Redefining semiconductor sealing: The shift toward fluorosurfactant-free materials

The demand for advanced technologies like AI, 5G networks and high-performance computing is pushing the limits of semiconductor manufacturing. As chip designs continue toward miniaturization, the margins for error shrink to near zero. In this environment, even the most microscopic contamination can negatively affect yield rates and inflate the total cost of ownership.

By Kevin Kaufenberg, Business Development Specialist, Semiconductor, Trelleborg Sealing Solutions

While manufacturers invest in advanced lithography and deposition equipment, they often overlook one of the most critical components safeguarding the process: the polymer seals. Traditional sealing materials struggle to keep pace with the extreme temperatures, aggressive chemistries and strict purity requirements of modern fabrication facilities. Furthermore, a shifting regulatory landscape is forcing the industry to reevaluate the chemical makeup of these essential components. Semiconductor manufacturers therefore need to embrace the next-generation of sealing materials that ensure performance without compromising environmental responsibility.

The hidden vulnerabilities in semiconductor manufacturing
Semiconductor fabrication environments are notoriously hostile. Processes such as plasma-enhanced chemical vapor deposition (PECVD), atomic layer deposition (ALD) and dry etching subject equipment to intense plasma fields, corrosive gases and continuous thermal cycling. Under these extreme conditions, standard elastomeric seals can degrade rapidly.

When seals break down, they release trace metals and generate particulate matter. This outgassing and particle emission directly contaminates the wafer environment. In advanced nodes where features are measured in nanometers, a single particle can ruin an entire chip. The result is unplanned downtime, frequent maintenance intervals and a catastrophic impact on production yield. For semiconductor manufacturers facing the pressures of high-yield demands, minimizing these contamination incidents is not only a technical goal but critical to the bottom line.

Beyond the physical degradation of materials, the industry faces a looming regulatory challenge. Many high-performance fluoroelastomers (FKMs) and perfluoroelastomers (FFKMs) rely on fluorosurfactants during the polymerization process. While effective for manufacturing these complex polymers, fluorosurfactants are facing increasing global scrutiny due to their environmental persistence. Chipmakers are now caught in a difficult position: they must reduce their environmental footprint and regulatory risk without sacrificing the performance required by advanced node manufacturing.

Innovation through fluorosurfactant-free elastomers
The solution may lie in advanced material science. Forward-thinking suppliers recognize that the industry cannot choose between process reliability and environmental compliance. By eliminating fluorosurfactants from the manufacturing process, polymer engineers have developed a new class of sealing materials that meet both demands simultaneously.

These next-generation materials, such as the PureFab® fluorosurfactant-free elastomers developed by Trelleborg Sealing Solutions, set a new standard for purity and stability. They provide an environmentally responsible alternative that improves upon the performance of traditional compounds.

To assess the impact of these materials, it is necessary to examine their performance across three critical dimensions:

• Plasma resistance and extreme purity: In plasma-heavy processes, seal erosion is a constant threat. New unfilled FFKM formulations, such as Isolast® PureFab® JPF50, are engineered without organic or inorganic fillers. This structural purity translates to plasma resistance against a wide range of aggressive chemistries and common thin-film precursors. By exhibiting ultra-low outgassing and minimized particle generation, these high-purity seals significantly reduce contamination risks and help maximize process yields.

• Unyielding temperature stability: Thermal degradation is a primary cause of seal failure in processes like rapid thermal processing (RTP) and diffusion furnaces. Standard elastomers lose their elastic recovery and mechanical strength when exposed to continuous high-heat cycles. Advanced high- temperature FFKMs can now perform at continuous service temperatures up to +572 °F/ +300 °C. Materials engineered for these environments maintain dimensional stability under continuous high loads, resisting the cracking and brittleness that plague lesser polymers. This temperature stability ensures long-term seal integrity, extending the life of critical equipment.

• Cost-efficient chemical resistance: Not every application within a fabrication facility requires the extreme performance, or carries the premium cost, of an FFKM. For transfer modules, load locks and general vacuum handling systems, advanced FKM materials like Trelleborg’s PureFab® VPF 20 offer a highly effective bridge. Formulations utilizing a non- fluorosurfactant base polymer combined with a high-purity synthetic filler system deliver robust mechanical strength and excellent chemical compatibility. They provide a cost-efficient alternative that still upholds the stringent cleanliness requirements of contamination- sensitive environments.

Accelerating time-to-market and reducing total cost of ownership
The transition to fluorosurfactant-free materials is about much more than regulatory compliance. It is a strategic move that directly impacts a manufacturer’s bottom line. When seals resist plasma erosion, withstand extreme temperatures and maintain their integrity against harsh chemicals, the entire manufacturing process becomes more stable.

Equipment front-end modules (EFEM), chamber lids and gas delivery systems can operate for longer periods between scheduled maintenance.

This increased process uptime is a critical success indicator for any fabrication facility. By reducing the frequency of seal replacement, manufacturers lower their direct maintenance costs and eliminate most costs associated with offline tools.

The exceptional purity of these advanced materials ensures that trace metal content and ionic extractables remain virtually nonexistent. This meticulous contamination control, often supported by production in ISO 5 cleanroom environments, directly translates to higher wafer yields. By improving yield rates and extending equipment life, these innovative sealing solutions drastically reduce the total cost of ownership.

Partnering for process excellence
The challenges of modern chip design should not be solved in isolation. As the industry pushes toward smaller nodes and more complex architectures, the physical demands on manufacturing equipment will only intensify. Manufacturers need more than component suppliers; they require engineering partners like Trelleborg that understand the intricate balance of material science, process chemistry and regulatory foresight.

To maximize yield and accelerate time-to-market, chipmakers must evaluate every aspect of their process architecture. Advanced material solutions that eliminate fluorosurfactants while enhancing thermal and chemical resistance represent a vital step forward.