Seats/Seals

SEAT INSERT MATERIALS
STARLINE CODE
SEALS MATERIALS
TEMPERATURE RANGE
Applications

Notes
C F
SOFT S REINFORCED PTFE
20% Carbon + 5% Graphite
-190
+250
-310
+482
Natural Gas, Steam Service, Diathermic Oil,Hydrocarbons, H2S, Medium Pressure, Low / High Temperature Higher Temp. and Pressure than VIRGIN PTFE.
Good for Steam Service
T VIRGIN PTFE -196
+200
-319
+392
Hydrocarbons H2S, All Chemicals, Natural Gas, low pressure All services subject to temperature limitation
HARD N DEVLON – V
POLYAMIDE – NYLONE
-100
+155
-148
+311
Hydrocarbons, H2S, All chemicals, Natural Gas, High Pressure Good for high pressure applications.
Not good for water
D DELRIN
ACETAL RESIN
-70
+95
-94
+203
Hydrocarbons Nace. Co2. High pressure, Low temperature Do not use for oxygen
P PEEK
POLYETHER KETONE
-80
+220
-62
+428
Hydrocarbons, Nace. For Tobacco and Nuclear Service High pressure
High temperature
E VESPEL SP 21
POLYMIDE
-200
+260
-328
+500
Good Chemical Resistance. For Gas, Oil, Petroleum. Not for Steam High pressure
High temperature
U UHMWPE
POLYETHILENE
-150
+150
-240
+300
Food and Tobacco industries. Nuclear Service Low pressure
Low torque
Z TEFZEL
EFTE (704-25)
-100
+180
-73
+350
Good Chemical Resistance. Nuclear Service Medium pressure.
Low temp. – High temp.
Y PFA -196
+260
-319
+500
Lower Porosity – Particularity Good to Avoid Polymerisation Medium pressure.
Low / Medium Temperature

 

SEAL MATERIALS
MATERIAL TYPE TEMPERATURE RANGE APPLICATION
“O” RINGS N NITRILE NBR -30°C / -22°F +120°C / +248°F Water service
M HYDROGENATED NITRILE HNBR -30°C / -22°F +160°C / +320°F High Pressure Water
E MODIFIED HYDROGENATED NITRILE HNBR -40°C / -40°F +160°C / +320°F Sweet gas mixture, Hydrogen Sulphide up to 10%, Amine Corrosion Inhibitors up to 5%, Methanol
v FLUOROELASTOMERS(VITON B) FKM -20°C / -4°F +220°C / +428°F Standard Viton used on lower pressures
V FLUOROELASTOMERS(VITON AED) FKM -20°C / -40°F +220°C / +428°F Sweet gas mixtures and armonic hydrocarbons. ED service
V FLUOROELASTOMERS(VITON GLT) FKM -40°C / -40°F +220°C / +428°F Lower temperatures than standard Viton
C PERFLUOROELASTOMERS (CHEMRAZ 528) FFKM -25°C / -13°F +250°C / +482°F Good chemical resistance, High temperature, H2S, Xylene, Toluene contents
K PERFLUOROELASTOMERS (KALREZ) FFKM -20°C / -4°F +327°C / +620°F Good extrusion and chemical resistance. Excellent resistance to Sour oil and Amine
A AFLAS FEPM +5°C / +41°F +200°C / +392°F Sour gas mixtures and amine based corrosion inhibitors. Good for hot water and steam
I SILICON+PFA -60°C / -76°F +240°C / +464°F Low temperature applications / Good chemical resistance
SPECIAL G EXPANDED GRAPHITE -240°C / -400°F +680°C / +1256°F Used on Metal Seated High Temperature valves
L PTFE+ELGILOY -196°C / -320°F +260°C / +500°F Good for Chemical Resistance and Low Temperature

 

FIRE SAFE SEAL
MATERIAL TYPE TEMPERATURE RANGE APPLICATION
G GRAPHITE -240°C / -400°F +680°C / +1256°F Back up seal for fire safe valves