In this March 2019, The Department of Industrial Works (DIW), Thailand issued a drafted list of new hazardous substances to receive comments from stakeholders. Due date for receiving comments did not appear on the web site.

You can download the new list in pdf form and input comments from the web site at;

http://php.diw.go.th/rubfung/show.php

Someone claimed that impurity of 0.005 w/w % in Hexachlorobenzene was challenging for some materials.