Polyphosphates (Other, NESOI)

Potassium polyphosphates and other condensed polyphosphate chains not separately enumerated serve as sequestrants, corrosion inhibitors, and nutrient sources in applications ranging from water treatment and food preservation to specialty fertilizers and industrial cleaning. The US schedule distinguishes potassium polyphosphates (2835391000) from the broader NESOI residual (2835395000), with a legacy combined line (2835390000) also present. Canada and Germany lead US supply under this heading, with Thailand and China as additional significant sources. Food-grade polyphosphates are subject to FDA admissibility requirements; importers should confirm the applicable regulatory pathway based on intended end use.