for: audimute soundproofing sound absorption · pdf filethe results reported apply only to the...

FOR: Audimute Soundproofing Sound Absorption Beachwood, OH RAL™-A13-341 CONDUCTED: 5 December 2013 of 5 ON: Rigid eco-C-tex® 2' x 2' Ice Cube Audimute Acoustic Coating (Baffle Mounting)

RAL IS ACCREDITED BY THE US DEPARTMENT OF COMMERCE, NATIONAL VOLUNTARY LABORATORY ACCREDITATION PROGRAM FOR SPECIFIC ACOUSTICAL TEST METHODS. THE LABORATORY'S ACCREDITATION OR ANY OF ITS TEST REPORTS IN NO WAY CONSTITUTES OR IMPLIES PRODUCT CERTIFICATION, APPROVAL OR ENDORSEMENT BY NIST OR RAL. THIS REPORT SHALL NOT BE MODIFIED OR PARTIALLY REPRODUCED WITHOUT THE WRITTEN APPROVAL OF RAL.

THE RESULTS REPORTED APPLY ONLY TO THE SPECIFIC SAMPLE SUBMITTED FOR MEASUREMENT; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SPECIMEN.

TEST METHOD The test method conformed explicitly with the requirements of the ASTM Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method: ASTM C423-09a and E795-05. Riverbank Acoustical Laboratories has been accredited by the U.S. Department of Commerce, National Institute of Standards and Technology (NIST) under the National Voluntary Laboratory Accreditation Program (NVLAP) for this test procedure (NVLAP Lab Code: 100227-0). A description of the measuring procedure and room qualifications is available separately.

DESCRIPTION OF THE SPECIMEN The test specimen was designated by the manufacturer as Rigid eco-C-tex® 2' x 2' Ice Cube Audimute Acoustic Coating (Baffle Mounting). A visual inspection by Riverbank staff verified the manufacturer's description, further disclosing a rigid cotton fiber acoustical core with white paint coating on face and edges. The specimen consisted of 16 sound absorbing units. Each unit was measured as 609.60 mm (24.00 in.) wide by 609.60 mm (24.00 in.) long and 35.81 mm (1.41 in.) thick. Each sound absorbing unit had an absorptive area (all exposed surfaces) of 0.83 m2 (8.94 ft2). The total absorptive area (all exposed surfaces) of all sound-absorbing units is 13.29 m2 (143.04 ft2) . The array of units covered 9.29 m2 (100.0 ft2) of chamber floor surface (total treated area). The average weight of each unit as measured was 1.09 kg (2.40 lbs). The specimen was tested in the laboratory's 292.0 m3 (10,311.0 ft3) test chamber. The room temperature at the time of the test was 21.4±0.1ºC (70.4±0.2ºF) and 63.5±0.1% relative humidity. The atmospheric pressure was 98.8 kPa. MOUNTING J The specimen is an array of spaced sound absorbing baffles suspended from cable. This approximates the mounting method of a typical ceiling baffle installation. The baffles were evenly distributed in four staggered rows of four units each. Baffles were spaced 305 mm (12 in.) apart. Rows were spaced 610 mm (24 in.) apart.

Audimute Soundproofing RAL™-A13-341 5 December 2013 of 5



Figure 1 - Specimen mounted in the test chamber.

Figure 2 - Detail of the test specimen.




Note: There is currently no standardized method for calculating Absorption Coefficients from spaced object absorbers. The sound absorption performance of spaced object absorbers should not be compared directly with specimens tested as a single rectangular area (e.g. mounting types A, E, etc.). TEST RESULTS

1/3 Octave Center Frequency

(Hz)

Sabins per Unit

Total Absorption

In Sabins

100 0.77 12.27 ** 125 1.04 16.67

160 1.28 20.50

200 1.46 23.43 ** 250 2.40 38.42

315 2.80 44.81

400 3.44 55.02 ** 500 4.79 76.60

630 5.55 88.85

800 6.60 105.54 ** 1000 7.41 118.55

1250 7.91 126.54

1600 7.98 127.73 ** 2000 8.00 127.95

2500 7.97 127.49

3150 7.98 127.63 ** 4000 7.64 122.28

5000 7.30 116.82 Tested by______________________________ Approved by___________________________ Marc Sciaky Eric P. Wolfram Experimentalist Laboratory Manager




SOUND ABSORPTION REPORT Rigid eco-C-tex® 2' x 2' Ice Cube Audimute Acoustic Coating (Baffle Mounting)




Appendix to ASTM C423 Sound Absorption Test Extra Frequency Data Product Description: Rigid eco-C-tex® 2' x 2' Ice Cube Audimute Acoustic Coating (Baffle Mounting) (See Full Report) Riverbank Acoustical Laboratories is accredited to perform sound absorption coefficient measurements for the frequency range of 100Hz to 5,000Hz. However, we calculate sound absorption values at additional test frequencies as a service to our clients. Although these measurements were made in accordance with the procedures described in ASTM C423-09a, they do not qualify as part of the standard. Since the results are representative of the test environment only, they are unofficial and intended for research and development guidelines rather than for commercial purposes. The sound absorption values at additional frequencies were as follows:

RAL-A13-341

1/3 Octave Center Frequency Sound Absorption Sound Absorption (Hz) Sabins per Unit Total Sabins

40 1.22 19.53 50 -1.70 -27.23 63 0.52 8.39 80 0.27 4.27

6300 7.14 114.21 8000 7.04 112.68 10000 6.96 111.30

Riverbank Acoustical Laboratories 1512 S. Batavia Ave.

Geneva, IL 60134-3302 Tel: 630-232-0104 Fax: 630-232-0138 Email: [email protected]

FOR: Audimute Soundproofing Report Referenced: RAL™-A13-341 Beachwood, OH Page 1 of 2 CONDUCTED: 5 December 2013 ON: Rigid eco-C-tex® 2' x 2' Ice Cube Audimute Acoustic Coating (Baffle Mounting) (See Full Test Report for Details) Appendix A to ASTM C423 Sound Absorption Test Non-standard calculation of equivalent NRC Rating and Absorption Coefficients from spaced absorbers. At this time ASTM C423 does not provide a standard method for determining absorption coefficients of spaced object absorbers. Tests of a set of sound absorbing objects spaced apart from each other will yield higher absorption rates than a specimen joined together as a single patch (A-Mount or E-Mount). For this reason it is unfair to provide NRC or absorption coefficient ratings for specimens that consist of a spaced set of absorbers. Despite this, the architectural industry has expressed great demand for a simple "single number" rating for these treatments. Likewise, acoustical consultants desire equivalent absorption coefficient data for use in acoustical modeling programs. The following is an attempt to appease these demands until ASTM develops a standard method for calculation. Several alternate non-standard calculation methods are provided. Riverbank Acoustical Laboratories prefers method 1. Method 1) Apparent Sound Absorption Coefficient calculated from total test surface area covered. The total sound absorption yielded by the specimen is divided by the total horizontal surface area of the test surface covered by the suspended baffles, including intermediate spaces. The baffle rigging covered 100.0 ft2 of horizontal test surface area. Apparent Noise Reduction Coefficient (NRC) rating and Sound Absorption Average (SAA) figures are calculated from this data based on the methods described in ASTM C423-09a. This may be the most accurate method for comparing baffle arrays to ceiling tile products. The apparent sound absorption coefficient data can be assigned to a single horizontal surface or plane in acoustical modeling software for approximation of baffle array performance (assuming baffle spacing is similar to that tested). Method 2) Apparent Sound Absorption Coefficient calculated from total exposed surface area of specimen. The total sound absorption yielded by the specimen is divided by the total surface area of all exposed specimen faces (8.94 ft2 per baffle x 16 baffles = 143.0 ft2 total surface area). Apparent Noise Reduction Coefficient (NRC) rating and Sound Absorption Average (SAA) figures are calculated from this data based on the methods described in ASTM C423-09a. This method shows the actual absorption occurring at the exposed surfaces, but does not provide a fair comparison with materials mounted as a uniform patch (in A-mount or E-mount). Method 3) Apparent Sound Absorption Coefficient calculated from one face per baffle. The total sound absorption yielded by the specimen is divided by the surface area of one side of one large face for each baffle in the specimen (4.0 ft2 per baffle x 16 baffles = 64 ft2 total surface area). Apparent Noise Reduction Coefficient (NRC) rating and Sound Absorption Average (SAA) figures are calculated from this data based on the methods described in ASTM C423-09a. This method is favored by some material manufacturers since it yields very high NRC figures, but does not provide a fair comparison with other ceiling tile or wall panel products.

Riverbank Acoustical Laboratories 1512 S. Batavia Ave.

Geneva, IL 60134-3302 Tel: 630-232-0104 Fax: 630-232-0138 Email: [email protected]

FOR: Audimute Soundproofing Report Referenced: RAL™-A13-341 CONDUCTED: 5 December 2013 Page 2 of 2 Appendix A: Data Note: See full test report for details of mounting position, spacing and configuration as these

parameters greatly affect sound absorption performance.

Specimen Absorption (US) Method 1 Method 2 Method 3 Apparent Apparent Apparent

Abs. Coefficient Abs. Coefficient Abs. Coefficient Freq. (Hz) Sabins Sabins/baffle From Total

Coverage Area From Total Exposed

Surface Area From One

Face/Baffle 40 19.53 1.22 0.20 0.14 0.31 50 -27.23 -1.70 -0.27 -0.19 -0.43 63 8.39 0.52 0.08 0.06 0.13 80 4.27 0.27 0.04 0.03 0.07

100 12.27 0.77 0.12 0.09 0.19 125 16.67 1.04 0.17 0.12 0.26 160 20.50 1.28 0.21 0.14 0.32 200 23.43 1.46 0.23 0.16 0.37 250 38.42 2.40 0.38 0.27 0.60 315 44.81 2.80 0.45 0.31 0.70 400 55.02 3.44 0.55 0.38 0.86 500 76.60 4.79 0.77 0.54 1.20 630 88.85 5.55 0.89 0.62 1.39 800 105.54 6.60 1.06 0.74 1.65

1,000 118.55 7.41 1.19 0.83 1.85 1,250 126.54 7.91 1.27 0.88 1.98 1,600 127.73 7.98 1.28 0.89 2.00 2,000 127.95 8.00 1.28 0.89 2.00 2,500 127.49 7.97 1.27 0.89 1.99 3,150 127.63 7.98 1.28 0.89 1.99 4,000 122.28 7.64 1.22 0.85 1.91 5,000 116.82 7.30 1.17 0.82 1.83 6,300 114.21 7.14 1.14 0.80 1.78 8,000 112.68 7.04 1.13 0.79 1.76

10,000 111.30 6.96 1.11 0.78 1.74

Apparent NRC: 0.90 0.63 1.41

Apparent SAA: 0.88 0.62 1.38

Prepared by___________________________ Eric P. Wolfram Laboratory Manager

for: audimute soundproofing sound absorption · pdf filethe results reported apply only to the...

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