This standard specifies the classification and testing methods for airborne sound insulation performance of building exterior windows. This standard applies to the classification and testing of airborne sound insulation performance of building exterior windows made of any material. It is also applicable to other windows with sound insulation requirements. GB/T 8485-2002 Classification and testing methods for airborne sound insulation performance of building exterior windows GB/T8485-2002 Standard download decompression password: www.bzxz.net

ICS91.060.50
National Standard of the People's Republic of China
GB/T 8485—2002
Grading and test method for airborne sound insulating properties of windows Issued on April 28, 2002
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on December 1, 2002
GB/T8485—2002
This standard is a revision of GB/T8485—1987 "Grading and test method for airborne sound insulating properties of windows". The main difference between this standard and GB/T8485-1987 is that the order of sound insulation performance grading is opposite. In the 87 version, "Grade 1" is the highest sound insulation level, while in the new version, "Grade 1" is the lowest sound insulation level. This standard uses the "Classification Table of Airborne Sound Insulation Performance of Building External Windows" of the original standard as a reminder appendix of this standard.
This standard 5.2.1.5.2.2 is revised with reference to the relevant provisions of the latest versions of the international standards ISO140-1 (1997) "Sound insulation measurement of acoustic buildings and building components Part 1: Requirements for suppression of lateral sound transmission by laboratory test equipment" and ISO140-3 (1995) "Sound insulation measurement of acoustic buildings and building components Part 3: Laboratory measurement of airborne sound insulation of building components". Appendix A of this standard is a reminder appendix.
This standard replaces GB/T8485-1987 from the date of implementation. This standard was proposed by the Ministry of Construction.
This standard is under the jurisdiction of the Technical Committee on Standardization of Building Products and Components of the Ministry of Construction. The responsible drafting unit of this standard is China Academy of Building Research. The participating drafting unit of this standard is Shanghai Academy of Building Research. The main drafters of this standard are Ding Guoqiang, Tan Hua and Liu Mingming. This standard was first issued in December 1987. This standard is entrusted to the Institute of Building Physics of China Academy of Building Research for interpretation. 1 Scope
National Standard of the People's Republic of China
Grading and test method for airborne sound insulating properties of windows
The graduation and test method for airborne sound insulating properties of windows This standard specifies the graduation and test method for airborne sound insulating properties of windows. GB/T8485—2002
Replaces GB/T8485-—1987
This standard applies to the graduation and test of airborne sound insulating properties of windows made of any material. It is also applicable to other windows with sound insulation requirements.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GBJ47—1983 Specification for measurement of sound absorption coefficient using reverberation chamber method GBJ121—1988 Standard for evaluation of building sound insulation GB/T3241-1998 Octave and fractional octave filters (eqvIEC1260:1995) GB/T3769—1983
Scale and size for drawing frequency characteristic diagrams and polar coordinate diagrams (negIEC263:1975) GB/T3785-1983 Electrical and acoustic properties and test methods of sound level meters GB/T3947-1996 Acoustic terminology
3 Definitions
In addition to the definitions in GB/T3947, this standard also adopts the following definitions. 3.1 Weighted sound reduction index The single value evaluation quantity obtained by comparing the measured frequency characteristic curve of the air sound insulation of the component with the air sound insulation reference curve specified in GBJ121 according to the prescribed method is expressed as Rw, the unit is dB, and the integer is taken. 3.2 Diffuser
An object that can diffuse sound in the building space. The passband is made into a scattering object with a size equivalent to the wavelength of the sound wave and hung in the air, or made into an undulating surface on the wall or ceiling.
4 Grading
4.1 Grading index
Take the single value evaluation quantity of the air sound insulation performance of the window-4.2 Grading index value
Grading index value is shown in Table 1.
-The weighted sound insulation Rw is used as the grading index value. 1
Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on April 28, 2002, and implemented on December 1, 2002
5 Test
GB/T8485-2002
Table 1 Grading of airborne sound insulation performance of building exterior windowsGrading index value
30R<35
35ARwA40
40八Rw45
5.1 Test items
The sound insulation of the test piece in 1/3 octave at the following center frequencies: 100.125.160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2.000, 2500, 3150 (Hz). 5.2 Testing device
The testing device consists of two parts: laboratory and test instrument, as shown in Figure 1. Mixer (reverberation)
Speaker
Transmitter
Power amplifier
Speaker
Test piece
Microphone
Mixer II (receiving)
Figure 1 Schematic diagram of the testing device
Band analyzer
Head or recording instrument
5.2.1 Laboratory
The laboratory consists of two reverberation chambers. There is an opening in the middle of the common wall of the two chambers for installing the window specimen. The size of the opening should be 2cm to 3cm larger than the specimen size in the width direction; and 1cm to 1.5cm larger than the specimen size in the height direction. The bottom of the opening is about 90cm from the ground. Public walls should be built with bricks, or they can be assembled with other sound insulation components. The laboratory should meet the following conditions: 5.2.1.1 The volume of each reverberation room should not be less than 50m, the volume and shape of the two rooms should not be exactly the same, and the volume difference should not be less than 10%.
5.2.1.2 The proportion of the size of each reverberation room should be reasonably selected (such as the length, width and height of the rectangular reverberation room to form a harmonic series), and no two of the dimensions should be equal, nor should they be in an integer ratio. 5.2.1.3 When the sound field is uneven, a diffuser should be installed in the room. 5.2.1.4 The background noise in the receiving room should be low enough, and the low-frequency reverberation time should be controlled within the range of 1~2(V/50)3/3s. V is the volume of the receiving room (m*).
GB/T8485—2002
5.2.1.5 Any indirect sound transmission between two rooms (including the common wall) can be ignored compared with the direct sound transmission through the test piece. It can be confirmed by the following method: pre-measure the apparent sound insulation R' when there is no window opening on the common wall. During the test, if the apparent sound insulation R of the test piece is less than R10dB or more, it can be considered that the indirect sound transmission is negligible compared with the direct sound transmission through the test piece. 5.2.1.6 Effective vibration isolation measures should be taken in the structure between the two rooms. 5.2.2 Instruments and Equipment
5.2.2.1 Sound source system: It consists of a white noise generator or a pink noise generator, a 1/3 octave filter, a power amplifier and a sounder. It should meet the following conditions:
a) The sound source system should be able to emit stable sound waves and have a continuous spectrum within the test frequency range; b) The characteristics of the filter should comply with the provisions of GB/T3241; c) The sound source should have sufficient sound power so that the sound pressure level of any frequency band in the receiving room is at least 10dB higher than the background noise level; d) If the sound source has two or more speakers working at the same time, these speakers should be installed in the same box, the maximum size of the box should not exceed 0.7m, and each speaker should be driven in phase; e) The speaker is placed on the corner opposite to the test piece, but should not point to the test piece. 5.2.2.2 Receiving equipment: It consists of a microphone, an amplifier, a 1/3 octave analyzer and a printing and recording instrument. They should meet the following requirements:
a) The diffuse field frequency response of the microphone should be flat and non-directional as much as possible b) The filter characteristics should be the same as those in b) of 5.2.2.1; c) The instrument used to measure the sound pressure level should comply with the relevant provisions of Type 2 or above in GB/T3785. 5.3 Test piece
5.3.1 Number of test pieces and selection method
Three orange sample windows of the same window type are selected. For random inspection, the test pieces are selected by random sampling. 5.3.2 Requirements for test pieces
The test pieces must be completely consistent with the product design and assembly drawings. No extra parts or accessories can be added, or special assembly processes and improvement measures can be used.
5.3.3 Inspection of relevant parameters of test pieces
The weight, total area, opening area and glass thickness of the test pieces should be inspected in advance before installation. 5.3.4 Installation of test pieces
5.3.4.1 The test pieces can be installed by one of the following methods: a) When the opening for installing the test piece is composed of a brick wall or a concrete wall, the test piece can be built in the opening with white lime (or cement) mortar. The gap between the window frame and the wall is filled with mortar, and the wall surface in the opening is coated with 2.5cm thick mortar (covering the window frame by about 1cm). The test can be started only after the mortar is cured. The gap between the window frame and the wall can also be filled with sound-absorbing materials (such as mineral wool), and then sealed with elastic sealants on both sides: b) When the opening of the test piece is assembled by other sound insulation components, the sound insulation capacity of the sound insulation components used and the sealing measures of the assembled gaps should be verified in advance to meet the inspection requirements; c) The thickness of the wall of the opening of the test piece should not exceed 500mm. 5.3.4.2 The thickness of the wall box formed on both sides of the test piece should not be the same, and the ratio should be approximately 2:1. 5.3.4.3 The test piece shall not be deformed due to installation. 5.4 Testing
5.4.1 The sound insulation R (dB) of the window is calculated according to formula (1): R = Lt -Lp2 +10lgS/A
Where: 1m - average sound pressure level in the sound source room, dB; - average sound pressure level in the receiving room, dB;
S - area of ​​the window, m;
(1)
A - sound absorption of the receiving room, m.
The sound absorption A (m) of the receiving room is determined by formula (2): Where: V - volume of the receiving room, m3;
T6o - reverberation time of the receiving room, s. GB/T8485-2002
A=0.163V/T
The reverberation time T6o is measured in accordance with the relevant provisions of GBJ47. 5.4.2 Test procedure
5.4.2.1 Before starting the test, open and close all the openable and closable parts of the test piece 10 times. If the seal is damaged or falls off during this process, no remedial measures shall be taken. Then close the window using the window closing device. 5.4.2.2 Before the test, the test instrument should be calibrated and records should be made. 5.4.2.3 Test the sound insulation according to the center frequency specified in 5.1. 5.4.2.4 Test steps
1) Use the sound source system to generate the steady-state sound field of the above frequencies in the sound source room in turn, and measure the average sound pressure levels Lp and Lpz in the sound source room and the receiving room respectively. The average sound pressure level can be obtained by one of the following methods: a) Use a moving single microphone or multiple fixed position microphones to obtain the average sound pressure level L and Lp2. For the center frequency higher than 500Hz, 3 positions can be taken, and 6 positions for other frequencies. At each position, the distance between the microphone and the room interface and diffuser should be greater than 1m. At each position, the sound pressure level value is read with an average time of 5 seconds for each center frequency. When the sound pressure level variation range between different points in the sound field of the room is not greater than 6dB, the arithmetic mean value measured at each position can be directly used as the average sound pressure level. If the sound pressure level variation range between different points in the sound field of the room is greater than 6dB, the average sound pressure level L (dB) should be calculated according to formula (3): Lp = 10lg
Where: L is the sound pressure level at the i-th point in the room; n is the number of indoor measurement points.
(3)
b) Use a microphone that can move continuously at high speed and an instrument with P2 integration to obtain the average sound pressure level. The time for the microphone to rotate one circle should be greater than 30s.
2) Measure the reverberation time T66. It is advisable to take 3 microphone positions. Perform at least 2 reverberation time analyses for each position. 5.4.2.5 Calculate the sound insulation of each 1/3 octave band according to formula (1) and formula (2), and then calculate the weighted sound insulation Rw according to GBJ121. 6 Test report
6.1 The airborne sound insulation performance of each window sample shall be given in the form of a table and a frequency characteristic curve. The curve shall be drawn on a coordinate paper with the ordinate representing the sound insulation and the abscissa (logarithmic scale) representing the frequency. The length of the frequency ratio 10:1 should be equal to 25dB of the ordinate. The abscissa and ordinate may also use other ratios, but shall comply with the requirements of GB/T3769. 6.2 The arithmetic mean of the airborne sound weighted sound insulation Rw values ​​of the three-orange sample windows shall be the grading index value of this window type. If the mean value contains decimals, round it off to an integer. Then determine the performance level of the group of windows by referring to Table 1 and mark it in the conclusion of the test report. When the sample windows are less than three orange, the test results shall not be used as the grading index value of the window type. 6.3 The inspection report shall also include the following contents: 6.3.1 The manufacturer name, variety, model, specifications and dimensions of the test piece and related diagrams (the elevation and section of the whole window, the section of the profile and the section of the inlay strip, the section of the sealing strip, etc.).
6.3.2 The thickness, type and inlay method of the glass, the surface density and the openable area of ​​the window. 6.3.3 Whether there are sealing measures. If so, the material, section and installation method of the sealing strip shall be marked. 6.3.4 The model of the inspection instrument.
6.3.5 The name of the inspection unit, the inspection date and the seal. 6.3.6 The signatures of the inspector and the auditor. GB/T8485—2002
Appendix A
(Suggestive Appendix)bzxZ.net
Grading table in GB8485—87 “Grading of airborne sound insulation performance of exterior windows of buildings and its test methods”Grading table in GB8485—87 “Grading of airborne sound insulation performance of exterior windows of buildings and its test methods” (see Table A1). Table A1
Range of weighted sound insulation Rw value (dB)
Rw≥45
45>Rw≥40
40>Rw≥35
35>Rw≥30
30>Rw≥25
25>Rw≥20
GB/T8485-2002
People's Republic of China
National Standard
Airborne sound insulation performance of building exterior windows
Classification and test methods
GB/T8485—2002
Published by China Standards Press
Sanlihebei Street outside Fuxingmen, Beijing No. 16
Postal code: 100045
Tel: 6852391668517548
Printed by China Standard Press Qinhuangdao Printing Factory Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Format 880×12301/16
Word count 12,000 words
Printing sheet 3/4
First edition in August 2002 First printing in August 2002 Print run 1-3000
Website bzcbs.com
Subject 613-331
Copyright exclusive Infringements must be investigated
Report telephone: (010) 685335331 The sound insulation R (dB) of the window is calculated according to formula (1): R = Lt -Lp2 +10lgS/A
Where: 1m - average sound pressure level in the sound source room, dB; - average sound pressure level in the receiving room, dB;
S - area of ​​the window, m;
(1)
A - sound absorption of the receiving room, m.
The sound absorption A (m) of the receiving room is determined by formula (2): Where: V - volume of the receiving room, m3;
T6o - reverberation time of the receiving room, s. GB/T8485-2002
A=0.163V/T
The reverberation time T6o is measured according to the relevant provisions of GBJ47. 5.4.2 Test procedure
5.4.2.1 Before starting the test, open and close all the openable and closable parts of the test piece 10 times. If the seal is damaged or falls off during this process, no remedial measures shall be taken. Then close the window using the window closing device. 5.4.2.2 Before the test, the test instrument should be calibrated and records should be made. 5.4.2.3 Test the sound insulation according to the center frequency specified in 5.1. 5.4.2.4 Test steps
1) Use the sound source system to generate the steady-state sound field of the above frequencies in the sound source room in turn, and measure the average sound pressure levels Lp and Lpz in the sound source room and the receiving room respectively. The average sound pressure level can be obtained by one of the following methods: a) Use a moving single microphone or multiple fixed position microphones to obtain the average sound pressure level L and Lp2. For the center frequency higher than 500Hz, 3 positions can be taken, and 6 positions for other frequencies. At each position, the distance between the microphone and the room interface and diffuser should be greater than 1m. At each position, the sound pressure level value is read with an average time of 5 seconds for each center frequency. When the sound pressure level variation range between different points in the sound field of the room is not greater than 6dB, the arithmetic mean value measured at each position can be directly used as the average sound pressure level. If the sound pressure level variation range between different points in the sound field of the room is greater than 6dB, the average sound pressure level L (dB) should be calculated according to formula (3): Lp = 10lg
Where: L is the sound pressure level at the i-th point in the room; n is the number of indoor measurement points.
(3)
b) Use a microphone that can move continuously at high speed and an instrument with P2 integration to obtain the average sound pressure level. The time for the microphone to rotate one circle should be greater than 30s.
2) Measure the reverberation time T66. It is advisable to take 3 microphone positions. Perform at least 2 reverberation time analyses for each position. 5.4.2.5 Calculate the sound insulation of each 1/3 octave band according to formula (1) and formula (2), and then calculate the weighted sound insulation Rw according to GBJ121. 6 Test report
6.1 The airborne sound insulation performance of each window sample shall be given in the form of a table and a frequency characteristic curve. The curve shall be drawn on a coordinate paper with the ordinate representing the sound insulation and the abscissa (logarithmic scale) representing the frequency. The length of the frequency ratio 10:1 should be equal to 25dB of the ordinate. The abscissa and ordinate may also use other ratios, but shall comply with the requirements of GB/T3769. 6.2 The arithmetic mean of the airborne sound weighted sound insulation Rw values ​​of the three-orange sample windows shall be the grading index value of this window type. If the mean value contains decimals, round it off to an integer. Then determine the performance level of the group of windows by referring to Table 1 and mark it in the conclusion of the test report. When the sample windows are less than three orange, the test results shall not be used as the grading index value of the window type. 6.3 The inspection report shall also include the following contents: 6.3.1 The manufacturer name, variety, model, specifications and dimensions of the test piece and related diagrams (the elevation and section of the whole window, the section of the profile and the section of the inlay strip, the section of the sealing strip, etc.).
6.3.2 The thickness, type and inlay method of the glass, the surface density and the openable area of ​​the window. 6.3.3 Whether there are sealing measures. If so, the material, section and installation method of the sealing strip shall be marked. 6.3.4 The model of the inspection instrument.
6.3.5 The name of the inspection unit, the inspection date and the seal. 6.3.6 The signatures of the inspector and the auditor. GB/T8485—2002
Appendix A
(Suggestive Appendix)
Grading table in GB8485—87 “Grading of airborne sound insulation performance of exterior windows of buildings and its test methods”Grading table in GB8485—87 “Grading of airborne sound insulation performance of exterior windows of buildings and its test methods” (see Table A1). Table A1
Range of weighted sound insulation Rw value (dB)
Rw≥45
45>Rw≥40
40>Rw≥35
35>Rw≥30
30>Rw≥25
25>Rw≥20
GB/T8485-2002
People's Republic of China
National Standard
Airborne sound insulation performance of building exterior windows
Classification and test methods
GB/T8485—2002
Published by China Standards Press
Sanlihebei Street outside Fuxingmen, Beijing No. 16
Postal code: 100045
Tel: 6852391668517548
Printed by China Standard Press Qinhuangdao Printing Factory Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Format 880×12301/16
Word count 12,000 words
Printing sheet 3/4
First edition in August 2002 First printing in August 2002 Print run 1-3000
Website bzcbs.com
Subject 613-331
Copyright exclusive Infringements must be investigated
Report telephone: (010) 685335331 The sound insulation R (dB) of the window is calculated according to formula (1): R = Lt -Lp2 +10lgS/A
Where: 1m - average sound pressure level in the sound source room, dB; - average sound pressure level in the receiving room, dB;
S - area of ​​the window, m;
(1)
A - sound absorption of the receiving room, m.
The sound absorption A (m) of the receiving room is determined by formula (2): Where: V - volume of the receiving room, m3;
T6o - reverberation time of the receiving room, s. GB/T8485-2002
A=0.163V/T
The reverberation time T6o is measured according to the relevant provisions of GBJ47. 5.4.2 Test procedure
5.4.2.1 Before starting the test, open and close all the openable and closable parts of the test piece 10 times. If the seal is damaged or falls off during this process, no remedial measures shall be taken. Then close the window using the window closing device. 5.4.2.2 Before the test, the test instrument should be calibrated and records should be made. 5.4.2.3 Test the sound insulation according to the center frequency specified in 5.1. 5.4.2.4 Test steps
1) Use the sound source system to generate the steady-state sound field of the above frequencies in the sound source room in turn, and measure the average sound pressure levels Lp and Lpz in the sound source room and the receiving room respectively. The average sound pressure level can be obtained by one of the following methods: a) Use a moving single microphone or multiple fixed position microphones to obtain the average sound pressure level L and Lp2. For the center frequency higher than 500Hz, 3 positions can be taken, and 6 positions for other frequencies. At each position, the distance between the microphone and the room interface and diffuser should be greater than 1m. At each position, the sound pressure level value is read with an average time of 5 seconds for each center frequency. When the sound pressure level variation range between different points in the sound field of the room is not greater than 6dB, the arithmetic mean value measured at each position can be directly used as the average sound pressure level. If the sound pressure level variation range between different points in the sound field of the room is greater than 6dB, the average sound pressure level L (dB) should be calculated according to formula (3): Lp = 10lg
Where: L is the sound pressure level at the i-th point in the room; n is the number of indoor measurement points.
(3)
b) Use a microphone that can move continuously at high speed and an instrument with P2 integration to obtain the average sound pressure level. The time for the microphone to rotate one circle should be greater than 30s.
2) Measure the reverberation time T66. It is advisable to take 3 microphone positions. Perform at least 2 reverberation time analyses for each position. 5.4.2.5 Calculate the sound insulation of each 1/3 octave band according to formula (1) and formula (2), and then calculate the weighted sound insulation Rw according to GBJ121. 6 Test report
6.1 The airborne sound insulation performance of each window sample shall be given in the form of a table and a frequency characteristic curve. The curve shall be drawn on a coordinate paper with the ordinate representing the sound insulation and the abscissa (logarithmic scale) representing the frequency. The length of the frequency ratio 10:1 should be equal to 25dB of the ordinate. The abscissa and ordinate may also use other ratios, but shall comply with the requirements of GB/T3769. 6.2 The arithmetic mean of the airborne sound weighted sound insulation Rw values ​​of the three-orange sample windows shall be the grading index value of this window type. If the mean value contains decimals, round it off to an integer. Then determine the performance level of the group of windows by referring to Table 1 and mark it in the conclusion of the test report. When the sample windows are less than three orange, the test results shall not be used as the grading index value of the window type. 6.3 The inspection report shall also include the following contents: 6.3.1 The manufacturer name, variety, model, specifications and dimensions of the test piece and related diagrams (the elevation and section of the whole window, the section of the profile and the section of the inlay strip, the section of the sealing strip, etc.).
6.3.2 The thickness, type and inlay method of the glass, the surface density and the openable area of ​​the window. 6.3.3 Whether there are sealing measures. If so, the material, section and installation method of the sealing strip shall be marked. 6.3.4 The model of the inspection instrument.
6.3.5 The name of the inspection unit, the inspection date and the seal. 6.3.6 The signatures of the inspector and the auditor. GB/T8485—2002
Appendix A
(Suggestive Appendix)
Grading table in GB8485—87 “Grading of airborne sound insulation performance of exterior windows of buildings and its test methods”Grading table in GB8485—87 “Grading of airborne sound insulation performance of exterior windows of buildings and its test methods” (see Table A1). Table A1
Range of weighted sound insulation Rw value (dB)
Rw≥45
45>Rw≥40
40>Rw≥35
35>Rw≥30
30>Rw≥25
25>Rw≥20
GB/T8485-2002
People's Republic of China
National Standard
Airborne sound insulation performance of building exterior windows
Classification and test methods
GB/T8485—2002
Published by China Standards Press
Sanlihebei Street outside Fuxingmen, Beijing No. 16
Postal code: 100045
Tel: 6852391668517548
Printed by China Standard Press Qinhuangdao Printing Factory Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Format 880×12301/16
Word count 12,000 words
Printing sheet 3/4
First edition in August 2002 First printing in August 2002 Print run 1-3000
Website bzcbs.com
Subject 613-331
Copyright exclusive Infringements must be investigated
Report telephone: (010) 685335333 Whether there are any sealing measures. If so, the material, cross section and installation method of the sealing strip should be marked. 6.3.4 Model of the testing instrument.
6.3.5 Name of the testing unit, test date and stamp. 6.3.6 Signatures of the testing personnel and auditors. GB/T8485—2002
Appendix A
(Suggested Appendix)
GB8485—87 "Classification of airborne sound insulation performance of building exterior windows and its test methods" Classification table in GB8485-87 "Classification of airborne sound insulation performance of building exterior windows and its test methods" (see Table A1). Table A1
Range of weighted sound insulation Rw value (dB)
Rw≥45
45>Rw≥40
40>Rw≥35
35>Rw≥30
30>Rw≥25
25>Rw≥20
GB/T8485-2002
People's Republic of China
National Standard
Airborne sound insulation performance of building exterior windows
Classification and test methods
GB/T8485—2002
Published by China Standards Press
Sanlihebei Street outside Fuxingmen, Beijing No. 16
Postal code: 100045
Tel: 6852391668517548
Printed by China Standard Press Qinhuangdao Printing Factory Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Format 880×12301/16
Word count 12,000 words
Printing sheet 3/4
First edition in August 2002 First printing in August 2002 Print run 1-3000
Website bzcbs.com
Subject 613-331
Copyright exclusive Infringements must be investigated
Report telephone: (010) 685335333 Whether there are any sealing measures. If so, the material, cross section and installation method of the sealing strip should be marked. 6.3.4 Model of the testing instrument.
6.3.5 Name of the testing unit, test date and stamp. 6.3.6 Signatures of the testing personnel and auditors. GB/T8485—2002
Appendix A
(Suggested Appendix)
GB8485—87 "Classification of airborne sound insulation performance of building exterior windows and its test methods" Classification table in GB8485-87 "Classification of airborne sound insulation performance of building exterior windows and its test methods" (see Table A1). Table A1
Range of weighted sound insulation Rw value (dB)
Rw≥45
45>Rw≥40
40>Rw≥35
35>Rw≥30
30>Rw≥25
25>Rw≥20
GB/T8485-2002
People's Republic of China
National Standard
Airborne sound insulation performance of building exterior windows
Classification and test methods
GB/T8485—2002
Published by China Standards Press
Sanlihebei Street outside Fuxingmen, Beijing No. 16
Postal code: 100045
Tel: 6852391668517548
Printed by China Standard Press Qinhuangdao Printing Factory Distributed by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Format 880×12301/16
Word count 12,000 words
Printing sheet 3/4
First edition in August 2002 First printing in August 2002 Print run 1-3000
Website bzcbs.com
Subject 613-331
Copyright exclusive Infringements must be investigated
Report telephone: (010) 68533533
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