Since its founding, CST has grown by delivering products that contribute to industrial development.
Today, there are increasing calls for companies to clarify their stance on social responsibility, and give back to society.
CST is determined to fulfill its social responsibility as a member of the local community and international society by outlining and putting into practice the following code on corporate ethics and conduct.


  • The Company shall comply with the laws, regulations, and social norms of Japan, and shall refrain from violating such under all circumstances.

2Preservation of the Global Environment and Product Safety

  • The Company shall pursue the development of an environment management system based on its environment policy and environmental targets.
  • The Company shall assure the safety and quality of its products.

3Respect for Human Rights, Labor, and Health and Safety

  • The Company shall respect the human rights of each individual, and refrain from any act that infringes upon said human rights, including engaging in unfair discrimination on the basis of one's race, the color of their skin, religion, creed, gender, social position, or disability, or sexual harassment and other forms of harassment.
    In addition, the Company shall not encourage or tolerate such behavior.
  • The Company shall develop a comfortable workplace environment that ensures employee health and safety.
  • The Company shall not engage in child labor or forced labor.

4Promotion of Information Security and Personal Information Protection

  • The Company maintains and promotes information security to protect information belonging to the Company and third parties in an appropriate manner.
  • Information held and distributed by the Company shall be used and managed as appropriate according to the type of information in use, including, but not limited to, confidential information pertaining to the Company, confidential information pertaining to third parties, or personal information.

5Whistleblower Protections

  • The Company shall handle any internal reports received in an appropriate manner, and shall refrain from acting in a way that disadvantages the whistleblower.

6Fair Trade

  • Fair trade
    The Company shall respect fair, transparent, free competition, and shall not take part in unfair trading practices.
  • Intellectual property protection
    The Company understands that intellectual property is an important management asset that serves as a foundation for our business activities, and we strive to acquire, secure, and utilize said rights based on a full understanding of their legal significance, protecting the Company's own intellectual property rights while respecting the intellectual property rights of other parties.
  • Prohibition of bribery, etc.
    The Company shall refrain from bribing public officials and others, nor shall it leverage its position in a working relationship to engage in bribery, extortion, or embezzlement.

7Social Contribution

  • The Company shall contribute to the further development of the FPD industry by continuing to take on the challenge of developing new technologies that meet the customer’s needs while delivering high quality mask blanks.
  • The Company shall contribute to society by providing donations and labor to local and international bodies.

April 1, 2023
CST Co., Ltd.