Showa Denko Kenzai K.K.


Company Name Showa Denko Kenzai K.K.
Head office 8, Ebisu-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture 221-8517, Japan
TEL: 81-45-444-1690
FAX: 81-45-444-1698
Mail(Administration Dept.)
*Please contact us by e-mail as far as possible.
Established December 1977
President Takayuki Tohaya
Closing date December
Capital 250 million yen (as of Jan. 4, 2021)
Number of shares issued 140 thousand (as of Jan. 4, 2021)
Stockholder Showa Denko K.K.100%
Employees 65 (as of Jan. 4, 2021)
Management Team
Representative Director
and President
Takayuki Tohaya
Absentee Director Noriyuki Matsushima
Absentee Director Ken Kimura
Absentee Auditor Kenji Hirai
(as of Jan. 4, 2021)
Main products

Construction Material Sales Department
Premixed mortar, Emulsion, Waterproofing materials, Anticorrosive materials for concrete

Piping Materials & Equipment Sales Department
Fire resistive Dual Pipes, Rooftop multipurpose unites, Silent Drain Pipe Joint and Drain System, Noise Insulating Fire Resistive Pipes

Domestic sales office

Sendai Branch
Visual Tower Miyagino 3F, 3-7-14, Haranomachi, Miyagino-ku, Sendai-shi, Miyagi Prefecture 983-0841, Japan
TEL : 81-22-242-5077

Nagoya Branch
Shirakawa honmachi Bldg.4F, 3-11-23, sakae, naka-ku, Nagoya-shi, Aichi Prefecture 460-0008, Japan
TEL : 81-52-249-3151

Osaka Branch
Samty Fame Shin-Osaka, 6-5-3, Nishi Nakajima, Yodogawa-ku, Osaka-shi, Osaka Prefecture 532-0011, Japan
TEL : 81-6-6100-2202

Fukuoka Branch
7th Myojo Bldg. 2F, 4-1-1, Tenjin, Chuo-ku, Fukuoka-shi,  Fukuoka Prefecture 810-0001, Japan
TEL : 81-92-737-5061

Domestic production sites Ishioka Plant
6-2, Kashiwabara, Ishioka-shi, Ibaraki Prefecture 315-0002, Japan
TEL : 81-299-56-7601


1971 Imported highly fluidized chemical admixture (Mol Master) and began to sell it.
1973 Developed the first premixed mortar (High-Mol) in the world and began to manufacture and sell it. Began to manufacture and sell mortar adhesion enhancer (High-Mol Emulsion).
1977 Established Showa Denko Kenzai K.K. with 100% capital invested by Showa Denko K.K.
1981 Began to manufacture and sell fire resistive dual pipes (Keipla Pipes).
1985 Shifted the control of manufacturing Keipla Pipes to Kanose Denko K.K. (today's Niigata Showa K.K.).
2009 Relocated the head office from Hamamatsu-cho, Minato-ku, Tokyo to Ebisu-cho, Kanagawa-ku, Yokohama, Kanagawa
2012 Began to manufacture and sell "SHOWA (((Shaon))) FDP"
Sound insulation is called “Shaon” in Japanese.
2015 Completed a new mortar plant in Ishioka Plant.
Transferred “Lambda” business to Konoshima Chemical Co., Ltd.
2016 Completed a new plant for “HATOCOT” (Rooftop multipurpose piping unit) in Ishioka Plant.
2017 Started to take charge of production of piping materials from A&A Material Corporation.

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