Nitto Boseki Co., Ltd. · Year ended March 2026

The glass cloth Nittobo supplies for AI circuit boards

Nittobo makes materials and products including glass fiber for electronic boards, insulation for homes and diagnostic reagents. Its electronic-materials business supplies glass yarn and woven glass cloth to customers such as copper-clad laminate manufacturers.

2 primary sourcesPublished 2026-10-25Updated 2026-10-25

Fine glass yarn opens into woven cloth and connects with layered resin-and-copper boards, a semiconductor package and a server board.

From glass yarn to the inside of a board

Nittobo’s materials pass through laminate and circuit-board manufacturing before becoming part of electronic equipment.

Nittobo
Supply yarn and cloth
Fine glass yarn is woven and treated to make cloth. Nittobo also sells the yarn itself.
Laminate and board makers
Combine cloth, resin and copper
- Copper foil
- Glass cloth
- Resin
Cloth is combined with resin. Inside the copper-containing board, it provides insulation and reinforcement.
Manufacturers using the boards
Boards beneath the chip
Chip → Package substrate → Motherboard
Glass cloth is used in the package substrate beneath a chip and in the motherboard below it.

Simplified structure and layer count. Glass types are selected for their applications.

Source: Integrated Report 2026, PDF p.25 (printed p.24; Japanese)

Different glasses for signal loss and board warpage

Deciding which production steps will meet growing demand

DATA VIEW

Electronic-materials sales to external customers

Actual results for the years ended March 2025 and March 2026, in ¥ million. Excludes intersegment sales; a common scale starts at zero. Source: financial results, PDF pp.16–17.

Year ended March 2025¥40,911m

Year ended March 2026¥49,265m

CONCEPT MAP

Dividing the work of supplying more glass cloth

Policy described in September 2026. This does not state that weaving for every product will move outside the group.

Nittobo's glass composition and process technologyCapacity investment and outside collaboration

Melt glass and spin yarnConcentrate on special compositions and extremely fine yarn
Collaborate in weavingOutsource weaving work to Nan Ya Plastics
Finish the clothStrengthen surface-treatment technology and capacity

Consolidated net income also includes an asset-sale gain

Consolidated operating profit ¥20.819bn

Operating profit and extraordinary gains, year ended March 2026

Group sales were ¥118,229 million and operating profit was ¥20,819 million. Besides electronic materials, the group includes medical, composite, industrial materials and chemicals, insulation and other businesses. Segment profit totals ¥22,979 million before a negative ¥2,160 million adjustment for corporate expenses, elimination of unrealized profit and other items, arriving at consolidated operating profit.

Profit attributable to owners of the parent was ¥41,770 million. Its calculation includes extraordinary gains such as ¥34,165 million from sales of fixed assets. The size of net income cannot be treated as profit earned simply by selling glass materials.

THE VIEW AFTER THE NUMBERS

What the numbers suggest

Nittobo supplies woven glass that insulates and reinforces electronic boards. Within that material family, NE/NER limits signal loss while T glass addresses thermal expansion and warpage.

Serving the growth in electronic materials takes more than designing a composition. It requires consistent high-volume production of fine yarn and thin cloth, and additional capacity at the necessary processing stages. Outside collaboration in weaving and investment in Nittobo’s own facilities are choices about how to provide that supply.

Primary sources used

FY March 2026 Consolidated Financial Results (Japanese)

Nitto Boseki Co., Ltd. · 2026-05-12

Pages used: p.1,10,17 / p.4,16-17

Open source →

Nittobo Group Integrated Report 2026 (Japanese)

Nitto Boseki Co., Ltd. · 2026-09-30

Pages used: p.19 / p.20,34 / p.25 / p.34-35