Metal pumps corrode rapidly when handling concentrated acids, alkalis, and oxidising chemicals. The HPP replaces metal in the wet end with injection-molded PP, PVDF, or UHMWPE, polymers selected for corrosive chemical duty where stainless steel, cast iron, or bronze are not compatible.
Chemical compatibility, concentration, pH, and temperature still determine final material selection. PP, PVDF, and UHMWPE have different resistance profiles, so the exact liquid duty must be reviewed before ordering.
The HPP casing is injection-molded from a single piece of PP, PVDF, or UHMWPE with top centerline discharge and integrated flanges. The joint-less wet end removes leak paths where corrosive liquid could penetrate and attack casing walls.
The semi-open impeller is compressor-molded from PP, PVDF, or UHMW with a particle shroud and glass-finished flow passage. This construction supports phosphoric acid with gypsum slurry up to 40% concentration and low NPSH chemical duty.
Standard PP operates from 50°C to 80°C, PPH from 90°C to 100°C, and PVDF from 100°C to 115°C. Correct selection depends on chemical name, concentration, pH, and operating temperature.