Liquid Rubber – Applications, Process And More

Applications of Liquid Rubber

The process of injection molding is used with liquid rubber to produce elastic parts, according to J. A. Lindsay author of the book, Rubber Injection Molding. One of the most important properties of liquid rubber is that it is highly resistant to both low and high temperatures and chemicals, and has good chemical properties and high transparency. It is used in sectors like household appliances, medical devices, automotive parts, food, electronics and others.


An injection molding machine is used to process this material fully and automatically. Liquid rubber consists of silicon with a low viscosity, and also has a paste-like consistency or appearance. But it appears solid in a state of quiescent, and it is important to notice that the viscosity of this construction material under shear becomes as slow as that we see in syrup. A low clamping force is used by an injection molding machine, along with a high pressure mound with a cold runner. The whole process is waste free and fully automatic. A single person can supervise the entire process alone without needing a supervisor, post treatment of the moldings that are produced, change some parameters, and other things.

Drum containers pump liquid rubber to a dynamic or static mixer, and here the two components are mixed. The dosing cylinder receives the mix of this construction material in the injection machine. A cold runner system injects the liquid rubber into a hot mold. These molds should be equipped with cutting-edge technology to avoid problems for processors without lots of experience working with liquid rubber. The cold runner´s tip uses needle valve-operated nozzles that are shut off or open. The nozzles have between 1 to 64 or more cavities.

Fast Cure and Cost Reduction

This material can decrease cycle times by 20 to 30%, according to the 1999 Rubber Conference. Equipment using the latest technology of molding can decrease cycle times by 70%. As you can see, there is no doubt that the use of liquid rubber for molding has a huge impact in the reduction of costs and capacity. It is possible to produce parts with a reduction of flashes thanks to faster curing material, and the no post-cure properties will be improved as well. Co-molding using thermoplastics is possible with the use of fast-curing compositions, and this is a very interesting and new possibility as well. It is possible to find liquid rubber in X-Ray opaque as well.

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