After our station chemist contact Khun Naphol at Chemical division EGAT Central and vendor of chemical. we can confirm that the chemical are Silicone antifoam we use them to spray foam at CT basin but we did not use them for long time. Today we will remove them from container to chemical lab. to check them can use and effective to eliminate foam or not follow vendor recommendation. As the physical all of chemical drums (antifoam) have been never used and absolutely close and seal no contact air then after check. We will have conclusion to keep them to use when we require with provide MSDS or dispatch them to chemical egat central or other plants of egat.