3
COMPATIBILITY CHART
The chart below is only a guide to selecting the pump and
diaphragm material which is compatible with the fluid you
are pumping. Always read and follow the fluid supplier’s
recommendations on material and fluid compatibility.
WARNING
To reduce the risk of serious bodily injury and property
damage from component rupture, always follow these
precautions:
1. Never use fluids in this pump which are not com-
patible with the wetted parts listed in the Technical
Data on the back cover of this manual, or with the
diaphragm of this pump.
2. Read and follow all warnings regarding
TOXIC
FLUID HAZARD
on page 2.
3. Be sure to avoid contact with heated fluid which
may burn your skin.
Pumps with Aluminum Covers and Manifolds (Models 218–940, 218–942, 220–438 and 220–546)
Diaphragm
Material
Operating
Temperature
Range
Recommended for pumping:
Not recommended for pumping:
Buna–N
0–88
_
C
(32–190
_
F)
Water, oil, hydraulic fluids, most
hydrocarbons
Strong alkalies, halogenated hydrocar-
bons, highly polar solvents such as
ketones (acetone, MEK), ozone, alde-
hydes, amines, nitro–hydrocarbons,
esters, ethers
EPDM
0–100
_
C
(32–212
_
F)
Alcohols, weak alkalies, esters,
ketones, silicone oils, water, or-
ganic acids, aldehydes, amines
Halogenated hydrocarbons, hydrocar-
bons, silicate esters, ethers, animal
oils, vegetable oils
Polyester
Elastomer
0–100
_
C
(32–212
_
F)
Excellent resistance to alcohols,
hydrocarbons, water, silicone and
vegetable oils, organic acids and
alkalies. Good resitance to esters,
ethers and ketones.
Strong alkalies, halogenated hydrocar-
bons, inorganic acids, aldehydes,
most amines, aromatics
r
(PTFE)
0–100
_
C
(32–212
_
F)
Most chemicals
Halogenated hydrocarbons, very
aggressive acids
Pumps with Stainless Steel Covers and Manifolds (Models 220–434, 220–435, 220–436 and 220–545)
Diaphragm
Material
Operating
Temperature
Range
Recommended for pumping:
Not recommended for pumping:
Buna–N
0–88
_
C
(32–190
_
F)
Water, oil, hydraulic fluids, most
hydrocarbons
Highly polar solvents such as ketones
(acetone, MEK), ozone, aldehydes,
amines, nitro–hydrocarbons, esters,
ethers
EPDM
0–100
_
C
(32–212
_
F)
Alcohols, weak alkalies, esters,
ketones, silicone oils, water, or-
ganic acids, aldehydes, amines
Hydrocarbons, silicate esters, ethers,
animal oils, inorganic acids, vegetable
oils
Polyester
Elastomer
0–100
_
C
(32–212
_
F)
Excellent resistance to alcohols,
hydrocarbons, water, silicone and
vegetable oils, organic acids and
alkalies. Good resitance to esters,
ethers and ketones.
Inorganic acids, aldehydes, most
amines, aromatics
r
(PTFE)
0–100
_
C
(32–212
_
F)
Most chemicals
Very aggressive acids
PTFE
PTFE
