WILDEN P1 1/2″ Aluminum AODD Pump: Diaphragm Guide

With the P1, the question we hear most is not about size but about the diaphragm. Wilden lists 20 aluminum P1 builds with six different diaphragm materials: Santoprene, PTFE, Buna-N, EPDM, Hytrel and FKM. The choice changes more than chemical resistance.

Rubber or PTFE: the published difference

	Santoprene build (01-2677)	PTFE build (01-2652)
Max flow	15.4 gpm (58 L/min)	14.4 gpm (55 L/min)
Dry suction lift	17 ft (5.2 m)	16 ft (4.9 m)
Diaphragm stroke	Full stroke	Reduced stroke
Min temperature	32 °F (0 °C)	40 °F (4 °C)
Max temperature	175 °F (79 °C)	175 °F (79 °C)
Shipping weight	13 lb (5.9 kg)	11.3 lb (5.1 kg)

PTFE resists almost every chemical, but it is stiffer, so Wilden runs it with a reduced stroke. That costs a little flow and suction lift. A rubber diaphragm gives full stroke and slightly better performance, as long as it is compatible with the liquid.

A rough guide

• Santoprene: a good general choice for water-based liquids, many acids and alkalis
• Buna-N: oils, fuels and many petroleum products
• EPDM: hot water, dilute acids and some ketones, but not oils
• Hytrel: good abrasion resistance and low temperature performance
• FKM: many aggressive chemicals and higher temperatures
• PTFE: the widest chemical resistance

This is only a starting point. Send us the liquid, its concentration and temperature, and we will check the compatibility before you order. All P1 builds are 1/2 inch NPT with center ports and handle solids up to 0.06 inch (1.5 mm).

Example builds

Part No.	Build code	Elastomer	Connection
01-2652	P1/AAPPP/TNU/TF/ATF	PTFE	Threaded
01-2677	P1/AAPPP/WFS/WF/SWF	Santoprene	Threaded
01-2653	P1/AAPPP/BNS/BN/ABN	Buna-N	Threaded
01-10973	P1/AAPPP/FSS/TF/AFS	Hytrel	Threaded
01-11018	P1/AAPPP/EPS/TF/ATF	EPDM	Threaded
01-2689	P1/AAPPP/VTS/VT/ATF	FKM	Threaded

Browse all 20 aluminum P1 builds: https://www.haquanpump.com/wilden-aodd-pumps/part-numbers?q=P1