough and durable. The mold should be covered with several layers of paint and then with a molding separator.

keseszel · Answer

Fiberglass mat hardened after adjusting to the shape with resin. Then apply a putty. After smoothening and processing with sandpaper, paint several times with elastic rubber paint. This idea occurred to me. But I don't know if it would be cheaper than buying the original. How much is the original if you can know? Is available?

Anonymous · Answer

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 occupational health and safety is obligatory - it's easy to get burned and test in a very well ventilated room.

meg_gda · Answer

I thought about it too, but the question of durability and strength remains for a few / ... ten years. I am afraid that it will not stand the test of time. Unless I'm wrong?

Anonymous · Answer

A dozen or so years will probably not last, but maybe if it could be covered with a layer more resistant to UV (because it will be the most destructive factor), it might survive . 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 · Answer

I think this method is, in the end ... It didn't take long.
Original elements are unavailable, they were produced somewhere in the world a long time ago.
What about making it out of real rubber?
Somehow they were doing it in the factory a long time ago ... now you can't?

vodiczka · Answer

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. Get in touch with a small factory that produces rubber products. Maybe they'll have the right mix and sell it to you. You can also ask at the Gdańsk University of Technology, I remember that at the Łódź University of Technology, lab technicians made various interesting mixtures.

E8600 · Answer

I can see in black the plaster mold and the vulcanization of a thick rubber mixture.

Personally, I would not play such a thing, only if you already have a plaster mold, I would make a cast of some soft metal and cover the product with a thick layer of rubber paint, eg Plasti Lak.

pawelradomsko · Answer

Hello!
These products are of a good class: http://chester.com.pl/produkty/elastomery/
I once bought to repair mechanically damaged rubber covers and was very pleased. The price is not the lowest, but still not high compared to vulcanization.
But they have a hardness of up to 95ShA and the process of use is super simple.
Regards.

vodiczka · Answer

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 ° C The mixture, when heated (before it began to vulcanize), spread well in the mold. I did not recommend it due to the price but I share your opinion. I used them on molds for resin casting.

telecaster1951 · Answer

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. ;) Show a Friend a photo or a drawing of this item. I'll make something up. If this is what I think it is, it simply cannot be done without a rolling mill.

Anonymous · Answer

Maybe a colleague will reveal the secret about what we are actually deliberating on? Let it not turn out that NASA has no idea and assumed that doing something impossible to do must be commissioned to someone who does not know about it.

strucel · Answer

After all, he wrote - a motorcycle fuel tank cover, it would be suitable to be resistant to gasoline and UV produced today.

telecaster1951 · Answer

The problem is we don't know the shape. If I had known, maybe I would have come up with something. This is not a problem.

E8600 · Answer

I am also surprised that the car will not directly write about which motorcycle model is meant. Perhaps someone on the forum has such overlays preserved in the original.

meg_gda · Answer

Gentlemen, thank you for all the information, I am starting to think about the matter based on the new news. Tomorrow I will insert photos of the elements that I have to add.

meg_gda · Answer

I am sending photos of gums that I have to add:

telecaster1951 · Answer

This is a pressure shaped vulcanizate during vulcanization. Without form, you can't do it. The price of the mold is 50 thousand. All you can do is buy a block of gum and carve it. With a milling machine or by hand.

Creating 300x200x15mm Rubber Pieces using Plaster Mold at Home: Process & Materials

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