Why Do TCK's SiC Rings Matter More as Etching Becomes More Demanding?

The ring protects processing at the wafer edge. TCK's first-quarter 2026 disclosure explains that a CVD-SiC ring sits outside the wafer and helps improve production yield. Because it is repeatedly exposed to plasma erosion, the component must be replaced after a period of use. It is therefore not simply a permanent part sold once with a chamber. Its economic role combines process stability with a recurring consumables cycle, although the timing of replacement depends on the customer's actual operating conditions.

Silicon carbide offers greater chemical and wear resistance than silicon and is used to extend component life and reduce particle generation. Those qualities can help preserve a cleaner, more uniform process environment. However, there is no universal replacement interval. Etch recipes, plasma intensity, chamber design, maintenance standards, and customer acceptance rules all affect useful life. Fab utilization matters, but it must be interpreted together with how aggressively the component is used and how long it lasts.

Scaling can create harsher process conditions. As semiconductor structures become more complex, manufacturers may need deeper and more precise etching. Longer process times and stronger plasma exposure can raise requirements for chamber-component purity, durability, and dimensional stability. This is the basic path through which more demanding semiconductor processes can support high-specification consumables. The opportunity is not merely that more chips are produced; each process can place more demanding performance requirements on the parts surrounding the wafer.

That change does not guarantee higher sales for every SiC component. The architecture of the equipment adopted by the customer, the specification of the ring, and improvements in component life can all alter order frequency. A tougher process may increase wear, while a more durable product may reduce the number of replacements needed over a given period. The business outcome comes from the balance among installed platforms, process usage, price, product life, and qualified share of applications.

Material technology and machining yield must work together. Producing high-purity material is not enough if a supplier cannot consistently achieve the required dimensions and surface quality. A mass-produced chamber part must fit precisely and perform reliably across repeated manufacturing runs. Material growth, machining, finishing, inspection, and process control therefore contribute together to commercial viability. Customer qualification also evaluates consistency, not just the performance of one successful sample, which makes manufacturing execution an important barrier as specifications become more demanding.

TCK's profitability is shaped by the proportion of higher-specification products and its own manufacturing yields. Sales should be reviewed alongside inventory, capacity expansion, and the associated cost base. There is also a built-in tension in consumables: longer component life benefits the customer and may support product value, but it can reduce replacement frequency. Strong technology creates economic value only when pricing, adoption, usable capacity, and manufacturing yields more than offset that effect.

SiC wafers and SiC rings should not be confused. The company also discusses technology for dummy and monitoring SiC wafers in its disclosures, but those products differ from its core process consumables. They also should not be confused with SiC wafers used for power semiconductors. The same material name can appear across distinct applications, customers, specifications, and market cycles. Applying the growth rate of the power-semiconductor market directly to an etching-ring business would therefore create a misleading comparison.

Domestic development of a new product also proceeds through research and development, customer evaluation, and adoption in mass production. Readers should separate technology that has reached commercialization from future development potential. A prototype or evaluation program may establish technical progress without yet producing repeat revenue. Evidence of customer qualification, production adoption, and sustained orders provides a firmer basis for assessing how much a new application contributes to TCK's actual business.

Solid SiC reached 89.6% of first-quarter sales. TCK's May 15, 2026 quarterly report shows first-quarter sales of KRW 95.392 billion, up from KRW 78.362 billion a year earlier. Solid SiC products generated KRW 85.472 billion, or 89.6% of the total, compared with KRW 7.063 billion from graphite products and KRW 2.517 billion from susceptors. The mix confirms that Solid SiC currently dominates the business.

The sales-support agreement for Solid SiC rings was amended on March 31, 2026 and is scheduled to end on December 31, 2026. An agreement's expiry does not by itself prove an immediate decline in sales, so the next checkpoints are product revenue, repeat orders, inventory, margins, and any replacement commercial arrangement. Those numbers will show whether recurring replacement demand remains durable.

Calculating the paradox of longer component life. If 1,000 installed tools each replace one ring per quarter, extending ring life by 25% can reduce quarterly demand to about 800 units. Even with a 20% price increase, revenue equals only 960 units at the old price, a decline of 4%.

Abandon the lower-demand conclusion if longer etch times or new tool installations more than offset the effect of longer component life.

Installed base, usage intensity, replacement interval, and price must be calculated together to avoid assuming that a higher-performance material always increases revenue.