Sodium polyacrylate is a sodium salt of polyacrylic acid with the chemical formula [−CH2−CH(CO2Na)−]n and has broad industrial applications, such as waste liquid control/drilling fluid/concrete protection/ wire and cable water blocking/hot/cold gel pack products.

This super absorbent polymer (SAP) has the ability to absorb 100 to 1000 times its mass in water. It contains sodium which gives it the ability to absorb large amounts of water. When dissolved in water, it forms a thick and transparent solution due to the ionic interactions of the molecules. Sodium polyacrylate has many favorable mechanical properties. Some of these advantages include good mechanical stability, high heat resistance, and strong hydration.