(polytetramethyleneether glycol) polyether urethane elastomer, with the
following unreinforced properties:
a.
Shore A. hardness, ASTM D 2240, [80 to 95] [_____] to [_____].
b.
Tensile strength, ASTM D 412, [19.3] [_____] MPa [2800] [_____]
psi minimum.
c.
Elongation (ultimate), ASTM D 412, [300 percent] [_____] minimum.
d.
Tear strength, ASTM D 470, [1.25] [_____] kg per mm [70] [_____]
Lbs/inch minimum.
e.
Flex life (Ross), ASTM D 1052, [200,000] [_____] cycles minimum.
f.
Abrasion resistance (NBS), ASTM D 1630, [100] [_____] minimum.
2.3.2
Filament Wrap
If filament reinforcing is required by the Contractor's design, construct
each filament reinforcing wrap of continuous filaments applied in a helical
pattern, at a helix angle of 0.79 to 1.05 rad 45 to 60 degrees to the
longitudinal axis of the buoy. A wrap shall consist of two such filament
helixes of equal but opposing helix angles. The spacing between the
filaments in the same helix shall be no more than 3 mm 1/8 inch, measured
in a direction parallel to the longitudinal axis of the fender. Each wrap
shall extend along the entire longitudinal axis of the fender and shall
also encase the fender end fittings and secure them to the fender body.
2.3.3
Filament Reinforcing
If filament reinforcing is required by the Contractor's design, the
reinforcing filaments in the outer skin shall be nylon tire cord of 0.00028
kg per m 2540 denier weight with the following properties:
a.
Breaking strength, [236] [_____] N [53] [_____] pounds
b.
Elongation (ultimate), [18] [_____] percent
2.3.4
Hardware
The internal chain connecting the two end fittings and the two end fittings
shall be galvanized in accordance with ASTM A 123 or ASTM A 153/A 153M as
appropriate. The chain and end clevis fitting shall have a minimum
ultimate tensile capacity of [640,512] [_____] N [144,000] [_____] pounds.
The internal chain and end clevis fitting shall have a minimum ultimate
tensile capacity of [578,240] [_____] N [130,000] [_____] pounds. Shackles
shall be [45] [_____] mm [1 3/4] [_____] inches and shall have a minimum
ultimate tensile capacity of [289,120] [_____] N [65,000][_____] pounds.
2.3.5
Color
Fender skin color shall be black throughout the entire thickness.
Galvanized hardware shall be unpainted.
2.3.6
Repairability
The fender casing shall be repairable in the event of tears or punctures in
the elastomer skin. The repaired area shall have not less than 90 percent
SECTION 02396
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