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This blend (CSA) was formulated for use against itself as a slide material.
The CSA system consists of an upper and lower element. The PTFE slide surfaces in this system are nominally 3/32" thick and are control-bonded to a 10-gauge carbon steel (CS) back up sheet. Normally the upper element is larger than the lower element by the amount of anticipated movement.
The blended CSA material used for this bearing is composed of virgin (unreprocessed) PTFE resin tested per ASTM D4894 or ASTM D4895 and reinforcing agents including milled glass fibers. This structural material has the following representative mechanical and physical properties:
  • Tensile Strength: 2200 psi
  • Elongation: 225%
  • Specific Gravity: 2.17-2.22
    • Actual values per lot are available upon request which might vary due to processing factors.
    The design engineer shall determine the square inches of bearing area required for the lower element by dividing the load by the allowable pressure from the graph. The upper element is sized for the movement after the lower element is sized for load.
    CON-SERV Inc can supply any practical size cut from stock steel. Size is out to out of back-up plate.
    For ease of installation, CON-SERV recommends a back-up plate 1" larger than the CSA or CSB size to allow a 1/2" recess all around. This recess must be provided for plates requiring a seal weld.
    Certifications on the epoxy, steel and CSA material are available upon request.
    Unit of Measure

    Type

    		 N/A CSA

    Element

    		 N/A Lower

    Slide Surface Thickness

    		 N/A 3/32"

    Slide Surface Material

    		 N/A CSA

    Back-Up Plate Thickness

    		 N/A 10 GA

    Back-Up Plate Material

    		 N/A Carbon Steel

    Size

    		 N/A 8" x 8"

    Lip

    		 N/A 50L

    Tensile Strength

    		 N/A 2200 psi

    Elongation

    		 N/A 2.25 %

    Specific Gravity

    		 N/A 2.17-2.22

    N/A

    • Slots and Holes If bolts pass through the elements, usually the upper element is slotted for movement; the lower element has holes in it. Add (2) slots 13/16 inch x 2 inch upper and (2) 13/16 inch holes lower.
    • Studs or Anchors If studs or anchors are welded to the back-up plate, use a back-up plate with a thickness approximately equal to the stud diameter. Add (2) 1/4 inch (Dia.) x 4 inch Nelson Studs.
    • High Temperature If the Bearing Point temperature exceeds 300°F add HT to the fallout.

    N/A

    • The coefficient of friction plotted is a maximum value alter first movement breakaway. The friction values do not vary significantly with temperature; however, they will rise with increased speed.The graph values will increase approximately 45% for a speed increase to 10 in./min.
    • The epoxy compound used by CON-SERV Inc. has been tested and formulated for bonding CSA and CSB to backing materials. The bond strength developed has a safety factor of from 5 to 6 on a sliding shear, assuming no friction between the special PTFE and the back-up plate. We insure these strengths at temperatures between 300°F and 500°F with a special epoxy for HT bearings.

    N/A

      Wear
      Wear of CON-SLIDE bearings utilized in thermal expansion applications designed under the guidelines presented herein is negligible.CON-SERV Inc has independent laboratory tests available to certify to the performance of their bearings in cold weather climates. The tests were conducted per the original Alyeska Pipeline specification. Thermal cycling from -70°F to +100°F was performed on both CSA and CSB CON-SLIDE bearings. They proved to perform excellently.


      Ultraviolet Testing
      Tests indicate that our CSA and CSB materials show no ill effects from a time-accelerated test set up. The bearings once in place are protected by the envelope steel on either side of the CSA or CSB material as well as shading by the structure.


      Quality Control
      Our in-house Quality Control System insures the highest finished product quality. The system monitors the production from incoming raw materials to work in-progress to finished product. This system has been accepted by many of the major engineering and construction firms in the United States. These include Bechtel, Raytheon, Black and Veatch, Brown and Root, Foster Wheeler, Fluor Daniel, Stone and Webster and Jacobs Engineering.

    N/A

      The following specification for CON-SLIDE Slide Bearings (Type CSA) will give the engineer a quality product when installed
      The bearing pads, upper and lower units, shall be CON-SLIDE Type CSA elements. The sliding surfaces shall be a nominal 3/32 inch glass-filled virgin PTFE factory bonded with a tested epoxy to a steel back-up plate. The bonding shall be done in a heated bonding press under a controlled time and pressure.
      The coefficient of friction shall average 0.06 under a compressive load ot 2000 psi. The compressive creep shall be a maximum of 2% at 2000 psi and 70°F.
      The elements shall be flat, clean and prepared for installation in the structure. Slols and holes if required shall be fabricated in the bearing manufacturer's plant.

    N/A

      CON-SLIDE Bearings with PTFE flush with the steel back-up plate should be stitch welded only for attachment to the structure. A fillet weld 1 inch long every 6 inch on center each side of an element is satisfactory. Usually (1) tack weld each side is sufficient for elements 6 inch on a side or smaller. The recessed PTFE type hearing can be stitch welded or seal welded. Minimize heal input into the bearing with a skip and fill technique for seal welding (300° for standard bond and 500° for HT Bond).
      A CON-SLIDE set usually consists of the large pad or element being the upper unit over the smaller lower pad, thus eliminating the possibility of accumulating dirt or contaminants on the interface. The bearings will function with a larger lower pad, how ever. The PTFE surfaces of the bearings shall be maintained clean and free from grit, dirt or grease. Bearing elements with slots or holes should be welded in place for location. The hearing slide surfaces must be protected during welding and maintained clean and free from foreign matter. The surface (if PTFE) must not be exposed to the direct rays of sunlight. Keep the PTFE surfaces covered.
      Remove vinyl masking from stainless steel slide surfaces before final placement in the structure.
      Do not scratch or mar surfaces.

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