Buying Guide

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Revision 3/31/2016
Virgin PTFE
Virgin PTFE is a good all-around, general purpose seating material. PTFE has outstanding resistance to chemical attack by a
broad spectrum of organic chemicals, inorganic chemicals and solvents and is generally considered chemically inert. PTFE is
a self-lubricating polymer with a very low coefficient of friction, which makes an excellent seating material for quarter-turn ball
valves.
15% Reinforced PTFE
NIBCO uses short strand fiberglass as a reinforcement for our mid-range ball valve products. Adding reinforcement increases
the pressure containing capabilities of PTFE by reducing its tendency to cold-flow.
Ball Valve Seat Materials
Color Code
Virgin PTFE resin has a natural pigment of WHITE.
Temperature Range
-20° to +400° F temperature range in ball valve applications.
Pressure Range
27" vacuum to 600 PSI non-shock water, oil or gas.
Unique Features
Best choice for low pressure sealing, lowest torque of all
PTFE polymers.
Typical Applications
Cold and hot potable water, HVAC chilled and hot water.
Evaporative cooling systems. Medical gas valves.
NIBCO Figure Number Designation “Y”
Product Availability
T/S-580/580-66
T/S-590/595-Y/66
T-560-BR-Y-20/66
T/S-FP-600
Color Code
15% reinforced PTFE is color coded BLUE. This pigment is
permanently molded into the PTFE polymer matrix.
Temperature Range
-20° to +400° F temperature range in ball valve applications.
Pressure Range
27" vacuum to 1,000 PSI non-shock water, oil or gas.
Unique Features
Greater resistance to cold-flow than virgin PTFE.
Typical Applications
Mid-range steam applications. Throttling and balancing of
hydronic heating and cooling systems.
NIBCO Figure Number Designation “R”
Product Availability
T/S-580-70/70-66
T/S-585-70/70-66
F-510/530-CS-R/S6-R
TC-580-CS-R
T-560-BR-R-20/66
T-570-CS-R/S6-R
T-580-CS-R/S6-R
T/K-595-CS-R/S6-R
TM/KM/BM-590/595-CS-R/S6-R
Chemical Compatibility
Please consult the most current edition of the NIBCO Chem-Guide for recommendations regarding chemical compatibility of material exposure to specific media and media-treatment additives. The
NIBCO Chem-Guide is a general guide on the topic of chemical compatibility and is by no means an exhaustive resource on the subject. Ultimately, proper material selection is the responsibility of the
installer and/or end-user, taking into account all aspects of a system’s design and intended use.
Galvanic Potential in Piping Systems
Galvanic corrosion or dissimilar metal corrosion is an electrochemical process that is created through the electrical interaction of two different metals under the influence of a conductive media (i.e.
an electrolyte). An electrolytic cell, much like a battery, is generated by these dissimilar metals using water as the electrolyte. The electrical charge, developed within the electrolytic cell, drives a
preferential attack on the more electrically active metal with the water acting as the recipient of the discarded metal ions. Such galvanic attack is often encountered in service where iron or steel
components are installed, and later corrode, in a largely copper piping system. Please consult NIBCO Technical Bulletin NTB-0714-01 Dielectric Products Relative to Electrolysis and Galvanic Corrosion.