At 1/4 inch, Wilden makes two plastic pumps: the clamped P.025 (often written P025) and the bolted PS25. Both come in polypropylene or PVDF. PSG lists 24 P.025 builds (16 polypropylene, 8 PVDF) and 13 PS25 builds (10 polypropylene, 3 PVDF).
Polypropylene or PVDF?
In the build code, the letter after the slash shows the wetted material: P for polypropylene, K for PVDF. PSG’s figures for the same pump in each material:
P.025 PP (00-10075)
P.025 PVDF (00-9910)
PS25 PP (00-10191)
PS25 PVDF (00-10190)
Max flow
4.8 gpm (18 L/min)
4.8 gpm (18 L/min)
5.7 gpm (22 L/min)
5.7 gpm (22 L/min)
Max air pressure
125 psi (8.6 bar)
125 psi (8.6 bar)
120 psi (8.3 bar)
120 psi (8.3 bar)
Max solids
0.02 in (0.5 mm)
0.02 in (0.5 mm)
0.06 in (1.5 mm)
0.06 in (1.5 mm)
Dry suction lift
10 ft (3.0 m)
10 ft (3.0 m)
14 ft (4.3 m)
14 ft (4.3 m)
Shipping weight
3.4 lb (1.5 kg)
4.1 lb (1.9 kg)
2.6 lb (1.2 kg)
4 lb (1.8 kg)
Performance is the same in both plastics. What changes is chemical resistance and weight: PVDF handles a wider range of strong acids and oxidizing chemicals, and is heavier. Polypropylene covers many acids and alkalis at a lower weight.
One point that surprises some buyers: on these PSG pages the temperature limit is 175 °F (79 °C) for both materials, because the air side is polypropylene in every case. Choosing PVDF does not raise the pump’s listed maximum temperature.
If you are dosing a specific chemical, send us its name, concentration and temperature and we will tell you which of the two fits.
Example builds
Part No.
Build code
Elastomer
Material
00-10088
P.025/PZPPP/TEL/TF/PTV
PTFE
Polypropylene
00-10075
P.025/PPPPP/WFS/SS/PWF
Santoprene
Polypropylene
00-9608
P.025/PPPPP/BNS/TF/PBN
Buna-N
Polypropylene
00-10185
PS25/PPPPP/ZGS/GS/PBN
Bunalast
Polypropylene
00-10060
P.025/PPPPP/EPS/TF/PTV
EPDM
Polypropylene
All 37 plastic builds are listed in our part number lookup. Polypropylene builds: P.025 | PS25. PVDF builds: P.025 | PS25.
Genuine WILDEN P1500 and PS1500, the largest plastic Wilden diaphragm pumps: 3″ ANSI flanged, polypropylene or PVDF, up to 271 gpm (1026 L/min), 47 builds.
P1500: up to 195 gpm / 738 L/min. PS1500: up to 271 gpm / 1026 L/min (61.6 m³/h)
Flow Rate (m³/h)
P1500: max air 100 psi / 6.9 bar. PS1500: max air 125 psi / 8.6 bar
Head (m)
Compressed air; max 6.9 bar (100 psi) for P1500, 8.6 bar (125 psi) for PS1500
Genuine Wilden AODD Diaphragm Pumps & Spare Parts