EipponCell® HEMC LH 6200M hydroxyethyl methyl cellulose plays a multifaceted role within cement mortar, encompassing functions such as water retention, thickening, air entrainment, retardation, and the enhancement of tensile bond strength. These functions align with critical considerations when assessing and choosing HEMC for specific applications, including aspects like HEMC viscosity, water retention capability, and open time. Selecting the right HEMC for various mortar products necessitates a keen understanding of the performance criteria specific to each product's construction and usage requirements. This involves articulating the performance expectations for HEMC while taking into account the composition and fundamental parameters of HEMC. Foremost among the factors influencing the effectiveness of hydroxyethyl methylcellulose in applications are its viscosity, water retention capacity, and open time. These variables hold the key to optimizing HEMC's performance in diverse mortar scenarios.