CIPG: An Industrial Guide

  • Post last modified:January 14, 2026

CIPG: An Industrial Guide to Cured-In-Place Gaskets

In the rapidly evolving landscape of industrial manufacturing, the demand for precision, efficiency, and reliability in sealing solutions has never been higher. Traditional sealing methods, such as pre-cut rubber gaskets or manual adhesive application, are increasingly being replaced by more advanced, automated technologies. One of the most significant advancements in this field is the Cured-In-Place Gasket, commonly known as CIPG. This industrial guide provides a deep dive into CIPG technology, exploring its chemistry, application processes, advantages, and its critical role in modern engineering.

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

CIPG refers to a sealing process where a liquid elastomer is dispensed onto a component’s sealing surface and then fully cured—typically via ultraviolet (UV) light or heat—before the parts are assembled. Unlike Form-In-Place Gaskets (FIPG), which are assembled while the material is still wet or in a semi-liquid state, CIPG results in a solid, resilient elastomer that behaves like a traditional molded gasket but is produced directly on the part.

The primary goal of CIPG is to create a high-performance seal that can withstand environmental stressors such as moisture, dust, automotive fluids, and temperature fluctuations. Because the gasket is cured before assembly, it allows for the “compression” of the seal during the final joining of components, providing a reliable mechanical barrier that is easily serviceable.

The Core Difference: CIPG vs. FIPG vs. FIPJ

To understand CIPG, it is essential to distinguish it from related technologies:

  • CIPG (Cured-In-Place Gasket): The material is dispensed and cured into a solid state before assembly. It creates a compression seal.
  • FIPG (Form-In-Place Gasket): The material is dispensed, and the parts are joined while the material is still wet. The gasket cures inside the joint, often acting as both a seal and an adhesive.
  • FIPJ (Form-In-Place Joint): Often used interchangeably with FIPG, but specifically refers to the joint geometry where the sealant fills a specific cavity to bridge gaps.

The Science of CIPG Materials

The performance of a CIPG seal is fundamentally tied to the chemistry of the material used. Industrial manufacturers typically choose between several types of high-performance elastomers based on the specific requirements of the application.

1. UV-Cured Acrylates and Silicones

UV-cured materials are the gold standard for high-volume CIPG applications. These materials contain photoinitiators that react instantly when exposed to specific wavelengths of UV light. This allows for “curing on the fly,” where a gasket can be dispensed and cured in seconds, enabling incredibly fast cycle times. UV-CIPG materials offer excellent compression set resistance and can be formulated to be soft or rigid depending on the sealing pressure required.

2. RTV (Room Temperature Vulcanizing) Silicones

RTV silicones are common in applications where UV light cannot reach all areas of the gasket (shadowed areas). While they offer excellent thermal stability and chemical resistance, they require longer cure times—often hours or days—unless moisture or heat is used to accelerate the process. In a CIPG context, RTVs are less common than UV materials due to the throughput bottlenecks they create.

3. Polyurethanes

Polyurethane CIPG materials are often used for their toughness and abrasion resistance. They are frequently found in heavy-duty industrial enclosures. However, they may require more careful environmental control during the dispensing process to manage moisture sensitivity.

Key Advantages of CIPG Technology

Why are industries shifting toward CIPG? The benefits span across design flexibility, cost reduction, and product longevity.

1. Elimination of Gasket Inventory

In traditional manufacturing, companies must stock thousands of different pre-cut gaskets for different part numbers. This leads to high inventory costs, the risk of gaskets drying out or warping in storage, and the logistical nightmare of managing SKU proliferation. With CIPG, the “gasket” is simply a drum or cartridge of liquid material. The same material can be used for hundreds of different part geometries, significantly streamlining the supply chain.

2. Superior Design Flexibility

CIPG allows engineers to design complex, 3-D sealing paths that would be impossible or prohibitively expensive to create with die-cut gaskets. Automated dispensing robots can follow intricate grooves and varying heights, ensuring a perfect fit every time. This is particularly useful in the electronics and automotive sectors, where space is at a premium and components are increasingly compact.

3. Reduced Material Waste

Die-cutting gaskets from sheets of rubber results in significant “scrap” material—often up to 50% of the original sheet. CIPG is an additive process; the robot dispenses exactly the amount of material needed for the seal, with virtually zero waste. This not only lowers material costs but also supports corporate sustainability goals.

4. Enhanced Sealing Integrity

Because CIPG is applied as a liquid, it wets the surface of the substrate perfectly, filling in microscopic surface irregularities before it cures. This creates a more intimate contact than a pre-cut gasket, which may have “micro-gaps” due to surface roughness. Once cured, the CIPG elastomer provides consistent compression across the entire sealing surface.

5. Serviceability

Since the gasket is cured before the parts are mated, it does not bond the two parts together. This makes the assembly “serviceable.” If a device needs to be opened for repair or battery replacement, the parts can be separated without destroying the gasket or requiring the scraping of adhesive residues. In many cases, the CIPG seal remains intact and can be reused or easily replaced.

The CIPG Manufacturing Process

Implementing a CIPG line requires a synchronized dance between material science and robotics. The process generally follows these four steps:

Step 1: Surface Preparation

For the gasket to remain in place during the life of the product, it must adhere well to the substrate. Surfaces must be clean of oils, dust, and release agents. In some high-performance applications, plasma or corona treatment is used to increase the surface energy of plastics like polypropylene, ensuring the liquid bead doesn’t “bead up” or shift before curing.

Step 2: Precision Dispensing

An automated dispensing system (usually a 3-axis or 6-axis robot) applies the liquid material. The key here is consistency. The bead width and height must be maintained within tight tolerances (often +/- 0.1mm). Advanced systems use “vision-guided” dispensing to compensate for slight variations in part positioning.

Step 3: Curing

This is the defining step of CIPG. For UV-cured materials, the part passes under a high-intensity UV lamp (LED or Mercury vapor). Within seconds, the liquid transforms into a solid elastomer. If using heat-cure materials, the parts pass through an oven. The goal is to achieve a 100% cure so that the part can be handled or moved to the next station immediately.

Step 4: Quality Inspection

Modern CIPG lines often incorporate automated optical inspection (AOI). Cameras scan the cured bead to check for “breaks” in the gasket, air bubbles, or deviations in bead thickness. This ensures that every part leaving the line is guaranteed to be leak-proof.

Critical Design Considerations for CIPG

To maximize the effectiveness of a Cured-In-Place Gasket, engineers must consider several design factors during the prototyping phase.

Compression Set

Compression set refers to the permanent deformation of an elastomer after being compressed. If a material has a high compression set, it will “flatten out” over time and lose its sealing force. For CIPG, it is vital to select materials with low compression set values, especially in environments with high thermal cycling.

Groove Design

While CIPG can be applied to flat surfaces, it is most effective when dispensed into a groove. The groove helps contain the material during dispensing and provides a “stop” to prevent the gasket from being over-compressed during assembly. A general rule of thumb is to design for 10% to 30% compression of the gasket height.

Adhesion vs. Release

In some applications, you want the CIPG to stick permanently to one side of the assembly (the “carrier” side) but release easily from the “mating” side. This is achieved by choosing the right material for the carrier side and ensuring the mating surface has a lower surface energy or a smoother finish.

Industrial Applications of CIPG

The versatility of CIPG has led to its adoption across a wide spectrum of industries.

Automotive Industry

In the automotive sector, CIPG is used extensively for Electronic Control Units (ECUs), sensors, and lighting assemblies. With the rise of Electric Vehicles (EVs), CIPG has become critical for sealing battery enclosures and power conversion modules, where protection against moisture ingress is a safety-critical requirement.

Electronics and Telecommunications

From smartphones to outdoor 5G base stations, CIPG provides the IP67 or IP68 waterproof ratings consumers and industries demand. The ability to dispense incredibly thin beads (under 1mm) allows for sleek product designs without sacrificing environmental protection.

Medical Devices

Medical equipment often requires frequent sterilization and protection from fluids. CIPG materials that are biocompatible and resistant to harsh cleaning chemicals are used to seal diagnostic equipment and handheld surgical tools.

Aerospace and Defense

In aerospace, weight reduction is paramount. By replacing heavy mechanical seals and hardware with lightweight CIPG beads, manufacturers can shave off critical grams while ensuring electronic bays remain pressurized and protected from high-altitude environments.

Challenges and Troubleshooting

While CIPG is highly efficient, it is not without its challenges. Common issues include:

  • Air Entrapment: Air bubbles in the liquid material can lead to “voids” in the cured gasket, creating potential leak paths. This is usually solved by using degassed materials and high-quality dispensing valves.
  • Shadowing: In UV curing, if the gasket is dispensed in a deep, narrow channel, the “walls” of the channel might block the UV light. This requires careful positioning of UV lamps or the use of “dual-cure” materials (UV + Moisture).
  • Viscosity Fluctuations: Changes in ambient temperature can change the viscosity of the liquid, affecting the bead size. Temperature-controlled dispensing heads are often used to mitigate this.

The Future of CIPG

As manufacturing moves toward Industry 4.0, CIPG technology is becoming even more integrated. We are seeing the rise of “smart” dispensing systems that use AI to predict when a nozzle might clog or when material properties are drifting. Furthermore, the development of more sustainable, bio-based UV resins is helping manufacturers reduce their carbon footprint without compromising on seal performance.

The transition from traditional gasketing to CIPG is not just a change in material; it is a shift in manufacturing philosophy. By moving the creation of the seal to the point of assembly, companies gain unprecedented control over quality, cost, and design.

Conclusion

CIPG (Cured-In-Place Gasket) technology represents the pinnacle of modern sealing solutions. By combining the precision of robotics with the rapid curing of advanced polymers, it offers a reliable, cost-effective, and flexible alternative to traditional gaskets. Whether you are sealing a high-voltage EV battery or a delicate medical sensor, understanding the nuances of CIPG—from material selection to groove design—is essential for any industrial engineer looking to stay competitive in today’s market.

If you are looking to implement CIPG technology in your production line or need expert advice on material selection for your specific application, our team of specialists is ready to assist you in optimizing your sealing process.

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