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Class A Fire Rated Crown Moldings

Class A Fire Rated Crown Moldings

Published: 08/15/2013 02:08:00 AM


We're proud to be representing some of the highest quality polystyrene crown moldings that have officially received an ASTM E-84 Class "A" fire rating!


The ASTM E-84 test measures the surface burning characteristics of building materials, including flame spread and smoke index. Building code officials recognize the ASTM E-84 rating system as the standard method for testing and a Class A is the highest rating a product can score.


The test was done on a 5-inch polystyrene foam crown molding and the following results were obtained:


Flame Spread Index Smoke Developed Index
5 85

With classification categorized as:


Class Flame Spread Index Smoke Developed Index
A 0 - 25 0 - 450
B 26 - 75 0 - 450
C 76 - 200 0 - 450
*Class A, B, and C correspond to Type I, II, and III respectively in other codes

With over 20 different crown molding profiles that are now Class "A" fire rated you are bound to find the perfect design and size to meet your project requirements. To make the process easier we have complied a list of polystyrene foam crown moldings that have the ASTM E-84 Class "A" fire rating:


Profile Product Height Projection Face Length
Class A Fire Rated Polystyrene Foam Molding - MC9801 MC9801-43-1/2 in.2 in.4 in.8 ft.
MC9801-64-1/2 in.2-1/2 in.5-1/8 in.8 ft.
MC9801-75-1/2 in.3 in.6-1/4 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9802 MC9802-43-1/2 in.1-11/16 in.3-7/8 in.8 ft.
MC9802-64-1/2 in.2-1/4 in.5 in.8 ft.
MC9802-75-1/2 in.2-11/16 in.6-1/8 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9803 MC9803-43-1/2 in.1-7/8 in.3-15/16 in.8 ft.
MC9803-64-1/2 in.2-1/4 in.5 in.8 ft.
MC9803-75-1/2 in.2-3/4 in.6-1/8 in.8 ft.
MC9813-64-1/2 in.2-1/4 in.5 in.8 ft.
MC9813-75-1/2 in.2-3/4 in.6-1/8 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9804 MC9804-43-1/2 in.1-3/4 in.3-15/16 in.8 ft.
MC9804-64-1/2 in.2-7/16 in.5-1/8 in.8 ft.
MC9804-75-1/2 in.2-15/16 in.6-1/4 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9805 MC9805-43-1/2 in.1-3/4 in.3-15/16 in.8 ft.
MC9805-64-1/2 in.2-3/8 in.5-1/16 in.8 ft.
MC9805-75-1/2 in.2-3/4 in.6-1/8 in.8 ft.
MC9815-64-1/2 in.2-3/8 in.5-1/16 in.8 ft.
MC9815-75-1/2 in.2-3/4 in.6-1/8 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9806 MC9806-43-1/2 in.1-3/4 in.3-7/8 in.8 ft.
MC9806-64-1/2 in.2-7/16 in.5-1/16 in.8 ft.
MC9806-75-1/2 in.3-1/16 in.6-1/4 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9820 MC9820-98 in.2-3/8 in.8-5/16 in.8 ft.
Class A Fire Rated Polystyrene Foam Molding - MC9821 MC9821-74-3/8 in.4-3/8 in.6-3/16 in.8 ft.