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definitions index
FOAM PLASTIC
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-diffusing system.
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.
THERMOSETTING
MATERIAL.
A
plastic material that is capable of being changed into a substantially
nonreformable product when cured.
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