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ASTM C 423-84a Sound Absorption Coefficients vs. Frequency:

(3/8" Snap-Trak® System w/Polyester) Freq. (Hz) Absorption (sabins) Coefficient (Sab/sq.ft.) 125 5.7 0.08 250 14.8 0.21 500 23.5 0.33 1000 31.2 0.43 2000 36.6 0.51 4000 41.5 0.58

Noise Reduction Coefficient (NRC): 0.35 In other tests, the Snap-Trak® system yielded the following results: Depth of Snap-Trak® 3/8" ½" 1" 2" Infill Material Fiberglass Polyester Fiberglass Fiber & Poly NRC Value: .35 .40 .75 1.00

TYPICAL NRC VALUES OF STANDARD IN-FILLS MATERIAL Fiberglass: Fiberglass: Polyester: Perforated Min. Fib. Brd. Rock Wool (Troy) THICKNESS ½" 1" 1" 3/8" 1" NRC VALUE .35 .75 .70 .25 .85

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