… or not coloured, with or without small quantities of accelerators or retarders. …
Explanatory notes
… or not coloured, with or without small quantities of accelerators or retarders. 2520.10 ‑ Gypsum; anhydrite … sulphate used in the manufacture of sulphuric acid or of certain types of plaster. Plasters consist of gypsum partly … quantity of an accelerator such as alum is added (Keene’s cement or English cement). Similar plasters are made by …