Packing and Sealing: What Type of Gasket to Use According to Pressure, Fluid and Temperature

The proper functioning of many industrial processes depends on something seemingly simple yet crucial: a suitable gasket. Industrial sealing gaskets prevent leaks of gases or liquids, ensure operational safety, protect equipment, and optimize the performance of systems operating under pressure, temperature, and chemicals of all kinds. However, not all gaskets are suitable for every application, and a poor choice can lead to leaks, unscheduled maintenance, or even critical failures.

Choosing the right type of gasket requires a thorough understanding of the operating conditions. A gasket designed for an abrasive fluid won't perform well in a steam system. A rubber gasket used with acids could fail prematurely if it lacks adequate chemical resistance. And a gasket meant to withstand high temperatures may not seal properly if it's not sized for the system pressure.

First, it's important to understand that the fluid being transported directly affects the gasket material. Sealing water, compressed air, industrial oils, fuels, steam, acids, or solvents is not the same. Each substance has chemical properties that can attack or degrade certain materials, making it crucial to know the gasket's chemical compatibility.

Temperature is another key factor. Gaskets made with common rubbers like NBR or Neoprene work well up to 100°C, but processes exceeding 200°C require materials such as expanded graphite, mica, mineral fibers, or combinations with stainless steel. A gasket that cannot withstand the temperature can harden, soften, or even char, losing its sealing function entirely.

Pressure also determines the type of gasket to use. In low-pressure applications, rubber, compressed cardboard, or economical spiral-wound gaskets can be used. However, when working with medium or high pressure, especially in boilers, steam systems, or reactors, a high-performance solution is required, such as metal-reinforced graphite gaskets, cam profile gaskets, or stainless steel spiral-wound gaskets.

In addition to the material, the geometry and type of cut directly influence the effectiveness of the seal. Gaskets can be flat, ring-shaped, oval, RTJ-type, or custom-made. Some include internal reinforcements, non-stick coatings, or multiple layers to improve their performance under extreme conditions.

Another important aspect is the environment where the gasket is installed. In areas exposed to the elements, humidity, UV rays, or aggressive agents, it is recommended to use materials resistant to aging and oxidation, such as EPDM or graphite. In food environments, however, FDA-approved materials, such as certain types of silicone or PTFE, should be used.

Choosing the right seal depends not only on the available catalog but also on technical knowledge of the actual operating conditions. Most failures in industrial seals are not due to material defects but to incorrect selection regarding the fluid, temperature, pressure, or installation.

At Suimtec, we work with a wide range of industrial gaskets made from materials such as rubber, fiber, graphite, PTFE, spiral wound gaskets, and special gaskets for high temperature or high pressure. We also offer custom manufacturing and technical consulting to ensure each client has a solution tailored to their system.

Good packaging is not just an accessory. It's a critical component that defines the performance, safety, and durability of a process. Choosing the right packaging can mean the difference between reliable equipment and equipment that fails at the worst possible moment.