1. Diaphragm, Seat, and O-Ring Materials
Code
Application
Temperature
Wear Resistance
Available Forms
Nitrile
(none)
General purpose, petroleum fluids, ethylene glycol, water, small amounts of methanol
-30° to +200° F 1
O-Rings, Seats, Diaphragms
Polyacrylate H
Heat resistance, oils, natural gas
0° to +300° F .5
Ethylene Propylene EP
Steam, water, alcohols
-65° to +300° F
1.5
Highly Saturated
HSN
Petroleum fluids, H2S, CO2
-20° to +300° F 2
Polyurethane P
Petroleum fluids, CO2, abrasion, toughness
-40° to +200° F 5
Seats, 106P Diaphragm
Viton® V
Heat, acids, propane gasoline, no methanol, not for hot water or steam, not for wet CO2
-15° to +350° F
.75
O-Ring, Seats, Diaphragms
Geothermal EPDM
GEP
Steam, water, petroleum fluids
0° to +500° F
Seats HPMV PB
Aflas® AF
High heat, steam, amine, acids, bases, petroleum fluids, no methanol
25° to +450° F 3
O-Rings, Seats
Gylon® 3521 GY
High heat, high chemical resistance, highly resistant to gas permeation
-350° to +500° F 4
Seats, Diaphragms
Low Temp Nitrile
LTN
Petroleum, low temperature
-65° to +225° F
O-Rings, Diaphragms
Multi-Nylon MN
Petroleum, abrasion, water, steam
100° to +250° F
Seats