The Application of Seals in the Semiconductor Industry: Precision Sealing Safeguards High-End Manufacturing

As the core cornerstone of the electronic information industry, the semiconductor manufacturing process imposes extremely stringent requirements on environmental cleanliness, medium compatibility, temperature stability, and sealing performance. From chip design and wafer fabrication to packaging and testing, every link is inseparable from the support of sealing technology. As key basic components, seals not only perform the core functions of isolating contaminants and preventing medium leakage but also directly affect the yield, reliability, and service life of semiconductor products, becoming indispensable "invisible guardians" in high-end semiconductor manufacturing.

I. Special Requirements for Seals in the Semiconductor Industry

The particularity of semiconductor manufacturing environments and processes determines that seals must meet a series of rigorous standards, far exceeding those of ordinary industrial scenarios:

Ultra-High Cleanliness Compatibility

Wafer fabrication is conducted in Class 1-10 cleanrooms. Seals must have extremely low particle emission (no dust or fiber shedding) to avoid contaminants adhering to the wafer surface, which could cause circuit short circuits or performance failure.

Strong Medium Compatibility

The manufacturing process involves various media, including high-purity gases (e.g., nitrogen, argon, hydrogen), corrosive chemicals (e.g., hydrofluoric acid, ammonia, photoresist), and ultrapure water. Seals must resist erosion from these media without swelling, aging, or leaching, ensuring medium purity and sealing effectiveness.

Wide Temperature and Pressure Adaptability

Semiconductor manufacturing includes processes such as thin-film deposition, etching, and annealing, with a temperature range covering -40℃ to over 300℃.

Plasma and Radiation Resistance

In processes like dry etching and plasma cleaning, seals are exposed to high-energy plasma and radiation environments. They must possess excellent plasma erosion resistance to prevent surface degradation or the generation of harmful substances that contaminate the process environment.

Dimensional Precision and Long-Term Stability

Seals must have dimensional tolerances controlled at the micron level to meet the assembly requirements of precision equipment. Meanwhile, they need to have an extended service life to reduce downtime losses caused by frequent replacements and lower production costs.

II. Specific Applications of Seals in Core Semiconductor Processes

(I) Wafer Fabrication: Sealing Ensures Process Purity and Stability

(II) Packaging and Testing: Sealing Enhances Product Reliability and Environmental Adaptability

The core of chip packaging and testing is to protect chips from external environmental impacts while ensuring the stability of electrical connections, where seals play a pivotal role.

(III) Auxiliary Systems and Equipment: Sealing Guarantees Overall Operational Safety

Auxiliary systems and equipment in semiconductor manufacturing also rely on seals for stable operation:

Gas Delivery Systems

Metal seals (e.g., copper gaskets, aluminum gaskets) and perfluoroelastomer (FFKM) seals are used in storage and delivery pipelines, valves, and cylinder interfaces for high-purity process gases (e.g., nitrogen, hydrogen, rare gases). These seals ensure no gas leakage or contamination, safeguarding process stability and operational safety.

Cooling and Temperature Control Systems

Semiconductor equipment generates significant heat during operation, requiring cooling media such as cooling water and oil for temperature reduction. Seals are used to seal cooling pipelines, heat exchangers, and equipment cooling chambers to prevent leakage of cooling media. They must also resist erosion and temperature fluctuations (e.g., -20℃~100℃) from the cooling media, with common materials including nitrile rubber (NBR) and fluororubber (FKM).

Vacuum Systems

In addition to process chambers, high-vacuum seals (e.g., bellows seals, metal O-rings) are used in vacuum pumps, vacuum valves, and other equipment to ensure the sealing performance and operational efficiency of the vacuum system, providing a stable vacuum environment for wafer fabrication.

III. Mainstream Materials and Development Trends of Seals in the Semiconductor Industry

(I) Mainstream Materials and Their Characteristics

FFKM: Known as the "king of seals," it exhibits exceptional chemical inertness and can withstand almost all corrosive media in semiconductor processes. It is widely used in critical components such as reaction chambers and valves.

FKM: Offers excellent corrosion and high-temperature resistance (-20℃~200℃) at a lower cost than FFKM. It is suitable for moderately harsh process scenarios such as wet etching tanks and cooling systems.

PTFE: Boasts extreme chemical stability and resistance to high and low temperatures (-200℃~260℃), with extremely low particle emission. However, its elasticity is poor, so it is usually fabricated into composite seals with PTFE-coated rubber for sealing high-cleanliness, highly corrosive pipeline interfaces and valves.

VMQ: Features good elasticity and low-temperature resistance (-60℃~150℃) with low particle emission. It is suitable for high-cleanliness scenarios with mild media, such as chamber sealing in lithography equipment and test fixture sealing.

(II) Development Trends

Higher Cleanliness and Low Leaching: As semiconductor processes advance to 3nm and beyond, requirements for seals’ particle emission and metal ion leaching are becoming more stringent. Future efforts will focus on developing leach-free, ultra-clean sealing materials and molding processes.

Enhanced Adaptability to Extreme Environments: To meet the demands of new processes with higher temperatures, pressures, and corrosiveness, new sealing materials with improved plasma resistance, ultra-high temperature resistance (above 400℃), and strong corrosion resistance will be developed.

Integration and Customization: Driven by the miniaturization and precision of semiconductor equipment, seals will evolve toward integrated designs (e.g., integrated sealing assemblies). Meanwhile, customized sealing solutions will be provided to meet the personalized needs of different process equipment.

Translation Notes:

Terminology Standardization: Industry-specific terms are consistently translated  "FFKM" "PTFE"  with abbreviations retained after first mention, aligning with international technical communication conventions.

Sentence Logic Optimization: Complex Chinese run-on sentences are split into coherent English clauses using conjunctions (e.g., "to," "while," "which") to improve readability, while preserving the original logical relationships.

Precision of Technical Data: Temperature ranges (-40℃~300℃), cleanroom classes (Class 1-10), and process nodes (3nm) are retained in their original format to ensure technical accuracy.

Contextual Adaptation: Expressions like "invisible guardians" to convey the metaphorical meaning in English, avoiding literal translations that would sound awkward.

Consistent Tone: A formal, objective tone is maintained throughout to match the technical documentation style, suitable for industry reports or professional communications.