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GB/T 25998-2010 English PDF (GBT25998-2010)

GB/T 25998-2010 English PDF (GBT25998-2010)

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GB/T 25998-2010: Mineral wool decorating and acoustic ceilings
This standard specifies the classification and marking, requirements, test methods, inspection rules, marks and labels, packaging, transportation and storage of mineral wool decorating and acoustic ceilings.
GB/T 25998-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.060.30
Q25
Mineral Wool Decorating and Acoustic Ceilings
矿物棉装饰吸声板
ISSUED ON. JANUARY 10, 2011
IMPLEMENTED ON. OCTOBER 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Classification and Marking ... 6
5 Requirements ... 7
6 Test Methods ... 9
7 Inspection Rules ... 10
8 Marks and Labels ... 13
9 Packaging, Transportation and Storage ... 14
Appendix A ... 15
Appendix B ... 17
Appendix C ... 18
Appendix D ... 21
Appendix E ... 22
Foreword
This standard is drafted in accordance with the regulations of GB/T 1.1- 2009. This standard is not equivalent to JIS A 6301-2007 "Sound-absorbing Materials" on the contents of rock wool decorating and acoustic ceilings.
Please note that some contents of this standard may involve patents; the issuing organization of this standard shall not undertake the responsibility of identifying these patents.
This standard was proposed by the China Building Materials Federation.
This standard shall be under the jurisdiction of the National Technical Committee on Insulation Materials of Standardization Administration of China (SAC/TC 191). Responsible drafting organizations of this standard. Nanjing Fiberglass R and D Institute, Beijing New Building Materials Public Limited Company, Beiyang Building Materials Co., Ltd., Star–USG Building Materials Company, Ltd., Shanghai A'musizhuang Building Products Co., Ltd.
Participating drafting organization of this standard. Shandong HLK New Material Science and Technology Co., Ltd.
Chief drafting staffs of this standard. Wang Jiaqing, Chen Shang, Wu Fade, Teng Weiguang, Zhang Hanqing, Zhang Lianxu, Zhang Jian, Zhu Hengbin, Zhang You and Chen Lihua.
Mineral Wool Decorating and Acoustic Ceilings
1 Scope
This standard specifies the classification and marking, requirements, test methods, inspection rules, marks and labels, packaging, transportation and storage of mineral wool decorating and acoustic ceilings (hereinafter referred to as "acoustic ceilings"). This standard is applicable to the mineral wool decorating and acoustic ceilings produced by the wet-process method or dry-process method.
2 Normative References
The following documents are indispensable for the application of this standard. For dated references, only the dated edition is applicable to this document. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 3947 Acoustical Terminology
GB/T 4132 Definitions of Terms Relating to Thermal Insulating Materials GB/T 5480 Test Methods for Mineral Wool and its Products
GB 6566 Limit of Radionuclides in Building Materials
GB 8624-1997 Classification for Burning Behavior of Building Materials and Products
GB/T 10294 Thermal Insulation - Determination of Steady-state Thermal
Resistance and Related Properties - Guarded Hot Plate Apparatus
GB/T 10295 Thermal Insulation-Determination of Steady-state Thermal Resistance and Related Properties - Heat Flow Meter Apparatus
GB/T 17657-1999 Test Methods of Evaluating the Properties of Wood-based Panels and Surface Decorated Wood-based Panels
GB 18580 Indoor Decorating and Refurbishing Materials - Limit of Formaldehyde Emission of Woodbased Panels and Finishing Products
GB/T 18696.1 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1. Method using standing wave ratio GB/T 18696.2 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 2. Transfer function method
GB/T 20247 Acoustics - Measurement of sound absorption in a reverberation room GB/T 20313 Hygrothermal performance of building materials and products - Determination of moisture content by drying at elevated temperature
HJ/T 206 Technical requirement for environmental labeling products - Asbestos free building materials
3 Terms and Definitions
For the purposes of this document, the terms and definitions in GB/T 3947 and GB/T 4132 AND the following ones apply.
3.1
Mineral wool decorating and acoustic ceilings
The decorating and acoustic ceilings materials that use mineral wool, rock wool and glass wool as the major raw materials through wet-process or dry-process method. 3.2
Wet-process ceilings
The mineral wool decorating and acoustic ceilings that are made by the wet-process method such as slurrying, forming, drying and post-processing.
3.3
Dry-process ceilings
The mineral wool decorating and acoustic ceilings that are made of mineral (rock) wool ceilings or glass wool ceilings as the base materials.
3.4
Nominal size
It is a general term of the size of product specification.
3.5
Actual size
Table 5
Type
Noise reduction coefficient (NRC)
Reverberant room method
(rigid wall)
Impedance pipe method
(rear-cavity. 50mm)
Wet-process ceilings
Knurling ≥0.50 ≥0.25
Others ≥0.30 ≥0.15
Dry-process ceilings ≥0.60 ≥0.30
5.8 Damping deflection
The damping deflection of wet-process ceilings shall not be greater than 3.5mm while the damping deflection of dry-process ceilings shall not be greater than 1.0mm. 5.9 Radionuclide limit
It shall reach the requirements of Category A finishing materials specified in GB 6566, namely the internal exposure index IRa shall not be greater than 1.0 and the external exposure index Ir shall not be greater than 1.3.
5.10 Formaldehyde emission
It shall reach the requirements of Grade E1 specified in GB 18580, namely the formaldehyde emission shall not be greater than 1.5 mg/L.
5.11 Asbestos phase
There shall be no asbestos fiber in acoustic ceilings.
6 Test Methods
6.1 Appearance, size and volume density
In accordance with Appendix A.
6.2 Right angle deviation
In accordance with Appendix B.
6.3 Mass moisture percentage
It shall be in accordance with GB/T 20313. The specimen shall be cut according to the requirements of GB 5480; the size shall be 150 mm×150, the thickness shall be the product thickness, specimen quantity is 3, and the drying temperature is (105±5)°C. 6.4 Bending failure load
In accordance with Appendix C.
6.5 Thermal resistance
The thermal resistance shall be tested according to the requirements of GB/T 10294 or GB/T 10295; the arbitration test method is specified in GB/T 10294. Test thickness of thermal resistance shall be the measured thickness of the specimen.
6.6 Combustion performance
In accordance with the requirements of GB 8624-1997.
6.7 Noise reduction coefficient
In accordance with GB/T 18696.1, GB/T 18696.2 or GB/T 20247.
6.8 Damping deflection
In accordance with Appendix D. The test temperature is (40±2)°C, the relative test humidity is the marked RH value of the product and shall not be less than RH 70, and the precision is ±3%;as for the products for which the RH values are not marked, the test temperature is (40±2)°C and relative humidity is (70±3)%.
6.9 Radionuclide limit
In accordance with GB 6566.
6.10 Formaldehyde emission
It shall be carried out in accordance with the 9 ~ 11L dryer method specified in 4.12 of GB/T 17657-1999.
6.11 Asbestos phase
In accordance with HJ/T 206.
7 Inspection Rules
7.1 Exit-factory inspection
Exit-factory inspection refers to each test that must be carried out when the product is delivered. The inspection items include. appearance, size, volume density, right angle deviation, mass moisture percentage and bending failure load.
7.2 Type inspection
The type inspection refers to all inspection on the technical requirements specified in the standard to assess the product quality.
7.2.1 The type inspection shall be carried out under one of the following conditions. a) The trial manufacture and type identification of new products or old products produced by new plant;
b) After formal production, there is major change on the raw materials and production process which may affect the product performance;
c) Type inspection is carried out at least once every year on regular production; d) When the production resumes after the production halts for 6 months; e) Significant difference exists between exit-factory inspection results and the last type inspection results;
f) When the state quality supervision agency requires...
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