An1512 S BATAVIA AVENUEGENEVA, IL 60134

A L I O N Technical Center

Test Report630-232-0104

SPONSOR: Auralex Acoustics
Indianapolis, IN
CONDUCTED: 2019-10-21

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINESound Absorption
RAL™-A19-427
Page 1 of 8

ON: 2 in. Studiofoam Wedges
TEST METHODOLOGYRiverbank Acoustical Laboratories™ is accredited by the U.S. Department of Commerce, National
Institute of Standards and Technology (NIST) under the National Voluntary Laboratory Accreditation
Program (NVLAP) as an ISO 17025:2017 Laboratory (NVLAP Lab Code: 100227-0) and for this test
procedure. The test reported in this document conformed explicitly with ASTM C423-17: "StandardTest Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation RoomMethod." The specimen mounting was performed according to ASTM E795-16: "Standard Practices for
Mounting Test Specimens During Sound Absorption Tests." A description of the measurement
procedure and room specifications are available upon request. The results presented in this report apply
to the sample as received from the test sponsor.
INFORMATION PROVIDED BY SPONSOR
The test specimen was designated by the sponsor as 2 in. Studiofoam Wedges. The following nominal
product information was provided by the sponsor prior to testing. The accuracy of such sponsor-provided
information can affect the validity of the test results.
Product Under Test
Trade Name: Studiofoam
Material: Open cell polyurethane foam
Thickness: Average @ 31.75 mm (1.25 in.)
Overall @ 50.8 mm (2 in.)Density: 32.0 kg/m3 (2.0 lbs/ft3)
Manufacturer: Auralex Acoustics
SPECIMEN MEASUREMENTS & TEST CONDITIONS
Through a full external visual inspection performed on the test specimen, Riverbank personnel verifiedthe following information:
Test Specimen
Material: Flexible, compressible foam panels
Dimensions: 16 @ 606.42 mm (23.875 in.) x 603.25 mm (23.75 in.)4 @ 606.42 mm (23.875 in.) x 301.62 mm (11.875 in.)Thickness: Sawtooth profile, pitch @ 40 mm (1.575 in.)Maximum @ 50.5 mm (1.988 in.)
Minimum @ 13 mm (0.512 in.)
Overall Weight: 6.12 kg (13.5 lbs)
Installation: Sawtooth profile exposed to sound field, parallel between panels
RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES INACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIMPRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THESPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

An1512 S BATAVIA AVENUEGENEVA, IL 60134

A L I O N Technical Center

RIVERBANK.ALIONSCIENCE.COM

Test Report630-232-0104

Auralex Acoustics
2019-10-21

FOUNDED 1918 BY
WALLACE CLEMENT SABINERAL™-A19-427
Page 2 of 8

Overall Specimen Properties
Size: 2.43 m (95.5 in) wide by 2.71 m (106.875 in) longThickness: 0.05 m (1.962 in)Weight: 6.12 kg (13.5 lbs)
Mass per Unit Area: 0.93 kg/m² (0.19 lbs/ft²)
Calculation Area: 6.585 m² (70.88 ft²)
Test Environment
Room Volume:
Temperature:
Relative Humidity:
Barometric Pressure:291.98 m³
21.8 °C ± 0.1 °C (Requirement: ≥ 10 °C and ≤ 5 °C change)
55.1 % ± 1.0 % (Requirement: ≥ 40 % and ≤ 5 % change)
96.8 kPa (Requirement not defined)

MOUNTING METHOD
Type A Mounting: The test specimen was laid directly against the test surface. Per sponsor request, theperimeter edges were exposed, as would be typical of an actual installation of the product under test.

RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIMPRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THE
SPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

1512 S BATAVIA AVENUEGENEVA, IL 60134AnA L I O N Technical CenterTest Report630-232-0104

Auralex Acoustics
2019-10-21

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINERAL™-A19-427
Page 3 of 8Figure 1 – Specimen mounted in test chamber

Figure 2 – Detail of specimen material
RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIM
PRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THE
SPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

An1512 S BATAVIA AVENUEGENEVA, IL 60134

A L I O N Technical Center

Test Report630-232-0104

Auralex Acoustics
2019-10-21

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINERAL™-A19-427
Page 4 of 8

TEST RESULTSSpecimen total absorption and absorption coefficient are tabulated at the eighteen standard frequencies.
A graphic presentation of the data and additional information appear on the following pages.
1/3 Octave Center
Frequency(Hz)

Total Absorption(m2)

Total Absorption(Sabins)

Absorption
Coefficient100** 125
160

1.44
1.40
1.33

15.49
15.10
14.27

0.22
0.21
0.20

200
** 250
315

1.64
1.58
2.50

17.62
17.03
26.86

0.25
0.24
0.38

400
** 500
630

2.97
4.12
4.95

31.93
44.31
53.33

0.45
0.63
0.75

800
** 1000
1250

5.70
6.37
6.81

61.35
68.58
73.25

0.87
0.97
1.03

1600** 2000
2500

7.12
7.26
7.27

76.61
78.10
78.21

1.08
1.10
1.103150** 4000
5000

7.227.18
7.57

77.74
77.23
81.45

1.10
1.09
1.15

SAA = 0.74
NRC = 0.75

RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIM
PRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THE
SPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

An1512 S BATAVIA AVENUEGENEVA, IL 60134

A L I O N Technical Center

Test Report630-232-0104

Auralex Acoustics
2019-10-21

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINERAL™-A19-427
Page 5 of 8TEST RESULTS (continued)
The sound absorption average (SAA) is defined in ASTM C423-17 Section 3.1.1 as the arithmetic
average of the sound absorption coefficients of a material for the twelve one-third octave bands from200 Hz through 2500 Hz, inclusive, rounded to the nearest integer multiple of 0.01.
The noise reduction coefficient (NRC) is defined from previous versions of ASTM C423 as thearithmetic average of the sound absorption coefficients at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz,
rounded to the nearest integer multiple of 0.05.

Tested by_____________________________

Report by__________________________

Marc Sciaky
Senior Experimentalist

Malcolm Kelly
Acoustical Test Engineer

Approved by___________________________
Eric P. Wolfram
Laboratory Manager

Digitally signed by Eric P
Wolfram
Location: Geneva, IL
Date: 2019.11.07
12:40:16 -06'00'

RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIM
PRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THE
SPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

1512 S BATAVIA AVENUEGENEVA, IL 60134
630-232-0104

AnA L I O N Technical Center

Test Report

Auralex Acoustics
2019-10-21

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINERAL™-A19-427
Page 6 of 8

SOUND ABSORPTION REPORT2 in. Studiofoam Wedges

SAA = 0.74
NRC = 0.75

RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIMPRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THE
SPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

An1512 S BATAVIA AVENUEGENEVA, IL 60134

A L I O N Technical Center

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINE

Test Report630-232-0104

Auralex Acoustics
2019-10-21

RAL™-A19-427
Page 7 of 8

APPENDIX A: Extended Frequency Range Data
Specimen: 2 in. Studiofoam Wedges (See Full Report)
The following non-accredited data were obtained in accordance with ASTM C423-17, but extend beyond
the defined frequency range of 100Hz to 5,000Hz. These unofficial results are representative of the RAL
test environment only and intended for research & comparison purposes.
1/3 Octave Band
Center Frequency(Hz)

Total Absorption(Sabins)

Absorption
Coefficient

31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
12500

1.01
-3.52
3.30
7.35
6.17
15.49
15.10
14.27
17.62
17.03
26.86
31.93
44.31
53.33
61.35
68.58
73.25
76.61
78.10
78.21
77.74
77.2381.45
82.86
87.18
87.52
90.59

0.01
-0.05
0.05
0.10
0.09
0.22
0.21
0.20
0.25
0.24
0.38
0.45
0.630.75
0.87
0.97
1.03
1.08
1.10
1.10
1.10
1.09
1.15
1.17
1.23
1.23
1.28

RIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIM
PRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THE
SPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.

An

1512 S BATAVIA AVENUEGENEVA, IL 60134

A L I O N Technical Center

RIVERBANK.ALIONSCIENCE.COM
FOUNDED 1918 BY
WALLACE CLEMENT SABINE

Test Report630-232-0104

Auralex Acoustics
2019-10-21

RAL™-A19-427
Page 8 of 8

APPENDIX B: Instruments of Traceability
Specimen: 2 in. Studiofoam Wedges (See Full Report)
Description

Model

System 1

Type 3160-A-042

Bruel & Kjaer Mic And PreampA
Bruel & Kjaer Pistonphone
Omega Digital Temp., Humid.
And Pressure Recorder

SerialNumber3160106968

Date ofCertification

CalibrationDue

2019-06-25

2020-06-25

Type 4943-B-001

2311428

2019-09-27

2020-09-27

Type 4228
OM-CPPRHTemp2000

2781248

2019-08-09

2020-08-09

P978442019-02-08

2020-02-08

APPENDIX C: Revisions to Original Test Report
Specimen: 2 in. Studiofoam Wedges (See Full Report)
Date
2019-10-24

Revision
Original report issued

2019-11-07Proprietary foam information removed per customer request. Designation
changed from “Panels” to “Wedges.” -EPWENDRIVERBANK ACOUSTICAL LABORATORIES IS ACCREDITED BY NVLAP (LAB CODE 100227-0) FOR ACOUSTICAL TESTING SERVICES IN
ACCORDANCE WITH ISO/IEC 17025:2017 AND FOR THIS PROCEDURE. THIS REPORT MUST NOT BE USED BY THE CLIENT TO CLAIM
PRODUCT CERTIFICATION, APPROVAL, OR ENDORSEMENT BY RAL, NVLAP, NIST, OR ANY AGENCY OF THE U.S. GOVERNMENT.
THIS REPORT SHALL NOT BE MODIFIED WITHOUT THE WRITTEN APPROVAL OF RAL. THE RESULTS REPORTED APPLY ONLY TO THESPECIFIC SAMPLE SUBMITTED FOR TESTING; RAL ASSUMES NO RESPONSIBILITY FOR THE PERFORMANCE OF ANY OTHER SAMPLE.