Building Codes
All grades and colors of Plexiglas^® sheet are classified as a CC-2 light transmitting thermoplastic material under the model building codes. Typical values for Plexiglas^® sheets are: self-ignition temperature (ASTM D1929) in a range of 740° to 880°F; smoke density rating (ASTM D2843 between 4 and 12%; and horizontal burn rate (ASTM D635) between 1.1 and 1.9 in/mm. Note: these are small-scale tests and should not be used to predict how a material will behave in actual fire.

Copies of the approvals of Plexiglas^® sheet under various codes will be made available upon request. In addition, reports on the status of Plexiglas^® sheet under Federal Government regulations will be provided promptly.

Assistance can be provided by Atulglas International code consultants and engineers in interpreting the codes for installations of Plexiglas^® sheet that constitute justifiable exceptions to existing restrictions.

Approvals and research recommendations of general interest include: ICBO Research Recommendation No. 1084; BOCA Report No. 91-24 and SBCC Report No. 91-80; New York City Board of Standards and Appeals Calendars 444-60SM, 657-63-SM; New York City Department of Water Supply, Gas & Electricity approval for use in signs and lighting fixtures; New York City MEA 107-69-M, MEA 146-80-M, MEA 139-80-M; California Fire Marshall File No. A2560-007.

Building Codes and Interior Insulating Windows
Interior window systems that utilize combustible plastics are not specifically addressed in most building codes. Some jurisdictions have permitted combustible interior window systems to be used in the same manner as combustible primary windows, which are controlled by building codes which impose limitations on their use. Under the model building codes, Plexiglas^® acrylic plastic is classified as CC-2 combustible, light-transmitting plastic material, and as such can be used in accordance with the limitations of the prevailing code.

In other instances, interior window systems have been considered as interior finish. Plexiglas^® acrylic plastic is not approved as an interior finish material under any building code. In these cases, consideration must be given to the type of occupancy, fire protection devices, structure, height, area limitations, separation requirements, and the manner in which the window systems respond to an interior fire.

It is important to note that regardless of how the window system is classified by regulatory officials, the approvals for Plexiglas^® sheet do not constitute an approval for an interior window system in which Plexiglas^® sheet may be utilized. Each window system must be approved by the jurisdiction in which it will be used. Additional information regarding applicable building codes for Plexiglas^® sheet can be obtained by calling our Polymer Technology Center in King of Prussia, PA at (215) 419-7049 or (800) 217-3258.

BUILDING CONSTRUCTIONS RELATED PUBLICATIONS
The following brochures and bulletins are available on request.
Designer's Guide to Plexiglas^® Acrylic Sheet (PLA - 3)
Plexiglas^® Physical Properties Manual (PLA - 22)
Plexiglas^® Fabricating Manual (PLA - 21)
Plexiglas^® Forming Manual (PLA - 53)
Plexiglas^® Painting Manual (PLA - 54)