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Polyester resin reinforced line posts shall be produced from unsaturated
polyester resin reinforced with E-glass. Posts shall be filled with an
appropriate filler material to form a rigid structural support member. The
post shall meet the strength requirements of ASTM F 1043 for heavy
industrial fencing. Posts shall be protected from UV and moisture
degradation by a protective veil impregnated with resin (0.2 to 0.3 mm 8 to
12 mil minimum) and an acrylic based (0.05 mm 2 mil minimum) coating
system. Posts shall exhibit corrosion and ultraviolet resistance as
demonstrated when exposed to accelerated environmental test chamber for not
less than 3,600 hours. The post shall show no structural failure (i.e.,
less than 10% loss of strength) as a result of exposure to moisture. Post
coating system strength shall be tested in accordance with ASTM D 4541 for
90% adhesion strength. Posts shall be [green] [black] [brown] in color.
Provide outside diameter as specified in ASTM F 1043 for round steel pipe.
2.3.4
Wood Posts
Wood posts shall be cut from sound and solid trees free from short or
reverse bends in more than one plane. Tops shall be convex rounded or
inclined. Posts shall be free of ring shake, season cracks more than 6 mm
1/4 inch wide, splits in the end, and unsound knots. Size and shape of
posts shall be as indicated. Posts shall be treated in accordance with
AWPA C1 or AWPA C4 as applicable.
2.4
BRACES AND RAILS
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NOTE: Normally rails will not be specified except
where appearance is important and the added cost is
justified. When top rails are not specified, top
tension wire will be used. Bottom tension wire will
be specified unless a bottom rail is required for
high security fence.
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ASTM F 1083, zinc-coated, Group IA, steel pipe, size NPS 1-1/4. Group IC
steel pipe, zinc-coated, shall meet the strength and coating requirements
of ASTM F 1043. [Braces and rails shall be [Group IA] [Group IC], steel
pipe, size NPS 1-1/4 or Group II,formed steel sections, size 42 mm (1-21/32
inch) 1-21/32 inch and shall be zinc coated (Type A) and polyvinyl
chloride-coated conforming to the requirements of ASTM F 1043.] Group II,
formed steel sections, size 42 mm (1-21/32 inch) 1-21/32 inch, conforming
to ASTM F 1043, may be used as braces and rails if Group II line posts are
furnished.
2.5
WIRE
2.5.1
Tension Wire
Tension wire shall be Type I or Type II, Class 4 coating, in accordance
with ASTM A 824.
2.5.2
Barbed Wire for Farm Style Fence
Barbed wire shall conform to ASTM A 121 zinc-coated, Type Z, Class 3, or
aluminum-coated, Type A, with 12.5 gauge wire with 14 gauge, round, 4-point
barbs spaced no mor than 125 mm 5 inches apart.
SECTION 02821A
Page 9
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