WILDEN AODD Pump – Chemical Resistant, PTFE Diaphragm, Acid Transfer

PTFE is the diaphragm material Wilden offers for the most aggressive chemicals. Wilden lists over 700 WILDEN pump builds with PTFE diaphragms, across every body material.

What PTFE changes

PTFE resists almost all chemicals but is stiffer than rubber, so many PTFE builds run a reduced stroke. Wilden’s figures show the effect:

Build	Diaphragm	Max flow	Dry lift
P1 aluminum 01-2677	Santoprene, full stroke	15.4 gpm (58 L/min)	17 ft (5.2 m)
P1 aluminum 01-2652	PTFE, reduced stroke	14.4 gpm (55 L/min)	16 ft (4.9 m)
P2 stainless 02-12692	PTFE, reduced stroke	41 gpm (155 L/min)	9.1 ft (2.8 m)

Not every PTFE build is reduced stroke. Wilden lists the stainless XPS220 PTFE build 02-12927 as full stroke, at 52 gpm (197 L/min) with 17 ft (5.2 m) dry lift.

Pairing PTFE with the right body

• Polypropylene: many acids and alkalis at moderate temperatures
• PVDF: stronger acids, oxidizing chemicals and higher temperatures than polypropylene
• Stainless steel: solvents and chemicals where a metal pump is preferred

Chemical resistance depends on concentration and temperature, so send us the liquid data and we will check the combination.