| Aplii-72 | Yamato Chemical establishment |  |
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| July-73 | The structure change in Yamato Chemical |
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| Aplii-75 | Head office factory relocation 1405-3Kamiechi Atsugi-si Kanagawa Japan |
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| June-75 | The capital is increased to the capital 2,000,000 yen. |
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| Oct-75 | The capital is increased to the capital 3,000,000 yen. |
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| Oct-89 | Organization change from limited company to corporation |
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| Nov-89 | The capital is increased to the capital10,000,000 yen. |
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| Oct-91 | Pass Japanese Industry Standard (JIS) |
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| Dec-93 | Designated as a good company from Kanagawa Prefecture |
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| Oct-99 | Thailand plant: YAMATO CHEMICALS (THAILAND) CO., LTD founded |
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| Aug-02 | YCJ ISO9001: 2000 certification acquired |
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| Jan-03 | YCT ISO9001: 2000 certification acquired |
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| May-03 | Kanagawa middle enterprise model factory designation |
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| Apl-04 | YCT capital 20 million baht |
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| Mar-05 | Thai Second Plant: Yamato POLYMER CO., LTD (YPC) established |
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| Aug-06 | YPC ISO 9001: 2000 certification acquired |
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| Aug-08 | YPC ISO14001: 2004 certification acquired |
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| Sep-08 | JIS B 2401-1 O-Ring JIS mark display system certification acquired |
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| Jan-09 | YCT ISO 9001: 2008 certification acquired |
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| Aug-09 | YPC ISO 9001: 2008 certification acquired |
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| Dec-09 | UL 94 - V - 0 Certification Acquired |
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| May-10 | YCT capital 32 million baht |
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| Aug-10 | Acquired ISO 9001: 2008 certification |
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| Dec-10 | Launched sales of its own brand "Laminate Protector" |
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| Oct-11 | Laminate protector New technology information supply system "NETIS" registration |
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| Aug-12 | Head office factory · 2nd factory refurbishment dining room building newly established |
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| June-13 | YPC capital increase after capital 12 million baht |
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| July-13 | President and Representative Director Hidehiro Nakamura assumed office |
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| Aug-13 | YPC "IPO: International procurement office" certification acquired |
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| Oct-13 | Vietnam Factory: Established YAMATO RUBBER VIETNAM CO., LTD (YRV) |
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| Oct-13 | YRV "EPE: Export Processing Enterprise License" Acquired |
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| May-14 | Eco Stage 1 Certification of Environmental Management System |
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| Jul-15 | Expansion of main factory factory medical inspection building |
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| Feb-17 | YRV ISO 9001: 2015 certification acquired |
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| Feb-17 | YRV ISO 14001: 2015 certification acquired |
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| July-17 | Eco Stage 2 Certification of Environmental Management System |
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| Aug-17 | YCJ ISO 9001: 2015 certification acquired |
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| Aug-17 | YPC ISO 9001: 2015 certification acquired |
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| Aug-17 | YPC ISO 14001: 2015 certification acquired |
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| Jan-18 | YCT ISO9001：2015 certification acquired |
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| Feb-19 | YCT ISO14001：2015 certification acquired |
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| Apr-19 | YCJ refurbished its second plant into a clean room |
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