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Published on June 1, 2004

Liquid Injection Sealing: The gaskets of Now

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Date Published June 1, 2004
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By fastening the two substrates together prior to sealing, a mated fit of the dry surface is achieved. With proper molding, machining or casting of the substrates a channel is created for an injection of gasketing material to follow, similar to the grove for a hand placed compression gasket. The material developed is flowable enough to fill the entire channel with small injection pressures. Once the channel is filled, the material cures in a very short time. This method allows for varying surface irregularities to be accounted for and sealed easily by the material. The material itself is designed to expand upon thermal exposure and exposure to the fluid it is sealing in or out. This swell then puts pressure within the channel and upon the opposing substrates increasing the seal force and enhancing the seal performance. Materials have been designed to seal oils, coolants, water and transmission fluid. Other materials can be designed to meet different and new seal needs.