1910's

1919	January	Hayashi Shell Powder Manufacturing was founded in Shijyonawate City, Osaka Prefecture January 1919. Started production and sales of white pigment 'Bleached Shell Powder', based on raw materials such as oyster and ark shell. Transitioned to water based pigments for use with dolls, furniture and paints.

1950's

1951	February	Moved Sales Division Tenjinbashi, Kita-Ku in Osaka. Began sales of white pigments such as Red Lead, White Lead, ZnO, Barium and Calcium Carbonate.
1958	February	Organization was changed to Hayashi Shell Powder Manufactory (Capital stock 3million JPY). Tokyo Sales Office opened. Began focus on sales of diatomaceous earth for fluid filtration, petrochemicals, textiles, pharmaceuticals and consumable goods (food) fields.
	September	With the diversification of our commodity range, the organizationwas renamed Hayashi Kasei Co., Ltd.

1960's

1961	March	Establishment of Nihon Catalizer Industry Co., Ltd. for the purpose of catalyst carriers. Renamed in the same year to Hayashi Sangyo Co., Ltd. with the chalk manufacturing business transferred to this entity. Began sale of SPS Kaolin for paper coating from UK based English China Clay Inc. Became Japan trade agent of US based Grefco Inc diatomaceous earth. Also became import agent for Engelhard Minerals (now, BASF)'s kaolin and attapulgites for paints, inks, coating materials, and synthetic resin. Capital increased by 6million JPY.

1970's

1972	March	Capital increased by 30million JPY.
1975	March	Hayashi Sangyo Co., Ltd. started production of imported talc. Began nationwide sales of polypropylene resin talc filler in two domestic plants while obtaining GMP license of pharmaceutical talc.

1980's

1982		Began sales of Brazil based Cadam Co., Ltd. Amazon kaolin A-88 for paper coating. Capital increased by 50million JPY.
1986	January	Tokyo Sales office status changed to official branch.

1990's

1997		Established an Ultra-fine Talc plant in Yingkou New Port in Liaoning Province, China using Haicheng talc supplying Japanese companies involved in international trade within the plastics sector.

2000's

2001	March	Relocation of state-owned plant in Haicheng district (producer of talc raw materials) to Talc producing sea-side renaming China Haicheng Plant increasing scale of production of Ultra-Fine talc and establishing a greater variety of commodities within a new supply system.
2003	March	Transfer of Tokyo Branch Office to Minato-ku, Shiba Park.
2004	November	Began sales contract and supply of DNA, RNA phosphoramidite, exclusively for Japan with South Korea based Samchylly pharma Co., Ltd.
2005	February	Established local corporation HK KOREA in Seoul, South Korea.
2007	June	Acquired ISO 9001: 2000 / JISQ9001: 2000 certification (registration number: JCQA-1651)
2009	January	Established "Hayashi Kasei (Thailand)" local corporation in Bangkok, Thailand.

2010's

2010		Closed Shijonawate Plant and transferred the construction and production base to new Hashimoto Plant to expand production capacity.
	February	Established a nucleic acid pharmaceutical research and development company "Bonac Corporation"
	August	Construction of Hashimoto Plant in, Hashimoto City Wakayama Prefecture.
2013	February	Capital Participation in South Korea KOCH, Inc.
	September	Transfer of Tokyo Branch Office to Toranomon Minato-ku.
2015	June	Transfer to Head Quarter to Dojimahama Shin-daibiru Building Kita-ku Osaka.
	November	Fukuoka Branch opened in Chuou-ku, Fukuoka Prefecture.
2016	May	Tokyo Branch Office moved to Kanda, Chiyoda-Ku Tokyo.
2018	September	Toyama Nano Plate Filler Laboratory opened in Takaoka city, Toyama Prefecture.

2020's

2020	October	Transfer to Head Quarter to KC-DoDo Building Kita-ku Osaka.
2024	April	Transfer to Fukuoka Branch to SK Bldg Hakata-ku,Fukuoka.