LGAI
LGAI Technological Center, S.A.
Campus de la UAB
Apartado de Correos 18
E - 08193 BELLATERRA (Barcelona)
T +34 93 567 20 00
F +34 93 567 20 01
www.applus.com
9/LE766
Bellaterra:
June 5th, 2012
File number:
12/5203-878
Petitioner’s reference:
URSA IBÉRICA AISLANTES, S.A.
Paseo Recoletos, nº 3
28004 Madrid
TEST REPORT
REQUESTED TEST:
Measurement of the sound absorption in a reverberation room
in accordance with the standard UNE-EN ISO 354:2004 of a
sample of URSA Air Zero A2 mineral wool panels with 37 cm
cavity.
DATE OF TEST:
May 25th, 2012
TEST CARRIED OUT BY: Xavier Roviralta (Acoustics Laboratory - LGAI Technological Center)
Firmado
digitalmente por
Francisco Javier
Costa Guallar
Xavier Costa
Manager of Acoustics
LGAI Technological Center S.A.
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The reproduction of the present document is only allowed if done it its entirely. Only reports with an original signature or certified
copies will have legal force. This document consists of 10 pages 0 of which are Appendixes.
-page 1-
LGAI Technological Center, S.A. inscrita en el Registro Mercantil de Barcelona, Tomo 35.803, Folio 1, Hoja nº B-266.627 Inscripción 1ª CIF A-63207492
File number: 12/5203-878
Page number: 2
1.- SCOPE OF THE TEST
The scope of this test is to determinate the sound absorption in accordance with the standard
UNE-EN ISO 354:2004, of a sample of URSA Air Zero A2 25 mm thickness mineral wool panels,
installed with a cavity of 37 cm.
2.- MEASUREMENT EQUIPMENT
The equipment used in the test are the following:
•
Spectrum analyzer id. number: 103099 (Bruel&Kjaer mod. Pulse)
•
Microphone calibrator id. number: 103032 (Bruel&Kjaer mod. 4231)
•
Microphones id. numbers: 103123, 103126, 103128, 103131, 170093 and 170108
(Bruel&Kjaer mod. 4943)
•
Sound sources id. numbers: 103098 (AVM mod. DO12) and 103124 (CESVA mod.
BP012)
•
Noise generator with power amplifier id. number: 103125 (CESVA mod. AP600)
•
Equalizer id. number: 170092 (INTER mod. EQ-9231)
•
Thermo-hygrometer id. number: 103021 (Oregon Scientific mod. BA116)
•
Tape measurer id. number: 103095 (Stanley mod. Powerlock)
3.- TEST PROCEDURE
The test is carried out in accordance with LGAI Technological
F2
Center procedure C521 0198 based on the European standard
P4
UNE-EN ISO 354:2004, ‘Measurement of sound absorption in a
P3
P5
reverberation room’; reverberation times of the room with and
without sample are compared. The evaluation and rating is
P6
P2
done in accordance with the European standard UNE-EN ISO
11654:1998.
F1
P1
Around the sample 6 microphones positions (P1 to P6, in figure)
and 2 sound sources (F1 and F2) positions are defined.
Measurements are carried out exciting the room with pink noise and calculated from the
measured reverberation times as specified in part 5.3.
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4.- TEST SPECIMEN DESCRIPTION
Test specimen has the commercial reference URSA Air Zero A2 and corresponds to mineral
wool panels coated with an aluminium–glass fiber fabric on one face and with a black glass fiber
fabric on the other face.
URSA Air Zero A2 is a panel of 3000 x 1200 x 25 mm (length, width and thickness) with tongue
and groove on the sides. Tested panels are provided by the petitioner and received by the
Acoustics Laboratory on May 23rd 2012.
Images 1 and 2 URSA Air Zero A2 tested panels
Images 3 and 4 Tongue and groove on the sides
Image 5 Aluminium–glass fiber fabric on one face and black glass fiber fabric on the other
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Test specimen consists of 3 URSA Air Zero A2 panels, forming a rectangle of 3515 x 3000 mm,
which means a test area of 10,55 m². The panels are placed inside the reverberation room with
the face coated with black glass fiber fabric side up, mounted on a metal studs structure. The
cavity under the panels is 37 cm.
The perimeter edge of the test specimen is covered with an acoustically reflective frame made of
medium density wooden boards (DM), in order to prevent the edges from absorbing sound and
take into account only the upper face of test specimen.
Images 6 to 8 Installation of test specimen into the reverberation room
Image 9 Sample ready to be tested
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5.- DEFINITIONS AND CLASSIFICATION
5.1. Reverberation time. Time, in seconds, that would be required for the sound pressure
level to decrease by 60 dB after the sound source has stopped.
5.2. Equivalent sound absorption area of a room. Hypothetical area of a totally absorbing
surface without diffraction effects which, if it were the only absorbing element in the room,
would give the same reverberation time as the room under consideration.
5.3. Equivalent sound absorption area of the test specimen, AT. Difference between the
equivalent sound absorption area of the reverberation room with and without the test specimen.
To calculate this parameter the average reverberation time in the reverberation room is
measured with and without the test specimen. From these reverberation times the equivalent
sound absorption area, AT, shall be calculated using the Sabine formula:

1
1
−
c
T
c
1T 1
 2 2
AT = A2 − A1 = 55.3 V 

 - 4 V (m 2 - m 1 )

where:
•
c1 and c2 are the propagation speed of sound in air temperatures t1 and t2,
•
V is the volume, in cubic metres, of the empty reverberation room,
•
T1 is the reverberation time, in seconds, of the empty reverberation room,
•
T2 is the reverberation time, in seconds, of the empty reverberation room after the test
specimen has been introduced,
•
m1 and m2 are the power attenuation coefficients, in reciprocal metres, of the empty
reverberation room and with the test specimen, respectively. The value of m is
calculated according to the International Standard ISO 9613-1 using the climatic
conditions that have been present during the measurement.
The value of m can be calculated from the attenuation coefficient, α, which is used in
International Standard ISO 9613-1 in accordance with the formula:
m =
α
10 log (e)
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5.4. Sound Absorption Coefficient. The sound absorption coefficient, αs, of a plane absorber
(or an array of identical objects), shall be calculated using the formula:
αS =
AT
S
where:
•
AT is the equivalent sound absorption area of the test specimen, in square meters,
•
S is the area, in square meters, of the test specimen.
For discrete absorbers, the result should be expressed as equivalent sound absorption area per
object, which is determined by dividing AT by the number of objects tested, n:
Aobj =
AT
n
For a specified array of objects, the result should be given as equivalent sound absorption area
of the whole configuration.
5.5. Practical sound absorption coefficient, αp. Value of sound absorption coefficient
depending of frequency, based upon measurements of sound absorption according standard ISO
354, and calculated using the formula:
α pi =
αi 1 + αi 2 + αi 3
3
where:
•
αpi is the practical sound absorption coefficient for the ith octave band,
•
αi1, αi2 and αi3, are the sound absorption coefficients of the corresponding third-octave
band within the ith octave band.
Values are given with 2 decimal and rounded in steps of 0,05 until a maximum value of αpi =
1,00 in case of rounded average values > 1,00.
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5.6. Weighted sound absorption coefficient, αW. Single-number defined as the value of
the reference curve, at the frequency of 500 Hz, after shifting it according to the method laid
down.
To evaluate the results of a measurement, the reference curve is shifted in steps of 0,05 towards
the curve of practical sound absorption, αp, until the sum of the unfavourable deviations is as
large as possible but no more than 0,10. An unfavourable deviation at a particular frequency
occurs when the result of measurement is less than the reference curve.
The set of reference values used for comparison with measurement results (reference curve) is
specified in table below:
1.2
Reference curve
value
250
0.80
500
1.00
1000
1.00
2000
1.00
4000
0.90
1
Curva de referencia
Frequency (Hz)
0.8
0.6
0.4
0.2
0
125
250
500
1000
2000
4000
Frecuencia,Hz
Hz
Frequency,
5.7. Shape indicators, L. M. H. If a practical sound absorption coefficient, αpi, exceeds the
shifted reference curve value on 0,25 or more, a shape indicator will be added.
When excess happens at 250 Hz, indicator L is used. For 500 and 1000 Hz octave bands,
indicator M is used. For 2000 Hz and 4000 Hz octave bands, indicator H is used.
5.8. Sound Absorption Classes. Sound Absorption classes A to E are another classification
method described in the International Standard ISO 11654 and it is used in wide band
applications. The single-number, αW, is compared with values given in the table below:
File number: 12/5203-878
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αW
Sound absorption class
A
0.90; 0.95; 1.00
B
0.80; 0.85
C
0.60; 0.65; 0.70; 0.75
D
0.30; 0.35; 0.40; 0.45; 0.50; 0.55
E
0.15; 0.20; 0.25
Not classified
0.00; 0.05; 0.10
6.- TEST CONDITIONS
Reverberation room characteristics
Shape:
Dimensions:
Volume (V):
Parallelepiped
238,2 m2
Total area (AT):
7,84 × 4,96 × 6,27 m
Number of diffusers:
3
14
1,5 m2
Size of diffuser:
243,6 m
Environmental conditions of reverberation room
Room state:
Temperature:
Relative humidity:
Air pressure:
Empty
With test specimen
22,3
ºC
22,2
ºC
49
%
49
%
1002
hPa
1002
hPa
7.- UNCERTAINTY OF RESULTS
The uncertainty associated to the test has been calculated and it is available to the petitioner.
File number: 12/5203-878
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8.- REVERBERATION TIMES AND EQUIVALENT SOUND ABSORPTION AREA
In following tables the reverberation time values of the test room with and without the test
specimen are given, as well as the calculated equivalent sound absorption areas.
Frequency
(Hz)
Reverberation time
of the empty room,
T1 (s)
Reverberation time
of the room with the
test specimen, T2 (s)
Equivalent sound
absorption area, AT
(m²)
100
14,41
6,21
3,58
125
11,97
5,36
4,03
160
10,60
4,82
4,42
200
11,93
4,83
4,82
250
12,56
4,60
5,39
315
11,35
3,93
6,51
400
10,57
3,45
7,64
500
10,30
3,46
7,52
630
9,47
3,27
7,85
800
8,88
2,93
8,95
1000
8,45
2,64
10,17
1250
7,51
2,50
10,46
1600
6,54
2,31
10,94
2000
5,72
2,15
11,40
2500
4,92
2,01
11,48
3150
4,18
1,88
11,47
4000
3,22
1,68
11,12
5000
2,51
1,48
10,83
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9.- RESULTS
Sound absorption in accordance with UNE-EN ISO 354:2004
URSA IBÉRICA AISLANTES, S.A.
Sound abs. coefficient, αS
Test specimen:
URSA Air Zero A2, 25 mm mineral
wool panels coated with an aluminium–
glass fiber fabric on one face and with a
black glass fiber fabric on the other face.
Tested with 37 cm cavity
Sound absorption coefficient, αS
1,2
1,1
1
0,9
0,8
0,7
0,6
0,5
0,4
0,3
4000
3150
2500
2000
1600
1250
800
1000
630
500
400
315
250
200
160
125
5000
Hz
0,2
100
9/LE766
Freq. (Hz)
αs
100
0,34
125
0,38
160
0,42
200
0,46
250
0,51
315
0,62
400
0,72
500
0,71
630
0,74
800
0,85
1000
0,96
1250
0,99
1600
1,04
2000
1,08
2500
1,09
3150
1,09
4000
1,05
5000
1,03
Practical sound absorption coefficient, αp
1,2
Practical sound
absorption coef., αp
1,1
1
0,9
Freq. (Hz)
αp
0,8
125
0,7
250
0,6
500
0,40
0,55
0,75
0,5
1000
0,4
2000
Sound abs. coef.
Ref. shifted.
0,3
4000
0,95
1,00
1,00
Hz
0,2
125
250
500
1000
2000
4000
Weighted sound absorption coefficient, αW = 0,80 (H)
Sound absorption class: B
It is highly recommended to use the single number "weighted sound absorption coefficient (αw)" together with
frequency-dependent values of sound absorption coefficient.
The results reported in this document relate only to the sample, product or item delivered to LGAI Technological Center the
appointed day having been tested under the conditions established in this document.