08-06-2026 This guide provides a systematic comparison of the four main polyacrylamide (PAM) types — anionic, cationic, non-ionic, and amphoteric — based on their charge characteristics, working mechanisms, and ideal applications. It includes a selection decision matrix, application-specific recommendations (including CPAM ionic degree selection for sludge dewatering), and key parameters to verify when evaluating PAM products. For procurement professionals and plant engineers, this is a practical reference to match the right polymer chemistry to specific water treatment challenges.