CIPG vs FIPG: An Industrial Guide

  • Post last modified:January 14, 2026

CIPG vs FIPG: An Industrial Guide to Liquid Gasketing Solutions

In the world of modern manufacturing, the demand for precision, durability, and cost-efficiency is higher than ever. Whether you are assembling automotive engines, sealing high-tech electronics, or constructing industrial enclosures, the integrity of your seals is paramount. Traditional die-cut gaskets, while reliable for decades, are increasingly being replaced by automated liquid gasketing solutions. Two of the most prominent technologies in this space are Formed-in-Place Gaskets (FIPG) and Cured-in-Place Gaskets (CIPG).

Understanding the nuances between CIPG and FIPG is essential for engineers and production managers. While both methods involve dispensing a liquid elastomer onto a component, their curing processes, assembly sequences, and performance characteristics differ significantly. This comprehensive guide explores the technical details, advantages, and ideal applications for both CIPG and FIPG to help you make an informed decision for your production line.

What is Formed-In-Place Gasket (FIPG)?

Formed-In-Place Gasket (FIPG) is a process where a liquid sealant is dispensed onto one of the mating surfaces, and the parts are assembled before the sealant has fully cured. The material cures while the parts are joined, essentially creating a “custom-fit” seal that bonds the two surfaces together.

FIPG materials are typically Room Temperature Vulcanizing (RTV) silicones or anaerobic sealants. Because the assembly happens while the material is still in a liquid or semi-liquid state, the sealant flows into every microscopic irregularity, scratch, or machining mark on the flange surfaces. This results in an incredibly tight, leak-proof seal that can withstand high pressures and vibrations.

The FIPG Process Flow

  • Surface Preparation: Cleaning the flanges to ensure optimal adhesion.
  • Dispensing: A robotically controlled nozzle applies a precise bead of sealant.
  • Assembly: The mating part is placed onto the wet sealant and fastened immediately.
  • Curing: The sealant cures over time (often via moisture in the air or lack of oxygen in the case of anaerobics), forming both a seal and a structural bond.

Key Characteristics of FIPG

FIPG is often characterized by its high adhesion strength. Since it cures in contact with both surfaces, it acts as both a gasket and an adhesive. This makes it ideal for permanent or semi-permanent assemblies where the parts are not expected to be disassembled frequently.

What is Cured-In-Place Gasket (CIPG)?

Cured-In-Place Gasket (CIPG) takes a different approach. In this method, the liquid sealant is dispensed onto a component and then fully cured before the parts are assembled. The result is a solid, elastomeric bead that remains adhered to one surface, acting much like a traditional molded rubber gasket.

CIPG materials are often UV-curable or heat-curable elastomers. Because the gasket is “dry” when the parts are joined, the seal is created through compression rather than chemical bonding to the second surface. This fundamental difference opens up a variety of possibilities for serviceability and maintenance.

The CIPG Process Flow

  • Dispensing: A precise bead of UV or thermal-cure material is applied to the flange.
  • Curing: The bead is exposed to a UV light source or passed through a curing oven, turning the liquid into a solid elastomer in seconds.
  • Assembly: The parts are joined at any time after curing—immediately or even weeks later.
  • Compression: The seal is achieved by mechanically compressing the cured bead between the two mating surfaces.

Key Characteristics of CIPG

The primary characteristic of CIPG is its serviceability. Since the gasket only adheres to one side of the assembly, the parts can be easily separated for repair or maintenance without damaging the gasket or the flange surfaces. It is essentially a “dispensed-to-fit” alternative to pre-molded O-rings or flat gaskets.

CIPG vs FIPG: Key Differences Compared

Choosing between CIPG and FIPG requires a deep dive into your specific production requirements. Below are the critical areas where these two technologies diverge.

1. Assembly Timing and Workflow

The most obvious difference is the “open time.” In FIPG, there is a limited window to assemble the parts before the sealant begins to skin over or cure. If you miss this window, the seal integrity may be compromised. CIPG removes this pressure; once the bead is cured, the component can be stored, shipped, or moved to another station before final assembly.

2. Serviceability and Maintenance

If your product needs to be opened for battery replacement, sensor calibration, or internal repairs, CIPG is the clear winner. Because FIPG bonds both surfaces, separating them often involves prying, which can warp metal flanges or crack plastic housings. Furthermore, the old FIPG material must be painstakingly scraped off before re-sealing. With CIPG, the parts pull apart easily, and the gasket often remains intact and ready for re-compression.

3. Sealing Mechanism

FIPG relies on adhesion and displacement. It fills the gap and “glues” the parts together. CIPG relies on compression and resilience. The cured bead must have a good “compression set” (the ability to return to its original shape) to maintain a seal over the product’s lifespan. This makes material selection for CIPG particularly critical, as the elastomer must withstand constant pressure without flattening out permanently.

4. Production Speed

CIPG, especially when using UV-curable materials, is often faster for high-volume lines. A UV-cured bead can be ready in 5 to 30 seconds. FIPG using RTV silicones might require hours or even days to reach full strength, although “tack-free” times are shorter. However, FIPG allows for immediate assembly, which can be a throughput advantage if the parts don’t need to be pressure-tested immediately.

5. Flange Requirements

FIPG is more forgiving of flange imperfections and wider tolerances because the liquid material is compressed and spread during assembly. CIPG requires more precise control over the bead height and the flatness of the mating surface to ensure uniform compression across the entire seal perimeter.

Material Considerations: Silicones, Acrylics, and Urethanes

The performance of your gasket depends heavily on the chemistry of the material used. Both CIPG and FIPG utilize various polymers, each with specific strengths.

FIPG Materials

  • RTV Silicones: The most common FIPG material. They offer excellent temperature resistance and flexibility but require moisture to cure, which can be slow in deep sections.
  • Anaerobic Adhesives: These cure in the absence of oxygen and the presence of metal ions. They are excellent for rigid metal-to-metal assemblies like engine blocks or gearbox housings.

CIPG Materials

  • UV-Curable Acrylates/Silicones: These are the gold standard for CIPG. They allow for nearly instantaneous curing, which is essential for automated high-speed production.
  • Heat-Cure Elastomers: Used when UV light cannot reach all areas of the gasket or when specific chemical resistance properties are needed that only thermal-cure resins can provide.

When selecting a material, you must consider the operating environment. Will the seal be exposed to oil, coolant, UV light, or extreme temperatures? For specialized advice on material compatibility, you can [Contact Our Team](https://www.incurelab.com/contact) to discuss your specific application needs.

Industrial Applications: Where to Use Which?

Both technologies have carved out niches in various industries based on their unique strengths.

Common FIPG Applications

  • Automotive Engines: Oil pans, timing chain covers, and valve covers often use FIPG because these components are rarely removed and require a high-pressure, leak-proof bond.
  • Heavy Machinery: Large gearboxes and hydraulic reservoirs where a structural, permanent seal is beneficial.
  • Water Pumps: Where the sealant must fill significant gaps and provide long-term resistance to water and glycol.

Common CIPG Applications

  • Electronics Enclosures: Mobile phones, handheld radios, and ECU (Electronic Control Unit) housings. The ability to open the device for repair is critical.
  • EV Battery Packs: Large battery enclosures require long seals that may need to be opened for cell maintenance.
  • Lighting: Automotive headlamps and outdoor architectural lighting where thermal expansion requires a flexible, non-bonding seal.
  • Appliances: Dishwashers and washing machines where components like detergent dispensers or control panels might need servicing.

Advantages and Disadvantages At a Glance

FIPG Pros and Cons

Pros:

  • Superior leak prevention due to “wet” mating.
  • Provides structural integrity (bonds parts).
  • Lower equipment cost (no curing lamps/ovens needed for RTV).
  • Forgiving of surface finish irregularities.

Cons:

  • Difficult to disassemble and service.
  • Requires “open time” management.
  • Longer full-cure times.
  • Potential for “squeeze-out” to contaminate internal components.

CIPG Pros and Cons

Pros:

  • Excellent serviceability (easy to disassemble).
  • No “open time” constraints; parts can be stored.
  • Very fast curing with UV technology.
  • No squeeze-out or internal contamination.

Cons:

  • Requires higher precision in dispensing.
  • Higher initial investment in curing equipment (UV lamps).
  • Requires specific bead profiles to ensure proper compression.

The Role of Automation in Liquid Gasketing

Regardless of whether you choose CIPG or FIPG, the success of the application depends on the precision of the dispensing system. Manual application is rarely sufficient for industrial standards. Automated dispensing systems ensure:

  • Consistent Bead Volume: Prevents leaks caused by thin spots or waste caused by over-dispensing.
  • Path Accuracy: Ensures the bead is placed exactly in the center of the flange, even on complex 3D geometries.
  • Speed: Robotic systems can move at high speeds, keeping pace with modern assembly lines.

For CIPG, the automation must also integrate the curing cycle. This often involves a conveyorized UV system or a robotic arm that moves the part under a stationary UV lamp. The integration of “Vision Systems” is also becoming common, allowing the robot to adjust the dispensing path in real-time based on the part’s actual position.

How to Choose: A Decision Framework

If you are struggling to decide between CIPG and FIPG, ask your engineering team the following five questions:

  1. Does the part need to be serviced? If yes, CIPG is almost always the better choice.
  2. Is the assembly rigid or flexible? Rigid metal assemblies often favor FIPG (anaerobics), while plastic housings that might flex favor the elasticity of CIPG.
  3. What is the production cycle time? If you need to process thousands of parts per hour, the instant cure of UV-CIPG is advantageous.
  4. What are the pressure requirements? FIPG generally handles higher internal pressures because of its dual-surface bonding.
  5. What is the budget for capital equipment? FIPG (RTV) has a lower entry cost, whereas CIPG requires curing infrastructure.

The Future of Liquid Gasketing

As sustainability becomes a core focus in manufacturing, both CIPG and FIPG are evolving. We are seeing a shift toward “Green” chemistries—materials with low VOC (Volatile Organic Compound) emissions and those that do not require hazardous primers. Additionally, the rise of Electric Vehicles (EVs) is driving massive growth in the CIPG market, as large-scale battery trays require serviceable, high-performance seals that can withstand environmental exposure for over a decade.

Furthermore, the development of “Hybrid” materials is on the rise. These materials might offer the high adhesion of an FIPG with the faster curing times of a CIPG, or dual-cure mechanisms (UV + Moisture) to ensure that even “shadowed” areas where light cannot reach are fully cured.

Conclusion

In the debate of CIPG vs FIPG, there is no universal “winner.” The choice depends entirely on your product’s design, the required serviceability, and your production environment. FIPG remains the powerhouse for permanent, high-pressure industrial and automotive seals. Meanwhile, CIPG is the modern solution for complex electronics, serviceable enclosures, and high-speed automated assembly.

By understanding the mechanical and chemical differences between these two methods, manufacturers can reduce waste, improve product reliability, and lower total cost of ownership. Whether you are sealing a simple plastic cover or a complex aerospace component, choosing the right liquid gasketing strategy is a critical step toward engineering excellence.

If you are looking to optimize your sealing process or need assistance selecting the right UV-curable materials for your next project, our experts are here to help. We provide high-performance solutions tailored to the most demanding industrial requirements.

Visit [www.incurelab.com](https://www.incurelab.com) for more information.