When a Single Part Brings the Entire Plant to a Halt — Why Gaskets Matter in Plate Heat Exchangers > Technical Resources

When a Single Part Brings the Entire Plant to a Halt — Why Gaskets Matter in Plate Heat Exchangers

Plate heat exchanger gaskets are critical components that seal the space between heat transfer plates, preventing the mixing of the two fluids. VISER, a company specializing in the manufacture of plate heat exchangers and gaskets, explains the role of gaskets, the criteria for selecting materials, and the risks associated with choosing the wrong gasket material.

Write : Heesoo Lim, Vice President  ·  Date : 2026.08.04  ·  Category : Tech Insight

[Hypothetical scenario] Consider the case of a food processing plant. A gasket on a plate heat exchanger in a new production line was replaced with a cheaper alternative without a proper review of process conditions. Problems arose a few months later; the gasket rubber gradually hardened and developed micro-cracks due to repeated exposure to chemicals during the Clean-in-Place (CIP) process. One morning, a quality inspection revealed an issue on the production line: the seal between the cooling water system and the product system had failed, leading to fluid cross-contamination. The consequences included the disposal of the entire affected batch, a production line shutdown, and significant losses incurred during the root cause investigation, cleaning, and re-validation processes. Had the issue gone undetected and the products been shipped, the company would have faced even greater costs, such as a product recall and damage to its brand reputation.

While this is a hypothetical scenario, it is by no means an exaggeration in an industrial setting. This is because the performance and safety of the entire plate heat exchanger unit hinge on a single, inconspicuous rubber component. Together with VISER—a company that designs and manufactures both plate heat exchangers and gaskets—we explore why gaskets are critical and the criteria used to select them.

What is the role of a plate heat exchanger gasket?

Plate heat exchanger gaskets are rubber components that maintain a uniform gap between stacked heat transfer plates and seal the flow channels; they are critical elements that ensure heat is exchanged between two fluids while keeping them completely separated. Proper gasket function prevents the mixing of particulates, impurities, and chemicals, maintains the purity of each fluid, and ensures effective heat transfer.

In summary, gaskets serve three functions: maintaining the gap between heat transfer plates and forming flow channels; completely separating the two fluids and preventing external leakage; and, as a result, ensuring heat exchange performance and fluid cleanliness. Although gaskets are consumables, their quality directly determines the quality of the entire heat exchanger.

What happens if the wrong gasket is selected?

If the gasket material is incompatible with operating conditions, the rubber undergoes premature degradation. Exceeding temperature limits leads to hardening and permanent compression set (permanent deformation), resulting in reduced sealing performance; conversely, chemical incompatibility with the contacting fluid causes swelling, cracking, and leaching. These consequences manifest progressively.

It begins with minor leakage and a decline in heat exchange efficiency. Subsequent cross-contamination between fluids leads to product contamination and waste in the food and pharmaceutical industries, and to process anomalies and equipment corrosion in the chemical and power generation sectors. Ultimately, the consequences can escalate to include production losses from unplanned shutdowns, emergency maintenance costs, and even safety risks. It is a scenario where attempting to save a small amount on gasket costs results in losses hundreds of times greater.

What criteria are used to select gasket materials?

The criteria for selecting gasket materials for plate heat exchangers can be summarized into four categories: ① operating temperature (continuous and maximum temperatures), ② operating pressure, ③ chemical properties of the fluid in contact (chemical resistance), and ④ operating environment (e.g., food and hygiene requirements, outdoor installation). Since the physical properties of rubber vary depending on the formulation, it is necessary to evaluate both the general characteristics of the material group and the manufacturer's formulation technology.

Visor works with a wide range of rubber materials—including NBR, HNBR, IIR, CR, FKM, EPDM, and VMQ—and employs an integrated design approach that matches heat transfer plate specifications and gasket materials to the specific operating conditions and fluid characteristics of the heat exchange process. Notably, Visor’s NBR and EPDM gaskets intended for food-contact applications have been certified as compliant with FDA 21 CFR 177.2600 standards. Properly selected gaskets ensure that plate heat exchangers operate efficiently and safely across high-temperature, high-pressure, and corrosive environments, as well as in food-processing applications.

Gasket Management Is Also a Matter of Performance — A Maintenance Perspective

As gaskets are consumables with a defined replacement cycle, a robust after-sales support system is just as critical as the initial selection process. Regular inspections allow for the early detection of signs such as hardening, cracking, and permanent compression set, thereby preventing unplanned shutdowns. Visor supports the entire lifecycle of the heat exchanger—including gasket replacement—by offering a two-year product warranty, a ten-year guarantee on spare parts availability, and a service framework that ensures an initial response within four hours of a request and an on-site inspection within 24 hours.