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Ravelling Polyurethane Castings

Its no news that thanks to technology we can enjoy a good quality of life . Since different polymers came into use, people have found different ways to bend them to their will. One common area is in polyurethane casting, there products that are made of urethane are made to undergo a casting process.

Temporary polymers are part of this process , they are made from a master pattern and in other cases part of it. The process is the most ideal in the making of prototypes of different components today. For the materials that cannot be made to undergo the rapid prototyping process, polyurethane casting is used instead. Urethane makes it top for this process because its cost effective and matches the production material better than other options available. Urethane also makes it possible to do a duplication of production parts with the desired accuracy. Complex angles and other details are easy to capture with the mold because it is easy to work with. Molds used in the castings is derived from room temperature vulcanization silicone.

The prototyping process will create castings that have all the properties of the production parts such as size , form and other aspects of dimensions. Through the use of urethane castings, manufacturers can economically produce prototypes that will be used for marketing, sale and consumer product discussions. Apart from the use of urethane in the casting process, it is also used in the testing of the prototypes. As much as urethane molds will carry the properties of the production material in the prototypes, it’s not ideal o carry tests on them when the production material will be more significant. The master pattern or part from which the mold is produced from a number of methods.

The most common of the methods, however, will be stereolithography. This is an additive industrial process where ultra violet photopolymer resin that is curable is used with ultra violet lasers, you can make three dimension components this way. Upon the master pattern being made to the exact specifications of the manufacturer, it will be suspended in a box, room temperature vulcanized silicon is then poured on it so that its encased completely by the silicon.

The silicone has to be allowed time to cure, when completely cured, cuts will be made to allow the retrieval of the master pattern from the mold. When the master pattern is removed from the mold, what forms is a negative image of the latter. Urethane material is poured in the mold, it will harden and the casting is ready. Depending on the type of castings you need, many can be made from the mold. Silicon molds allows for the manufacturer to reuse.

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