<![CDATA[The solar radiation heat absorbing plate is a major component in solar still applications. The fin absorber plate with mortar material as a heat absorber, heat transfer, and evaporation medium. In the fin absorber plate with mortar material, seawater flows inside the fin body capillarity and undergoes an evaporation process, leaving salt in the pores. Salt in the pores, type, and dimension of sand as the main forming material of mortar will also affect the effective heat conductivity value. This study evaluates salt formation in the pores with various types and dimensions of sand-forming mortar material on effective heat conductivity. The research was conducted experimentally by comparing the types and dimensions of sand-forming mortar. The types of sand used were iron sand (PB) and lichen sand (PL), with sand dimensions of 0.125 and 0.250, respectively. The types and dimensions of sand were formed into mortar with a mixture of 2 sand and one cement. The mortar test was compared with stone material. In the test, heating was applied to the top surface of the mortar and stone using a heating element (heater) with 46.4 W power for 120 minutes. The research resulted in the effective heat conductivity of all mortar materials increasing with increasing heating time and salt in the pores. The mortar material using iron sand with a dimension of 0.125 mm (PB.0.125) has a higher total effective heat conductivity of 0.712 (W/m0C) than PB.0.250, PL.0.125, PL.0.250 and stone.]]>
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