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Intake manifold is a part of an engine that supplies fuel/air mixture to the cylinder heads. Recently, silicone FIPG has been used for the two part design of the intake manifold. It is known that a small, but significant, amount of gasoline fuel can penetrate through silicone FIPG layer due to the flexible nature of the siloxane backbone. Since gasoline permeation is becoming more important because of more severe regulations, it is found that a new polyacrylate based FIPG dramatically reduces the gasoline fuel permeation. This study compares this new technology, polyacrylate FIPG sealant with silicone FIPG sealant used today for vehicle powertrain gasketing applications. Adhesion investigation on both aluminum and magnesium alloys, and oil resistance are also discussed in this study.

In response to OEM needs and industry trends within the powertrain gasketing segment, a next generation FIPG liquid sealant is being introduced. These needs and trends include a robust and low-cost sealing solution, improved long-term hot-oil resistance, increased permeability resistance of materials to meet low emissions vehicle (LEV) requirements, extended open times, and oil foaming issues. A new compound based on polyacrylate (ACM) rubber has been successfully proven as a sealant for FIP gasketing. The following paper will compare this new technology to FIPG liquid sealants used today for vehicle powertrain gasketing applications.