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Company Information

Company policy

  1. 1. Contribute to society through business activities.
  2. 2. Endeavor to improve personal and corporate dignity.
  3. 3. Work to create a positive and energetic company.

Quality policy

  1. 1. We will provide satisfying products to achieve prosperity together with customers.
  2. 2. We will set quality targets and work to meet them. We will also review these targets and improve them as needed.
  3. 3. We will continuously improve product design and manufacturing processes in compliance with laws and ordinances and in consideration of quality, environment and safety.

Company overview

Company name Denka Elastlution Co., Ltd.
Established August 8, 1963
Representative Hideaki Nagasaka, President and Executive Officer
Location (Head Office and Factory) 306 Koyagi-machi, Takasaki-shi, Gunma Prefecture 370-0071 Japan →Google Map
Site area
23,800 m²
Building area 5,600 m²
Phone +81-27-362-7510
Facsimile +81-27-362-7561
Capital 30 million yen
Annual sales 1,000 million yen
Business Manufacturing, processing and sales of industrial rubber products
Organization Manufacturing Dep., Technical Development Dep.,
Sales Dep. and General Affairs Dep.
Main banks The Gunma Bank, Ltd. Takasaki Branch and Mizuho Bank, Ltd. Takasaki Branch


1963: Denki Kagaku Kogyo Kabushiki Kaisha (currently, Denka Co., Ltd.) co-founds the company with local capital in the city of Takasaki under the name of Chloroprene Kogyo, with capital of 10 million yen.
1964: The first plant for kneading black compounds is completed and begins the manufacture and sale of compounds.
1967: The second plant for press molded products is completed.
1968: The third plant for extrusion formed products is completed. The company increases its capital to 15 million yen.
1969: The fourth plant for kneading white compounds and colored products is completed.
1989: The company changes its name to CRK Co., Ltd. and increases its capital to 30 million yen.
1991: The company expands its first and fourth plants.
1994: The sixth plant for refining and specialty products is completed.
1996: The seventh plant for flexible joints and special fillers is completed.
2003: The eighth plant for fire resistant rubber products is completed.
2006: The new office is completed.
2007: The company wins a Gunma Technology Award from the Gunma Prefectural Government for its thermal expansion rubber products.
2009: The company obtains ISO 9001 certification.
2013: The company introduces automatic measuring equipment to the kneading process. The company celebrates the 50th anniversary of its foundation.
2018: The company becomes a wholly owned subsidiary of Denka Co., Ltd.
2019: The company changes its name to Denka Elastlution Co., Ltd.

Group Companies

Denka Co., Ltd. A general chemical company
Toyo Styrene Co., Ltd. Manufacturing and sales of plastics (polystyrene)
Kanto Acetylene Industry Co., Ltd. Manufacturing and sales of dissolved acetylene gas and cylinders.
Denka Renotec Co., Ltd. Survey and inspection of concrete structures, work specializing in repair and reinforcing technologies and sales of special materials used in this work.
Denka Polymer Co., Ltd. Manufacturing and sales of plastic lightweight food containers
Denka Engineering Co., Ltd. Comprehensive engineering for different kinds of plants
YK Akros Trading Co., Ltd. A general trading company (formerly Akros Trading Co., Ltd. and YK Inoas Co., Ltd.)