生(sheng)產石(shi)(shi)(shi)(shi)膏的(de)(de)原料主要為含硫酸鈣的(de)(de)天(tian)(tian)然石(shi)(shi)(shi)(shi)膏（又(you)稱(cheng)生(sheng)石(shi)(shi)(shi)(shi)膏）或含硫酸鈣的(de)(de)化工副產品和磷石(shi)(shi)(shi)(shi)膏、氟(fu)石(shi)(shi)(shi)(shi)膏、硼(peng)石(shi)(shi)(shi)(shi)膏等廢渣，其化學(xue)式為CaSO4.1/2H2O，也稱(cheng)半水石(shi)(shi)(shi)(shi)膏。將(jiang)天(tian)(tian)然二水石(shi)(shi)(shi)(shi)膏在(zai)不同的(de)(de)溫度下(xia)煅燒可(ke)得(de)到(dao)不同的(de)(de)石(shi)(shi)(shi)(shi)膏品種。如將(jiang)天(tian)(tian)然二水石(shi)(shi)(shi)(shi)膏在(zai)107~170℃的(de)(de)干燥(zao)條件下(xia)加熱可(ke)得(de)建筑(zhu)石(shi)(shi)(shi)(shi)膏。

將建(jian)筑石膏加水(shui)(shui)(shui)(shui)后，它首(shou)先(xian)溶解于水(shui)(shui)(shui)(shui)，然后生(sheng)(sheng)(sheng)成二(er)水(shui)(shui)(shui)(shui)石膏析(xi)出。隨著(zhu)水(shui)(shui)(shui)(shui)化(hua)的(de)不(bu)(bu)斷進行，生(sheng)(sheng)(sheng)成的(de)二(er)水(shui)(shui)(shui)(shui)石膏膠(jiao)體(ti)(ti)微(wei)(wei)粒不(bu)(bu)斷增(zeng)多，這(zhe)些微(wei)(wei)粒比原先(xian)更(geng)加細小，比表面積很(hen)大，吸附著(zhu)很(hen)多的(de)水(shui)(shui)(shui)(shui)分；同(tong)時(shi)漿(jiang)體(ti)(ti)中的(de)自(zi)由水(shui)(shui)(shui)(shui)分由于水(shui)(shui)(shui)(shui)化(hua)和(he)蒸(zheng)發而(er)不(bu)(bu)斷減少(shao)，漿(jiang)體(ti)(ti)的(de)稠度不(bu)(bu)斷增(zeng)加，膠(jiao)體(ti)(ti)微(wei)(wei)粒間的(de)黏(nian)結逐步增(zeng)強(qiang)，顆粒間產生(sheng)(sheng)(sheng)摩(mo)擦(ca)力(li)和(he)黏(nian)結力(li)，使漿(jiang)體(ti)(ti)逐漸失去(qu)可塑性(xing)，即漿(jiang)體(ti)(ti)逐漸產生(sheng)(sheng)(sheng)凝結。繼(ji)續水(shui)(shui)(shui)(shui)化(hua)，膠(jiao)體(ti)(ti)轉變(bian)成晶(jing)體(ti)(ti)。晶(jing)體(ti)(ti)顆粒逐漸長(chang)大，使漿(jiang)體(ti)(ti)完全失去(qu)可塑性(xing)，產生(sheng)(sheng)(sheng)強(qiang)度，即漿(jiang)體(ti)(ti)產生(sheng)(sheng)(sheng)了硬(ying)化(hua)。這(zhe)一過(guo)程不(bu)(bu)斷進行，直至漿(jiang)體(ti)(ti)完全干燥，強(qiang)度不(bu)(bu)在增(zeng)加，此時(shi)漿(jiang)體(ti)(ti)已硬(ying)化(hua)成人造石材。

海南免膠石膏是以(yi)建筑石(shi)膏為主要原材料，經加(jia)水攪拌、澆注成(cheng)型和干燥制(zhi)成(cheng)的(de)輕(qing)質建筑石(shi)膏制(zhi)品。生產中允許加(jia)入纖(xian)維增強材料或輕(qing)集料，也可加(jia)入發泡劑。石(shi)膏砌塊具(ju)有隔聲防(fang)火、施工便捷等多項優點，是一種低碳環保、健康、符合(he)時代發展(zhan)要求(qiu)的(de)新(xin)型墻體材料。