Differentiation of physical and mechanical properties analysis of self made gypsum product with raw material from Tasikmalaya with standar ISO and factory made

Abstract

In early research, gypsum's product from Padalarang and Tasikmalaya had been compared and it is found that Tasikmalaya gypsum was better. In these research, it's used gypsum product from Tasikmalaya with wet calcination method using autoclave. This research consisted of four samples divided into three control groups and one treatment group. Research's sample consisted of 45 units and 15 units data from the last research. To compared physical and mechanical properties, every samples was tested in three treatments. Research results showed that the average setting time, setting expansion and compressive strength of wet calcination gypsum product are respectively 487.6 seconds, 0.492%, and 12.708 Mpa. The results were statistically analyzed with MANOVA and Tukey test. The analysis showed differences in physical and mechanical properties between self made gypsum product from Tasikmalaya with Padalarang's and two marketed gypsum products. Setting time self made gypsum product meets the ISO for type III, while compressive strength and setting expansion were not. But gypsum's production from Tasikmalaya done by wet calcinations had better physical and mechanical properties, so it can be used in dentistry.

Setting time of construction gypsum, dental plaster, and white orthodontic gypsum

“…Other research on local gypsum products showed that the average setting time of the self-made gypsums was around 8 minutes and 7 seconds and 3 minutes and 40 seconds. 14 The study above also reported an average setting time of 20 minutes and 21 seconds for dental plaster and 10 minutes and 34 seconds for dental stone. 14 …”

“… 14 The study above also reported an average setting time of 20 minutes and 21 seconds for dental plaster and 10 minutes and 34 seconds for dental stone. 14 …”

“…The attempt to produce local gypsum products, with wet calcination method using autoclave, had been compared. 14 The research raises the thought of using construction gypsum, abundant in Indonesia, as an alternative material for dental plaster and white orthodontics gypsum. Construction gypsum has the same basic material and molecular shape as dental plaster and white orthodontics plaster.…”