GB/T 30801-2014 English PDF (GBT30801-2014)

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GB/T 30801-2014: Hygrothermal performance of building materials and products -- Determination of water-vapour transmission properties -- Box method
GB/T 30801-2014
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.10
Q 25
GB/T 30801-2014/ISO 21129.2007
Hygrothermal performance of building materials and
products - Determination of water-vapour
transmission properties - Box method
(ISO 21129.2007, IDT)
ISSUED ON. JUNE 24, 2014
IMPLEMENTED ON. FEBRUARY 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms, definitions, symbols and units ... 4 
4 Principle... 6 
5 Apparatus ... 6 
6 Test specimen ... 8 
7 Procedure ... 8 
8 Calculation and expression of results ... 10 
9 Measurement accuracy ... 11 
10 Test report ... 11 
Annex A ... 13 
Annex B ... 15 
Annex C ... 16 
Bibliography ... 18 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard uses translation method to make it identical with ISO 21129.2007
Hygrothermal performance of building materials and products - Determination
of water-vapour transmission properties - Box method. There are following
editorial changes between this Standard and ISO 21129.2007.
- modified “this International Standard” to “this Standard”;
- added table title of Table 1; modified Table 1 in the ISO standard to Table
2;
- added GB/T 20312-2006 and ISO 12572.2001 in Bibliography to Clause
2.
This Standard was proposed by China Building Materials Federation.
This Standard shall be under the jurisdiction of National Technical Committee
on Insulation Material of Standardization Administration of China (SAC/TC 191).
The drafting organizations of this Standard. Nanjing Glass Fiber Research and
Design Institute Co., Ltd., National Glass Fiber Products Quality Supervision
and Inspection Center.
Main drafters of this Standard. Zhang You, Wang Jiaqing, Ge Dunshi, Cui Jun,
Zhang Jianhong, Chen Lihua, Tang Jian, Jiang Pengfei, Yang Chao.
Hygrothermal performance of building materials and
products - Determination of water-vapour
transmission properties - Box method
1 Scope
This Standard specifies a box method for determining the water-vapour
permeability of building materials. The box method is used primarily to measure
the water-vapour permeance of materials that have low water-vapour
resistance, in which the influence of the surface-humidity transmission-
resistance cannot be ignored.
NOTE Materials with low water-vapour resistance includes those with no greater than 1.8
× 109 • m2 • S • Pa/kg of resistance [water vapour permeability coefficient of 5.5 × 10−8
kg/(m2 • S • Pa or above)].
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
ISO 9346 Hygrothermal performance of buildings and building materials -
Mass transfer - Physical quantities and definitions
GB/T 20312-2006 Hygrothermal performance of building materials and
products - Determination of hygroscopic sorption properties (ISO
12571.2000, IDT)
ISO 12572.2001 Hygrothermal performance of building materials and
products Determination of water vapour transmission properties
3 Terms, definitions, symbols and units
3.1 Terms and definitions
For the purposes of this document, the definitions given in ISO 9346 and the
following apply.