ENVALITH
積水化成品工業株式会社 logo

Sekisui Plastics Co.,Ltd.

4228・Prime Market・Chemicals

Official website
積水化成品工業株式会社 logo
Sekisui Plastics Co.,Ltd. 4228

Business

Sekisui Plastics Co., Ltd. is a foam plastics specialist founded in 1959, with an integrated business structure spanning resin and sheet manufacturing through to the production and sale of finished products. The group comprises 37 companies in total, including 16 domestic consolidated subsidiaries and 14 overseas consolidated subsidiaries, operating production and sales bases both in Japan and overseas. The business consists of two segments: the Human Life Segment (agricultural and marine materials, food packaging materials, and civil engineering and building materials) and the Industry Segment (automotive components, electronic component materials, and medical and health-related materials). Major customers include Fpco, a leading food container manufacturer (sales of ¥18,439 million in FY2026 (ending March 2026), representing 16.2% of sales), and the company supplies high-performance foam materials globally in the automotive, electronics, and medical fields. Listed on the Prime Market of the Tokyo Stock Exchange.

Business Model

Based on core technologies such as extrusion foaming, suspension polymerization, and molding, the company offers a wide product lineup ranging from general-purpose to high-performance products. Domestically, it secures stable earnings mainly from mass-produced items such as food containers and civil engineering materials, while overseas it supplies high-value-added products such as automotive components and electronic materials through local subsidiaries in Asia, Europe, North America, and Central America. The company maintains an integrated system from raw material procurement to manufacturing and sales, managing profitability by combining appropriate pricing with cost reduction activities. R&D expenses amounted to ¥2,363 million in FY2026 (ending March 2026), and the company is advancing the development of environmentally contributive products and next-generation electronic materials.

Company Strengths

The company has an integrated business structure spanning from resin and sheet manufacturing to the sale of finished molded products, and operates production and sales sites across Asia, Europe, North America, and Central America through 37 domestic and overseas group companies. This vertically integrated structure serves as the foundation for quality control and cost competitiveness.

The company has a joint development relationship with major food container maker Efpico, and net sales to this customer in FY2026 (ending March 2026) reached ¥18,439 million (16.2% of net sales). In civil engineering materials, rainwater storage systems, lightweight banking materials, and FJ Ring have steadily secured projects, providing a stable segment profit of ¥3,034 million in the Human Life Segment.

Techpolymer, a high-performance polymer microparticle produced using proprietary polymerization technology, has led to the newly developed flexible grade for low-dielectric materials, and the company is expanding its applications into high-speed communications, flexible substrates, and automotive electronic materials. Technogel has seen the development of a new grade suitable for long-duration adhesion, expanding its application in the biosensing market. R&D expenses in the Industry Segment totaled ¥1,937 million (FY2026, ending March 2026).

ENVALITH's Perspective

Operating profit for FY2026 (ending March 2025) improved significantly to ¥2,552 million (up 298.0% year on year), and profit attributable to owners of parent also turned positive at ¥2,147 million. The effect of structural reform through the exclusion of the Proseat group is clearly reflected in the figures. On the other hand, net sales declined 16.9% year on year to ¥113,935 million, reflecting both the disappearance of the European business and sluggish demand in the food container and electronics areas. The medium-term plan's FY2027 (ending March 2027) net sales target of ¥100,000 million presupposes further contraction, making the trade-off between improved profitability and reduced scale a key focus for investment decisions.

Segment profit in the Industry Segment improved significantly to ¥2,534 million, but the main driver was the structural factor of Proseat's exclusion, requiring careful assessment of the underlying strength of existing businesses. As external factors, demand for North American automotive applications continued to fluctuate due to tariff policy and EV shift trends, while demand for LCD panel transport container materials weakened in Northeast Asia, resulting in sluggish performance. Whether next-generation materials such as low-dielectric polymer microparticles and hollow nanoparticles can accumulate adoption track records will be key to medium- to long-term margin improvement.

Against the quantitative targets of the medium-term management plan "Going Beyond 2027," the FY2026 (ending March 2025) results (operating margin of 2.2%, ROE of 4.3%) are broadly consistent as a waypoint toward the FY2026 plan targets (operating margin of 3.0%, ROE of 5.0%). The forecast for FY2027 (ending March 2027) shows net sales of ¥105,000 million and operating profit of ¥3,100 million (operating margin of 2.95%), indicating progress in line with the plan. However, achieving the final FY2027 targets of a 4.5% operating margin and 6.0% ROE will require continued pass-through of sales prices and reduction of fixed costs amid an uncertain external environment for raw material and energy costs, and ongoing verification of the likelihood of achievement is warranted.

Growth Strategy

Under "Going Beyond 2027," the company is pursuing enhanced profitability and transformation of its business portfolio, targeting an operating margin of 4.5% and ROE of 6.0% in FY2027.

Completed the transfer of the six European Proseat group companies in FY2026 (ending March 2026), removing them from the scope of consolidation. The fixed assets (land and buildings) of the Taiwanese subsidiary were also transferred in April 2026 (expected gain on transfer of approximately ¥1.0 billion). The company will continue disposing of and selling unnecessary assets and consolidating sites to improve capital efficiency.

Focus is being placed on expanding the adoption of new components in North America, Mexico, and China using ST-Eleveat and Piocelan RNW / Piocelan 2.0. In FY2026 (ending March 2026), both Japan and North America performed well, with price revision effects also contributing. The company will continue to expand orders at its U.S. subsidiary while developing its regional strategy with close attention to tariff policy and EV adoption trends.

Newly developed nano-sized polymer microparticles were advanced into the next-generation electronic materials field as products addressing optical characteristics for optical display films and optical communication components. The company will continue efforts to expand the adoption of low-dielectric polymer microparticles in semiconductors and electronic devices, and to establish a track record for hollow nanoparticles used in internal components of next-generation displays.

The company is promoting expanded adoption of Eslen Beads RNW and Piocelan RNW, which use recycled raw materials, among consumer co-ops and mass retailers. It obtained a B score in both the "Climate Change" and "Water Security" categories in the CDP assessment for the second consecutive year. Efforts will continue toward achieving quantitative targets for GHG emissions reduction, recycling, and the ratio of biomass raw material use.

Last updated: July 19, 2026