Background: One of the most efficient bactericidal agent is a Chlorhexidine (CHX). Gypsum products are multifunctional materials in the dental field. The combination of different dental materials has become an urgent necessity to reveal more new properties. Aim: Evaluate the effect of incorporation of 0.2% CHX solution on the detail reproduction compatibility with impression materials, and fluidity of Iraqi stone comparing with Hi-stone. Materials and Methods: W/P ratio 33ml/100g for Hi-stone and 38ml/100g for Iraqi stone. For detail reproduction detail test block which had 60-degree angle grooves width (0.025, 0.050, 0.075, 0.1, 0.2, 0.3) mm with cross line. Silicone, alginate, and zinc oxide eugenol (ZOE) used for compatibility with impression materials test (n= 10), after setting of impression material, poured with stone and scored. Fluidity was obtained with a different w/p ratio by a slump plate diameter. Results: The mean reproduction of detail was 1.03 ± 0.4 Iraqi stone and 1.03±0.4 Hi-stones. The mean scoring with silicone of Hi-stone was 1.03±0.4 while Iraqi stone was 1.03±0.4. The mean diameter of the slump test was 99.0±1 with Hi-stone, a higher mean of 99.6±1.34 of new Iraqi stone. Conclusion: 0.2% CHX improved the reproduction of detail ability of both types of stone, the same compatibility with silicone and alginate impression materials but less compatibility with ZOE for the two types of stone. Both stones demonstrated reasonable and similar fluidity.