San Diego Plastics
2220 McKinley Avenue
National City  CA  91950
800/925-4855   619/477-4855   FAX 619/477-4874

RULON®

Rulon® is a specially compounded form of TFE fluorocarbon and other inert ingredients.

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Rulon® is a specially compounded form of TFE fluorocarbon and other inert ingredients.


Rulon® A was introduced to industry in 1952 as a plastic bearing material with low coefficient of friction and an excellent abrasion resistance to corrosion. It immediately found a great number of applications as a bearing material because it required no lubrication and was capable of performing under severe temperature (-400° to +550°F.) and corrosive conditions. Rulon® A has a 1,000-fold increase in wear resistance over TFE, lower deformation under load, greater stiffness and higher compressive strength.

Today Rulon® is widely used for electrical, mechanical and chemical applications in industry.

Since the advent of Rulon® A, a number of other formulations have been developed for special uses such as Rulon® 123, 125, 142, 488, 641, 998, 999, DC1042, DC7035, AR, B, E, F, H, J, K, LR, W2, XL and II.

Rulon® Material Selection Guide

Rulon® is available in numerous standard forms such as extruded rod, tubing, skived tape, molded rods and tubes, sheets and shapes molded to specifications. Rulon® is readily machinable in a manner similar to TFE and may be surface treated for bonding.

With the high cost of fluorocarbons, reducing the amount of material needed substantially reduces the cost of parts. For example, the use of Rulon® tape, wherever possible, provides low cost parts with all the advantages of a filled TFE fluorocarbon - better wear resistance, reduced deformation under load, and lower expansion characteristics.

Parts are made by stamping or post forming to the desired shape. Rulon's plastic memory is useful in insuring that a formed part provides a tight seal in service. Stamped washers can be formed into low cost lip seals with a memory, often making it possible to eliminate associated hardware. Pump cups so made of Rulon® can operate from -400° to +550°F. dry or in almost any fluid without swelling. Rotary rod-end seals can be formed by drawing out the I.D. of the washer over the rod to make a hat-shaped seal. Inexpensive Rulon® valve stem packing can be formed the same way.

Low cost bearings such as the T-Liner bearings pictured below are made of 0.015 to 0.030 inch tape, and are snapped into metal retainers, offering the same surface performance as massive pieces but with improved heat transfer, lower deformation and easy replacement. These bearings run unlubricated continuously at 20,000 PV* and intermittently at 50,000 PV. Tape bearings an be retained without their own holders by designing undercuts in the housing or shaft shoulders.

Slit Rulon® tape can be cut and wrapped around a piston ring groove to provide oil less cylinder operation. Such rings are low in cost, quiet and unaffected by most fluids.

Rulon® can be treated so that it is bondable (using epoxy adhesives) to most substrates such as wood or metal. This provides low-friction wear surfaces, half bearings and siding surfaces with the strength of the substrate. Tape can be bonded to rubber for seals and packing that combine the elasticity of rubber and the surface characteristics of Rulon®.

Rulon® tape is used as an abrasion barrier on high-temperature insulated wire.

Using Rulon® in thin sections allows for a variety of applications such as formed cups or seals, torque-control bushings, and clutch face plates.

Where to use Rulon®:
Low cost, high performance dry bearings for continuous service to 20,000 PV or intermittent service to 50,000 PV.
Low temperatures to -400°F., where oils are useless.
High temperatures to 550°F.
Corrosive substances, non lubricating fluids, high or low humidity.
Lubricated applications where wear may occur during starting and stopping.
Oscillating bearings or any case where stick-slip is undesirable.
Space and weight-saving applications.
Where bearing lubrication is undesirable or impossible.

Rulon graphic formula

Rulon graphic Sleeve Bearing Rulon graphic Flange Bearing
Rulon graphic Thrust Bearing Rulon graphic T-Liner bearing
Rulon® T-Liner bearings consist of a steel shell with retaining lips. Inserted is a removable Rulon® tape liner. The Rulon® liner is retained in a manner to allow it to expand and contract circumferentially, so that it is free to adjust without changing the I.D. of the bearing. Rulon® inserts are also stocked for use where the outer shell is not required.
Standard Stock Sizes for Rulon Bearings .pdf

TYPICAL FABRICATED PARTS IN RULON®
Rulon Bushings Bushings are machined to give wear-resistant bearing surfaces. They can be press fit, stacked, flanged, hot cast, etc. PV values up to 20,000 are obtainable without lubrication. Rulon Screw Machine Parts Screw machine parts of Rulon® for cams, bushings, rollers, etc. can be machined to close tolerances.
Rulon Bearings Bearings are produced economically by inserting slit and cut sections of tape. Rulon O-Rings O-Rings are available in Rulon® in all standard sizes. Rulon® has low breakaway friction, is not attacked by chemicals and oils, and operates lubrication-free.
Rulon Thrust Washers Thrust washers in either molded shapes or in low cost washers stamped from Rulon® tape or sheet, act without lubrication at high loads and speeds. They are not affected by chemicals or corrosive conditions. Rulon Gaskets and Packings Gaskets and Packing can be molded, machined or stamped in Rulon® for flats, rings, U-Cups, V-Rings, chevrons, etc. Rulon® shows less deformation under load than pure TFE.
Bonded Rulon Tape Bonded Rulon® Tape adhered with epoxy adhesive can withstand tensile shear strengths as high as 1,000 psi. Bonding tape to metal or wooden substrates, etc. provides low-friction wear surfaces for parts such as roll support half bearings, sleeve bearings, feeder chutes and sliding conveyors. Rulon Piston Rings Piston Rings of Rulon® provide increased service life and low maintenance in non-lubricated compressors and chemical process compressors. Rulon® offers maintenance and replacement savings in almost all applications where reduced wear, heat resistance, chemical inertness and toughness are required.
  Pump Cups and Seals Pump Cups and Seals formed from tape have a plastic memory which ensures tight sealing.  

FORMULATION COLOR USES
AR Maroon Best combination of flexibility and load carrying properties. Recommended for seal applications. Good general insulative and chemical properties
J Dull Gold Lowest coefficient of friction of any reinforced PTFE. Can run on both non-ferrous and non-metallic mating surfaces like 316 stainless steel and brass.
LR Maroon Standard bearing material used in sleeve, flange, thrust and T-Liner bearings.

PROPERTIES OF RULON® AR
Coefficient of Thermal Expansion in/in/DegreeF X 10E-5 7.8
Deformation Under Load % 5 @ 1500 PSI
Elongation Percentage 175
Flammability UL 94 Non-Flammable
Hardness Durometer Shore "D" Scale D-60-75
Izod Impact ft lb/in 6
Specific Gravity 2.24
Tensile Strength Psi 2000
Water Absorption Immersion 24 Hours % 0

PROPERTIES OF RULON® J
Deformation Under Load % 3.0@1500 PSI
Dielectric Strength Short Time Volts/mil 200
Elongation Percentage 180
Flammability UL 94 Non-Flammable
Hardness Durometer Shore "D" Scale D-60
Specific Gravity 1.95
Tensile Strength Psi 2000
Volume Resistivity ohm-cm 8.2 x 10E18
Water Absorption Immersion 24 Hours % 0

PROPERTIES OF RULON® LR
Coefficient of Friction Dry vs. Steel 0.15-0.25
Coefficient of Thermal Expansion in/in/DegreeF X 10E-5 8.2
Continuous Service Temperature in Air °F 550
Deformation Under Load % 3.0 @ 1500 PSI
Dielectric Constant 60 HZ 2.5
Dielectric Strength Short Time Volts/mil 400-500
Elongation Percentage 150
Flammability UL 94 Non-Flammable
Hardness Durometer Shore "D" Scale D-60-75
Izod Impact ft lb/in 6
Specific Gravity 2.27
Tensile Strength Psi 1500
Volume Resistivity ohm-cm 1.0 x 10E15
Water Absorption Immersion 24 Hours % 0
Water Absorption Immersion Saturation % 0

 

 


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