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FX-101 Resilient Fiberfree Pads with P.T.F.E. - Expansion Bearings For: Bridges, Pipelines, Buildings

FX-101 was used in the following case studies:

Pedestrian Bridge Restored with Fox Products

DESCRIPTION:

The FX-101 Expansion Bearing is composed of an upper unit, a thin, stainless steel plate bonded to a sole plate and a lower unit composed of teflon bonded to a durable, resilient fiber-free pad. Sliding or translation occurs between the stainless steel and the teflon while deflection, rotation and load distribution are accommodated by the resilient pad. Complies with AASHTO standards.

UPPER UNIT:

Sole Plate: The sole plate shall conform to ASTM A-36, and the dimensions will comply with the details as shown on the structural drawings. All exposed surfaces must be given a prime coat of FX-408 two-component, zinc rich primer.

Stainless Steel: The stainless sheet shall be no less than 20 gauge, meeting ANSI, type 304 (ASTM A-240) specifications and have a mirror finish of less than 10 micro-inches R.M.S. (Root-Mean-Square) on the side in contact with the teflon. The stainless steel shall be a minimum of 1/4" smaller than the sole plate all around, and these shall be bonded together with a high temperature-resistant epoxy adhesive, or welded.

Epoxy: The epoxy adhesive shall meet the following requirements:

REQUIREMENT	TEST METHOD	VALUE
Flexural Modulus	ASTM D 790	2 x 10⁴
Safe Operating Temp.		- 60° to 145°C
Linear Expansion Co-efficient	ASTM D 696	4.8 X 10⁵
Bond Strength	ASTM D 1002	1000 p.s.i.
Tensile Shear at 77°F

LOWER UNIT:

TEFLON®: The teflon, self-lubricating bearing element shall be 1/16" thick and composed of 100% virgin (unfilled) polytetrafluorethylene polymer and shall meet the following requirements.

REQUIREMENT	TEST METHOD	VALUE
Hardness, Shore D	ASTM D 2240	60 + 5
Tensile Strength, p.s.i.	ASTM D 1457	2800 (min. avg.)
Elongation, %	ASTM D 1457	200 (min. avg.)

TEFLON® is a registered trademark of the DUPONT Corporation.

REQUIREMENT	TEST METHOD	VALUE
Deformation Under Load
%, 78°F, 2000 p.s.i. (1/2" X 1/2" X 1/32")	ASTM D 621	4 (max.)
Specific Gravity	ASTM D 792	2.14 to 2.21

BEARING PAD:
The resilient fiber-free pad shall meet the following requirements:

ELECTRICAL PROPERTIES:

Resistivity	Volume Resistivity 23°C 50% RH, Ohm-CM		8.3 x 10¹⁰
Surface Resistivity	23°C 50% RH, Ohm		4.0 x 10¹²
Resistivity	Impressed Voltage - 500
Dielectric Constant	23°C 50% RH, Frequency
	60 cps	8.55
	103 cps	7.82
	106 cps	6.0
Dissipation Factor	23° 50% RH Frequency
	60 cps	0.089
	103 cps	0.060
	106 cps	0.087
Dielectric Strength	Electrodes 1" apart 28°C oil temperature 500 vps rate of rise volts/mil 330

Tolerances: The expansion bearing total thickness will be +10%. The PTFE thickness shall be -0 + 1/64"

Co-Efficient of Friction: The co-efficient of friction between the self-lubricating bearing element (PTFE) and the stainless steel shall not be more than 0.06 at 800 p.s.i. compressive loading.

PHYSICAL REQUIREMENTS:

	TEST METHOD	VALUE
Hardness, Shore A	ASTM D 2240	90 +/- 5
Deflection	MIL-C-882C	800 psi-7%max.
Volume Swell	FED-STD-601	1 max.
	Method 6211, except immersion period shall be 24 + 1/4 hrs. The immersion medium shall be diesel oil in accordance with Type I of MIL-F-16884
Deformation	MIL-C-882C Mod.	15,000psi w/o Detrimental deformation. No ruptures
Permanent Set	MIL-C-882C Mod No Fabric Required	2000 psi- 2.0% max
Tensile Strength	ASTM D-412	5,500 psi min
Ultimate Elongation	ASTM D-412	250%-min

FOR INDUSTRIAL USE ONLY. KEEP AWAY FROM CHILDREN. 9/2004