20/01/2026
THE SCIENCE BEHIND SANITARY PADS AND DIAPERS
Sanitary pads and diapers are advanced engineered absorbent systems that combine textile technology, polymer science, and fluid mechanics to ensure comfort, hygiene, and leak protection.
They are made up of multiple functional layers, each designed for a specific role; The top sheet, usually a soft non-woven polypropylene or polyethylene fabric, allows fluid to pass through quickly while remaining dry on the skin. Beneath this is the Acquisition(Intake) and Distribution(Transfer) layer, which spreads liquid evenly to prevent pooling and leakage.
At the core of both products is a blend of cellulose fluff pulp and Super absorbent polymer (SAP), commonly sodium polyacrylate. SAP can absorb several hundred times its weight in liquid, forming a gel that locks fluid in place and prevents leakage even under pressure. This process relies on capillary action, osmotic absorption, and polymer cross-linking.
The Back sheet, made from microporous polyethylene film, acts as a liquid barrier while allowing air and water v***r to escape, ensuring breathability and permeability.
Additional components such as elastics, adhesives, and fastening systems improve fit and comfort.
While Sanitary pads are designed to manage more viscous fluids like menstrual blood, diapers are optimized for rapid absorption of urine, requiring higher SAP content and faster fluid distribution.
Overall, sanitary pads and diapers are everyday products engineered and put together by advanced and complex material science, demonstrating how textile and polymer engineering directly support health and comfort.