All ladder side rails, rungs, ladder
mounting brackets and cage straps are to be FRP structural shapes
manufactured by the pultrusion process. Cage hoops and brackets
shall be produced by the open molded hand lay-up method. All
structural shapes shall be composed of fiberglass reinforcement and
resin.
* Fiberglass reinforcement shall be a combination of continuous
roving, continuous strand mat, bi-directional roving mat and
surfacing veil in sufficient quantities as needed by the application
and/or physical properties required.
* Resins shall be {Isophthalic Polyester or Vinyl Ester} with
chemical formulation necessary to provide the corrosion resistance,
strength and other physical properties as required.
* All finished surfaces of FRP items and fabrications shall be
smooth, resin-rich, free of voids and without dry spots, cracks,
crazes or un-reinforced areas. All glass fibers shall be well
covered with resin to protect against their exposure due to wear or
weathering .
* All pultruded ladder components shall be further protected from
ultraviolet attack (integral UV inhibitors in the resin) a synthetic
surfacing veil to help produce a resin rich surface.
* All FRP products shall have a tested flame spread rating of 25 or
less per ASTM E-84.
* The ladder side rail shall be 1-3/4" square tube with wall
thickness of 1/4" or greater. The rungs shall be 1-1/4" diameter
pultruded structural shapes, continuously fluted to provide a
non-slip surface. Rungs that are gritted as a secondary operation
shall not be permitted. Ladder wall and floor mount shall be
fabricated from pultruded angles, 3/8" minimum thickness.
* The ladder cage vertical bars shall be 1.5" wide by 5/8" pultruded
shapes to offer protection to workers from exposed hardware. Cage
hoops and cage brackets shall be manufactured by the open mold hand
lay-up process. All cage hoops shall be 3" wide by 1/4" thick
minimum.
* Type 316 stainless steel bolts shall be provided for attaching
ladder cage vertical bars to hoops, ladder hoops to brackets, ladder
cage brackets to the ladder, and wall brackets to the ladder.
* All rungs shall be both mechanically attached to the ladder with
stainless steel rivets and chemically bonded with epoxy. All ladder
and cage components are to be integrally pigmented yellow.
* The Ladder Systems meet or exceed OSHA requirements and building
code for safety and design.
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