Established Sekisui Sangyo Co., Ltd. in order to run a general plastic business.

Changed the company name to Sekisui Chemical Co., Ltd. Started the plastic automatic injection molding business.

In 1950, developed Japan's first cellophane tape, which acquired a favorable reputation.
In 1952, started full scale production of "Eslon Pipe," a hard PVC pipe, which greatly contributed to infrastructural developments such as water supply/drainage, power supply and gas distribution systems.
In 1953, became listed on the Osaka Stock Exchange, and in 1954, on the Tokyo Stock Exchange.
In 1955, succeeded in molding injection of PVC pipe fittings.
In 1956, developed Japan's first plastic rain gutters ("Eslon Rain Gutters").
In 1959, opened an office in New York.

In 1962, established Sekisui Chemical Deutschland, an export, import and sales company for the European market.
In 1969, started production of plastic bathtubs.

In 1970, developed Japan's first modular house ("Heim M1"). Cumulatively sold more than 400,000 houses.
Developed polyethylene products. The company's plastic garbage bin products of "Poly-Pail" and "Poly-Bucket" greatly contributed to beautification of towns in Japan.
Sekisui's "Softlon," a radiation cross-linked foamed polyolefin product, became widely used in IT, automotive and building industries.
Exported the company's technology to the U.S. and Europe. Expanded production and sales networks through joint management with local companies. Actively promoted overseas operations.
In 1979, awareded the Deming Prize, the highest honor for quality management, including production, sales and service, for the company's active promotion of TQC activities.

In 1987, developed "Two-U Home," a wooden structured modular house made using the company's unit technology and 2x4 technology, and started its sales.

The company's consolidated net sales greatly increased during the 1980s, from 335.5 billion yen (1980) to 808.6 billion yen (1990).
In 1996, acquired ISO 9000 series quality system certification.
In 1996, the company's capital exceeded 100 billion yen. The year 1997 marked the 50th anniversary of the company's founding.
In 1996, started the company's first overseas factory for "S-LEC FILM," an interlayer film, in the Netherlands.
As part of the company's social action program, started providing support for the nature conservation project of Nippon Keidanren.
Introduced the environmental management system and acquired an ISO 14001 certification.

Started a 3-company system, an internal company system which consists of a housing company, an urban infrastructure and environmental products company and a high-performance plastics company.

Started local production and sales, in China, of many types of high-performance plastic products for infrastructural development, medical applications and automotive uses, such as water supply and drainage pipes, vacuum blood-collecting tubes and interlayer films.

Adopted a new catch phrase "Achieving the Cutting-edge - Sekisui Chemical, Full of Surprises."
Global promotion of the noise-insulating interlayer films operations starting from Europe with the completion of a newly built raw resin factory in Europe.

Started production and sales of vacuum blood-collecting tubes in China.

Started full-scale overseas operations for pipeline rehabilitation works. Established a joint venture in South Korea. Started accepting orders for rehabilitation works for sewage pipes in the United States.
Estalished joint ventures for the adhesive business with H.B. Fuller Company (USA)

Start of GS21 Go! Frontier, The Sekisui Chemical Group Midterm Management Vision 2006-2008.