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Material Notes:
Description: RulonŽ is the Saint-Gobain
trade name for their family of proprietary PTFE compounds. This family of
materials offers the combination of high compressive strength, low coefficient
of friction, and excellent abrasion and corrosion resistance while running
without lubrication. They are used in bearing and seal applications from
temperature extremes of 400°F to over 500°F with and without additional
lubricants. A unique property of RulonŽ is the absence of stick slip, that is,
erratic low-speed motion. PTFE = polytetrafluoroethylene
488 Grade Bearing/Seal PTFE: Resistance to high operating temperatures,
excellent wear resistance, and compatibility with most mating surfaces, make
Rulon 488 non-lubricated dryer bearings the superior solution to the harsh
operating environments of veneer dryers. Unlike other bearings, Rulon 488 is
specifically designed to prevent expensive downtime caused by thermal shock.
When used at extreme temperatures and under heavy loads, Rulon 488 will deform,
but will not shatter. This helps to eliminate sudden failures and possible
damage to other dryer components. In addition, Rulon 488 bearings last three
times longer than conventional carbon bearings-providing significant cost
savings in the long run. Rulon 488 bearings are also easy to install and need no
maintenance, since they are self-lubricated. Turquois in color.
Suitable for environments of steam, wet, dry, vacuum type. Mating surface of
steel/stainless steel Rc 25 and higher, or painted metal/porcelain surfaces.
Material has electrical and thermal insulation properties. Markets for 488 grade
include Aerospace & Aviation, Agricultural, Appliances, Dairy/Food/Beverage,
Industrial.
Information provided by Saint Gobain Performance Products.
| Specific Gravity, 73°F |
2.25 |
|
| Tensile Strength @
Yield, 73°F |
2,000 |
psi |
| Tensile Elongation (at
break), 73°F |
150 |
% |
| Deformation Under Load |
3.0 |
% |
| Hardness, Durometer
(Shore "D" scale) |
D-60 |
|
| Coefficient of Friction
(Dry vs Steel) Dynamic |
0.10 to 0.30 |
|
| Maximum Static Bearing
Load (P) |
1000 |
psi |
| Maximum Unlubricated No
Load Bearing Velocity (V) |
400 |
ft/minute |
| Maximum Limiting PV (Unlubricated) |
10000 |
psi x ft/min. |
| Minimum Mating Surface
Hardness |
B-25 (64) |
Rockwell (Brinnell) |
| Embrittlement
Temperature |
-400 |
°F Min. |
| Continuous Service
Temperature in Air |
550 |
°F Max. |
| Short Term Service
Temperature |
600 |
°F Max. |
| Thermal Conductivity |
2.6 |
BTU-in/(hr/ft2
°F) |
| Water Absorption,
Immersion 24 Hours |
nil |
% |
| Water Absorption,
Immersion Saturation |
nil |
% |
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