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Materials Selection Chart

Each type of packing fiber material exhibits certain characteristics to control fluid loss in valves, shafts, rods and other rotating equipment. This chart explains the different packing fibers and their uses.

ACRYLICS
Acrylic fibers soften at temperatures approaching 400 degrees F (204 degrees C). In most environments above 350 degrees F (177 degrees C), shrinkage may reduce the fiber by as much as 10%.
3000T - Most general service plant applications.
3000G - A wide variety of solvents, alkalies, mild acids, oils and water.
3000N - Alkalies, mild acids, solvents, steam and oils.

ARAMIDS
This fiber makes an extremely durable packing that is a superior replacement for asbestos packings especially in applications with slurries and abrasive fluids. The high strength and rigidity of this fiber also make it well suited  for high pressure sealing applications.
300 - Mild chemicals, oils, mild caustics, hydrocarbons, aromatic and aliphatic solvents. Especially suited for salt solutions, slurries, and other abrasive services.
with Aramid corners
8000T-K - Water, waste water, oils, greases, weak acids, alkaline solutions, and paper mill applications.
3000T-K -
8000T-K
8100BIL-K


CARBONACEOUS

Carbon and Graphite
The low modulus characteristic allows both types to be bent or wrapped around small diameter shafts without damaging the filaments. Both have high thermal conductivity that allow them to be used at higher temperatures.
Both yarns are inert to most chemicals, exhibit excellent thermal stability and have low frictional coefficients. High purity grades are used for the demanding requirements of nuclear applications.
Carbon and Graphite
4000G - Most high temperature corrosive acid and caustic applications. It is not recommended for strong oxidizer applications.
Carbon and PTFE
4000 - Hydrocarbons, virtually all chemicals, and water services, including pulp and paper applications.
Graphite
5000 - Steam, water, oil, solvents, alkalis, acids, and most chemicals. Exceptions are oleum, fuming nitric acid, aqua regia, and fluorine. Requires bull rings for high pressures.
5000C - Steam, water, oil, solvents, alkalis, acids, and most chemicals. Exceptions are oleum, fuming nitric acid, aqua regia, and fluorine.
5000-OCC - Extreme high temperature, high pressure, corrosive acid and caustic applications
8000G - Most high temperature corrosive acid and caustic applications, including nuclear services.
8000 - Most high temperature corrosive acid and caustic applications, including nuclear services.

METALS
Lead, copper and aluminum are readily moldable, heat conductive metals used in packings. Lubricated lead foil rings are frequently used by themselves or combined with other materials to equalize load deformation on installed packing.
Copper is used primarily as end rings (bull rings) on slow reciprocating, worn or non-concentric shafts.
Copper
895 - Temperatures up to 1000 degrees F and pressures up to 1000PSI. Normally used as anti-extrusion rings.
Aluminum
8011 and 8013 - Oil, water, steam, ammonia, heat transfer fluids, and mild chemicals. Recommended for hot oil charge pumps, boiler feed pumps, centrifugal equipment, reciprocating equipment, and valves. Contact FSS for pricing and specifications.
Lead
8010 and 8012 - Oils, distillates, water, salt water, and other general services. Recommended for centrifugal and rotary shafts, reciprocating equipment, and valves. It can be used as end rings to prevent softer packing from extruding. Contact FSS for pricing and specifications.


PHENOLIC/SPECIALTY
320 - Water, oils, hydrocarbons, most chemicals, and the pulp and paper industry. Non-staining and non-abrasive. Recommended for rotary and centrifugal shafts, reciprocating applications, and valves.

PTFE
PTFE fibers have an unusually high resistance to chemicals and heat, exceptionally low levels of friction and adhesion, as well as significantly greater resistance to cold flow.
PTFE fibers offer outstanding performance in highly corrosive environments. pH range of 0 to 14 and can give continuous service up to 550 fegrees F. Some PTFE fibers are suitable for oxygen service and food and drug use.
Dry
344 and 344T - A wide range of process chemicals and concentrated acids.
Lubricated
344BIL - Water, steam, concentrated acids and caustics, solvents, oils, fatty acids, detergents, aggressive gases, resistant to gamma and neutron rays, hydrogen, heat transfer oils, and most other chemicals and solvents. Specifically suited for high pressure valves.
Graphite and Lubricant
8000T - GFO -  Water, steam, concentrated acids and caustics, solvents, oils, fatty acids, detergents, aggressive gases, resistant to gamma and neutron rays, hydrogen, heat transfer oils, and most other chemicals and solvents. Specifically suited for high pressure valves.
8100BIL - A wide range of services including corrosive applications.
8200BIL - A wide range of services including corrosive applications.

VEGETABLE
Flax, jute, ramie and cotton are the natural fibers used in packings and have been used in packings longer than the man-made fibers. The chief advantage is their low price. The chief disadvantage is they have poor heat and chemical resistance.. They have very poor resistance to acids, but fairly good resistance to alkalis.
921 - Ambient water, cold oil, brine, and other general services.
345 - Cold water, cold oil, brine.
921G - Cold water, cold oil, brine, hydraulics.

Contact FSS, 715-675-2344, for packing recommendations for your specific application.