Cure-in-Place Gaskets (CIPG)
CIPG is a sealing technology that involves applying a liquid gasket material onto a surface, where it cures or solidifies in place before the assembly is closed. This method is commonly used where precise, complex shapes are required for effective sealing, and the liquid gasket material typically consists of a polymer base and curing agents.
Key characteristics of CIPG include its ability to conform to irregular surfaces, creating a customized, seamless seal. This technology is known for its resistance to a wide range of temperatures, chemicals, and environmental conditions. The cured gasket provides reliable, durable sealing, making it well suited to applications in automotive engines, gearboxes, and other critical components.
CIPG Chemistry Comparison
Polyurethane
Two-part sealants that, once mixed and cured, transform into thick solids or foams with excellent elongation and adhesion. They adhere well to metals, plastics, and composites, and resist dilute acids, bases, and light oils. Hardness ratings generally range from 20 (Shore 00) to 60 (Shore A).
Silicone (RTV)
Solvent-free, one- or two-component sealants that cure at room temperature, with heat, or under UV exposure. They offer gap-filling capability up to 6mm and generally adhere without a primer. Effective across a wide continuous temperature range with brief tolerance for higher peaks, RTV silicones resist common oils and coolants and hold up well against weathering, vibration, moisture, and ozone.
Dual-Cure Silicone: Certain cure-in-place silicone gasket sealants use a dual-cure mechanism. A rapid UV cure establishes the bead with enough strength for assembly, followed by a moisture cure that continues even in shaded areas the light can't reach, allowing effective cure to depths up to 6mm.
Limitations of RTV Silicone: RTV silicones have relatively poor resistance to fuel and aromatic solvents, and their lower tensile and shear strength may make them a weaker fit for heavily stressed or high-pressure sealing applications.
Form-in-Place Gaskets (FIPG)
FIPG is valued for its flexibility and adaptability, conforming seamlessly to the unique shapes and contours of mating surfaces. This not only ensures precision during application but also minimizes the risk of misalignment, contributing to a consistently reliable seal.
FIPG offers versatility through a range of material options, allowing customization based on specific application requirements; commonly used materials include silicone, rubber, and other elastomers, each providing distinct properties tailored to different sealing needs. Curing typically takes place in situ as the assembly is completed, and the specific process may involve moisture curing, heat curing, or a combination of both, depending on the formulation.
FIPG is often preferred for its ability to automate the gasket application process, reducing labor costs and ensuring consistent results. Like CIPG, FIPG materials are typically liquid or semi-liquid at the time of application and solidify to form a resilient gasket, offering excellent adhesion to a wide range of surfaces and seeing extensive use across electronics, appliances, and machinery.
FIPG is particularly well suited to intricate assemblies, such as automotive engines, electronic enclosures, and industrial machinery. The choice of FIPG material is determined by factors such as temperature requirements, chemical compatibility, and the specific conditions of the application.
Gasket Sealant Applications
CIPG and FIPG are used across a variety of applications, including automotive and electrical components.
Automotive
CIPG and FIPG are extensively used in the automotive industry for sealing engine components, oil pans, transmission housings, and other critical assemblies. Their ability to withstand temperature variations and resist automotive fluids makes them indispensable in this sector.
Electronics
In electronic manufacturing, CIPG and FIPG are used for sealing and insulating electronic components. These gaskets protect against moisture, dust, and environmental contaminants, supporting the reliability of electronic devices.
Need Help Selecting the Right Gasketing Sealant?
Chemistry selection depends on your assembly method, substrate, chemical exposure, and service temperature. Our technical team provides product selection support, trial quantity sourcing, and application guidance across CIPG and FIPG polyurethane and silicone systems.
CIPG vs FIPG – Quick Reference
CIPGCured before assembly; disassembly-friendly
FIPGCured in situ during assembly; automatable, permanent
