Metallic Syntactic Foams (MSF) are an advanced kind of foam that has attractive mechanical and thermal properties for those applications where density is a limiting parameter. The main sectors with potential application are Defense, Naval, Nuclear, Transportation and Aerospace.These materials exhibit the advantageous properties of conventional metallic foams (MFs) but unlike these, they are processed through manufacturing processes of composite materials (MMCs). Due to that, MSFs are also known as composite metallic foams (CMFs). They can be constituted of two or more phases: The continuous phase is known as matrix while the discontinuous or dispersed phase is known as reinforcement.The present work proposes a process for manufacturing MSFs based on liquid metallurgy routes. The MSFs are made of a matrix of aluminum alloy AA6063 (Al-Mg-Si) and two sets of porous reinforcements, made of clay and aluminum. This study characterizes samples of aluminum syntactic foams (ASFs) through the ISO-13314: 2011 standard. Subsequently, the behavior is modeled through a viscoelastic approach.