History of plaster in the country
The old gypsum has a close relationship with the construction industry and is one of the traditional building materials of Iran. Gypsum is seen in most of the ancient buildings that have remained so far as the works of beautiful gypsum plaster. Since the time of the Parthians, there are gypsum decorations that represent the creativity and art of Iranian professors. Since the Islamic era, there have been numerous gypsum plots in Islamic architecture, which is an advanced diagram of this art in the land of Iran. The magnificent Qapu, the palace of eight paradises and the beautiful gypsum of the mosque of Urmia are among the most striking effects of this art. The floor around the hall and the stairs and palace columns of Lalehzar Tehran on Saadi Street was made with marble gypsum stone. Until the year 1340 in Iran, gypsum was the only elemental and low technology produced in the traditional way, but the lack of mass production and the poor quality of the products and the high price of the finished product provided the necessary incentives for the establishment of machine plaster plants in Iran.