Company Information

Activities

DJK’s main activities are below services related to polymeric materials and composite materials.

Synthesis, polymerization, and reforming action.
Compounding, molding, and processing samples.
Material testing, physical properties measurement, and analyzing.
Defect analysis of products.
Applying and testing various standard test (FDA/EPA, CSA, etc).

Company Overview

Company Name	DJK Corporation
Company Address	2-7-17 Shinyokohama, Kouhoku-ku, Yokohama, 222-0033 Japan
Date Founded	December, 1981
Capital	100 Million Yen
President	Toshinori Iwai
Number of Employees	109

Information of December, 2022

Company History

February 1964	Dainihon Jyushi Kenkyujyo (now Yokohama Laboratories) established
July 1971	Oversea section of Dainihon Jyushi Kenkyujyo has been separated and becomes DJK International Corporation (now Shin-Yokohama Office)
December 1981	DJK Research Center (now Chiba Technical Center) established
February 2001	Dainihon Jyushi Kenkyujyo changes company name to DJK Kenkyujyo
November 2003	DJK Kenkyujyo moves to Tsuzuki-ku, Yokohama
September 2004	DJK Research Center and DJK Kenkyujyo merged to form DJK Corporation
December 2005	DJK Corporation and DJK International merged
June 2009	New laboratory building completed in Chiba Technical Center
December 2013	Capital increase to 100 Million Yen
October 2014	Nagoya Laboratories established
October 2016	Polymer Processing Technology Laboratory established
February 2019	Headquarter relocated in Kouhoku-ku, Yokohama
November 2019	Shin-Yokohama Office relocated in Kouhoku-ku, Yokohama
July 2022	Central Laboratory established
December 2022	Polymer Fusion Technology Laboratory relocated in Moriyama-ku, Nagoya

Quality Control Activity

ISO9001 Quality Management System
Office	Yokohama Laboratories	Chiba Technical Center	Nagoya Laboratories
Registered Number	JQA-QMA12453
Examining Authority	Japan Quality Assurance Organization
Registered Date	October 2005	December 2012	October 2015

ISO17025 Quality Management System (for testing laboratories)
Office	Chiba Technical Center
Registered Number	RTL01110
Examining Authority	Japan Accreditation Board
Registered Date	June 2002
Testing Category	Mechanical properties of polymeric materials (tensile strength and combustion test)

ISO17025 Quality Management System (for testing laboratories)
Office	Yokohama Laboratories
Registered Number	RTL02820
Examining Authority	Japan Accreditation Board
Registered Date	March 2009
Testing Category	Chemical test / analysis of toxic substance
Analytical Method	Acid decomposition method in sealed container – Inductively coupled plasma mass spectroscopy
Analytical Method	Quartz tube combustion – Ion chromatography
Target material	Cadmium, lead, total chromium, mercury
Target material	Total boromine