4" Pyramid Foam
AP4
For maximum sound absorption, the 4 inch pyramid foam is the product for the job. Excellent at absorbing low frequency waves, it provides maximum deadening capability and functions in the largest areas, like gyms or concert halls.
Overall NRC: 0.65
To view the full PDF report of our acoustical test results, see the resources section (below).
Flammability Test Results
Classification: Class A
Flame Spread Index: 25
Smoke Developed Index: 250
Acoustical Performance Data: NRC Ratings for Pyramid Foam
Leading Competitor Comparison: Acoustic Foam Product Comparisons
Flammability Test Results: ASTM-E84
Physical Data Sheet: Acoustic Foam Physical Data Sheet
Frequently Asked Questions: FAQ
How To: How To Use Spray Adhesive with Acoustic Foam (PDF)
Manufacturing Tolerances
Products may carry a size tolerance depending on the style and job. Please see our Tolerance Table.
Color Availability
Size and quantity selections will affect color option availability.
Pyramid vs. Wedge Absorption
To create the pyramid style, this foam must pass through our machine twice, resulting in a higher cost than the wedge for a more visually pleasing product. With less overall mass than our wedge foam, it provides about 76 percent as much absorption than the wedge, but has a better diffusion rate.
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