The artificial intelligence boom is not only about data centres, graphics processors, and billion-dollar model training runs. It is also about the much quieter materials that keep the chips inside those machines alive. One of the world's most important suppliers of those materials has now placed a large bet on the next decade of demand.

On Friday, 9 October 2026, Sumitomo Bakelite, the Tokyo-based Japanese chemicals group, announced that it will expand production capacity for advanced semiconductor encapsulation materials at two of its Asian plants: Suzhou in China and Singapore. New production lines will be installed at both sites to manufacture the company's SUMIKON EME mold underfill materials, the resins that protect the most advanced chips used in generative AI systems and communications satellites.

The announcement lands at a moment when advanced chip packaging has quietly become one of the semiconductor industry's most important bottlenecks, and when Japanese materials suppliers are racing to add capacity across Asia to keep pace with surging demand.

Background: the quiet chemicals behind the AI boom

Every modern chip is a sandwich of extraordinarily fragile components. A silicon die, the sliver of processed silicon that does the actual computing, cannot simply sit exposed to air, moisture, and mechanical shock. It must be protected, bonded to its substrate, and connected to the outside world through hundreds or thousands of tiny electrical contacts. That protection job belongs to encapsulation materials, a family of specially engineered epoxy resins and molding compounds.

Sumitomo Bakelite is one of the world's leading suppliers of these materials. Its encapsulation compounds have been used across the industry for decades, and the company operates molding-compound plants across Asia, including Japan and China. In June 2026, the company had already announced a first round of new production lines for its Suzhou facility, with capacity additions targeted by the end of 2028. The latest announcement is therefore the second expansion of its Chinese operations in under four months, a cadence that underlines how fast demand is moving.

The broader context is a wider wave of investment by Japanese chemical and electronics companies in Asian semiconductor markets, covering everything from photoresist developers to electronic substrate materials. Growing demand from AI chips, advanced packaging, and high-performance computing is turning semiconductor materials into one of the most competitive investment areas in Japanese industry.

What Sumitomo Bakelite announced

The company said it will add production lines for mold underfill materials and compression-molding granules at its facilities in Suzhou, in eastern China's Jiangsu province, and in Singapore. According to the company's statement, the new lines will make its SUMIKON EME mold underfill materials, products designed to fill the gaps beneath a chip and seal the whole package in a single molding step.

The two sites have different timelines. At Suzhou, the new lines will be installed as part of an expansion of a plant that was completed in 2024, with production from the new capacity scheduled to begin in fiscal year 2030. In Singapore, the new lines will be added to the existing facility, with output expected to start at the end of fiscal year 2028, around March 2029.

Once the lines are running, the company estimates that its capacity for mold underfill materials will roughly double from current levels, while capacity for compression-molding granules will roughly triple. The company said the move is aimed at rising demand for advanced chips used in generative AI and communications satellites, particularly in China and Southeast Asia. Singapore's role is also notable: the city-state has been positioning itself as a semiconductor hub, a trend reflected in recent policy moves there, as covered in our reporting on Singapore's economic outlook.

The company's statement did not include an investment figure. Industry outlet SemiMedia reported the investment at approximately 10 billion yen, or about 63.2 million dollars. Sumitomo Bakelite said the expansion would strengthen its supply of encapsulation materials across Japan, China, and Southeast Asia.

What encapsulation and underfill actually do

For readers unfamiliar with chip manufacturing, encapsulation is the protective shell of the semiconductor world. When a chip die is attached to its package substrate, the space between the die and the substrate, and around the delicate solder bumps that connect them, must be filled with material. This is underfill. It absorbs mechanical stress, prevents the solder joints from cracking as the chip heats and cools, and keeps moisture and contaminants away from the circuitry.

Traditional underfill is dispensed as a liquid that flows under the chip by capillary action and is then cured. Mold underfill takes a different approach: the chip package is placed in a mold, and the underfill compound is injected so that it fills the gaps beneath the chip and forms the outer protective body of the package at the same time. Doing gap-filling and sealing in a single molding step saves process time and can deliver more uniform, reliable packages.

This matters enormously for AI chips. The processors used to train and run large AI models are large, power-hungry, and often combine multiple dies in one package, sometimes stacked with high-bandwidth memory. Bigger packages, higher operating temperatures, and denser interconnections all make the package more vulnerable to warping and cracking. Higher-power chips therefore need packaging materials with stronger heat resistance, greater mechanical strength, and better long-term reliability, exactly the properties Sumitomo Bakelite says its new capacity will serve. Even adjacent chip markets, from data-centre hardware covered in our piece on the data-centre boom to specialised silicon for markets like cryptocurrency hardware, which we explained in our look at the bitcoin rally, depend on ever more demanding packaging.

Communications satellites are another driver. Chips in orbit must survive years of radiation, extreme temperature swings, and launch vibration with no possibility of repair. Encapsulation materials that can withstand those conditions for a decade or more are a specialised and fast-growing segment.

Why it matters

The announcement is significant for three reasons. First, it confirms that the AI infrastructure boom is pulling investment deep into the supply chain, far beyond the chip designers and foundries that make headlines. The companies that make the resins, the photoresists, and the substrate materials are now expanding in step, which suggests the industry expects the demand wave to run for years.

Second, the geography matters. By adding capacity in Suzhou and Singapore, Sumitomo Bakelite is producing closer to its customers in China and Southeast Asia. The company has said that localising production improves supply flexibility while reducing exposure to transportation costs and other external supply-chain risks. That logic, diversifying production across regions to hedge against disruption, is now standard practice across the chip materials industry.

Third, the capacity multiples are large. Doubling underfill output and tripling molding-granule output is not a marginal tweak; it is a strategic repositioning. It suggests the company expects demand for these specific advanced materials to grow much faster than the overall semiconductor market, driven by the shift toward larger, hotter, more complex packages in AI and satellite applications.

Key facts

  • Sumitomo Bakelite announced on 9 October 2026 that it will add production lines for mold underfill materials and compression-molding granules at its plants in Suzhou, China, and Singapore.
  • The new lines will produce SUMIKON EME mold underfill materials, which fill gaps and seal chip packages in a single molding step.
  • Suzhou's expansion builds on a plant completed in 2024, with production starting in fiscal 2030; Singapore's lines go into the existing plant, with output from the end of fiscal 2028.
  • The company estimates its underfill capacity will roughly double and its compression-molding granule capacity will roughly triple.
  • The expansion targets demand from generative AI chips and communications satellites in China and Southeast Asia.
  • The company also plans to complete its acquisition of Kyocera's chemical business, agreed in January 2026 for about 30 billion yen, at the end of October 2026.
  • In June 2026 the company had already announced a first round of new lines at Suzhou, making this the second expansion of its Chinese operations in under four months.

What happens next

The immediate milestone is the closing of the Kyocera deal. Sumitomo Bakelite said it plans to complete the purchase of Kyocera's chemical business at the end of October 2026. The two companies agreed the deal in January 2026 for about 30 billion yen, roughly 190 million dollars, and it will add Kyocera's capacity in the same two product lines, mold underfill and compression-molding granules. Combined with the new lines, the company says the steps will strengthen its encapsulation supply across Japan, China, and Southeast Asia.

The longer timeline is the construction itself. Chemical plants for semiconductor-grade materials cannot be built overnight: cleanrooms, precision mixing and granulation equipment, and customer qualification cycles all take time. That is why the Singapore lines target the end of fiscal 2028 and Suzhou fiscal 2030. Investors and customers will be watching for progress updates, and for whether other Japanese materials suppliers follow with their own announcements.

For the wider industry, the expansion is another data point in a clear trend: the AI era is as much a materials story as a software story. The chips that power generative AI can only be built if the resins that protect them keep pace, and Sumitomo Bakelite is betting heavily that they will have to.