เอกสารอ้างอิง American Society for testing and Materials, ASTM C 18895 : Standard Test Method for Density of Hydraulic Cement, Annual Book of ASTM Standard, 2001, Vol.04.01,Philadelphia,179180. สำนักงานมาตรฐานผลิตภัณฑ์อุตสาหกรรม, มอก. 152521 : มาตรฐาน
Over the years, HcN Industry has been operating in accordance with the law, paying taxes in good faith, striving to contribute to the economic development of the region, focusing on employee development, investing in employee training, and safeguarding the interests of employees. At the same time, HcN Industry actively supports public welfare undertakings such as education, charity and environmental protection.