International Building Code 2602.1
General. The following words and terms shall, for the
purposes of this chapter and as used elsewhere in this code,
have the meanings shown herein.
FOAMPLASTIC INSULATION. A plastic that is intentionally
expanded by the use of a foaming agent to produce a
reduced-density plastic containing voids consisting of open or
closed cells distributed throughout the plastic for thermal insulating
or acoustical purposes and that has a density less than 20
pounds per cubic foot (pcf) (320 kg/m3).
LIGHT-DIFFUSING SYSTEM. Construction consisting in
whole or in part of lenses, panels, grids or baffles made with
light-transmitting plastics positioned below independently
mounted electrical light sources, skylights or light-transmitting
plastic roof panels. Lenses, panels, grids and baffles that are
part of an electrical fixture shall not be considered as a
LIGHT-TRANSMITTING PLASTIC ROOF PANELS.
Structural plastic panels other than skylights that are fastened
to structural members, or panels or sheathing and that are used
as light-transmitting media in the plane of the roof.
LIGHT-TRANSMITTING PLASTIC WALL PANELS.
Plastic materials that are fastened to structural members, or to
structural panels or sheathing, and that are used as light-transmitting
media in exterior walls.
PLASTIC, APPROVED. Any thermoplastic, thermosetting
or reinforced thermosetting plastic material that conforms to
combustibility classifications specified in the section applicable
to the application and plastic type.
PLASTIC GLAZING. Plastic materials that are glazed or set
in frame or sash and not held by mechanical fasteners that pass
through the glazing material.
REINFORCED PLASTIC, GLASS FIBER. Plastic reinforced
with glass fiber having not less than 20 percent of glass
fibers by weight.
THERMOPLASTIC MATERIAL. A plastic material that is
capable of being repeatedly softened by increase of temperature
and hardened by decrease of temperature.
THERMOSETTINGMATERIAL. A plastic material that is
capable of being changed into a substantially nonreformable
product when cured.