GB/T 21332-2008 English PDF

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GB/T 21332-2008: Rigid cellular plastics -- Determination of water vapour transmission properties
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21332-2008	254	Add to Cart	3 days	Rigid cellular plastics -- Determination of water vapour transmission properties	Valid

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Basic data

Standard ID: GB/T 21332-2008 (GB/T21332-2008)
Description (Translated English): Rigid cellular plastics -- Determination of water vapour transmission properties
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G32
Classification of International Standard: 83.100
Word Count Estimation: 13,157
Date of Issue: 2008-01-04
Date of Implementation: 2008-09-01
Quoted Standard: GB/T 2918-1998; GB/T 6342-1996; ISO 483-2005
Adopted Standard: ISO 1663-1999, IDT
Regulation (derived from): China National Standard Approval Announcement2008 No.1 (Total No.114)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the water vapor transmission rate of rigid foam, water vapor permeability, Determination of resistance to water vapor diffusion coefficient and water vapor through the index. This standard applies to more than 10mm thick rigid foam. The material can be complete, since the junction layer may be adhered to the surface layer material or foam material.

GB/T 21332-2008: Rigid cellular plastics -- Determination of water vapour transmission properties

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Rigid cellular plastics. Determination of water vapour transmission properties ICS 83.100 G32 National Standards of People's Republic of China GB/T 21332-2008/ISO 1663.1999 Rigid Foam Determination of water vapor permeability (ISO 1663.1999, IDT) Posted 2008-01-04 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is equivalent to international standards ISO 1663.1999 "Determination of rigid foam water vapor transmission properties", the technical content Exactly the same as ISO 1663.1999, only a few editorial changes. Appendix A of this standard is a normative appendix, Appendix B is an informative annex. The standard proposed by China National Light Industry Council. This standard by the National Standardization Technical Committee of plastic products. This standard was drafted. Beijing Technology and Business University, Shandong Province Plastics Industry Testing Center, Shandong Institute of Product Quality Supervision and Inspection, the State Light plastic product quality supervision and inspection stations in Wuhan. The main drafters of this standard. Li Li, Wang, Xiao raised his eyebrows, Liu Lu Xing, Chen Qian, Zhou Caifen, Zhao Dong. GB/T 21332-2008/ISO 1663.1999 Rigid Foam Determination of water vapor permeability

1 Scope

This standard specifies the water vapor transmission rate of rigid foam, water vapor permeability, water vapor permeability coefficient and water vapor diffusion resistance means Determination of the number. This standard applies to a thickness of 10mm or more rigid foam. Material may be intact, from the junction layer may be adhered to the surface or Foam material. This standard specifies three different temperature and humidity conditions. a) 38 ℃, humidity gradient from 0% to 88%; b) 23 ℃, humidity gradient of 0% to 85%; c) 23 ℃, humidity gradient of 0% to 50%. The results obtained by this method can be used for product design, production control, and product specifications. This method is applicable to water vapor transmission rate at 3mg/(m2 · s) ~ 200mg/(m2 · s) within the scope of the material.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 2918-1998 standard plastic sample conditioning and environmental tests (idt ISO 291.1997) GB/T 6342-1996 foam rubber - Determination of linear dimensions (idt ISO 1923. 1981) ISO 483.2005 plastic water solution in a sealed container constant relative humidity value method

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 At a predetermined temperature and humidity conditions and thickness, mass of water vapor per unit time per unit area of \u200b\u200bthe sample to pass through. Micrograms per square M s [μg/(m 2 · s)] FIG. Note. The water vapor transmission rate of the measured result is that the thickness of the sample under specific. 3.2 During the test, the sample vapor propagation velocity and the ratio between the upper and lower surfaces of the vapor pressure of the sample during the test. Nanograms per use M2 x s Pascal [ng/(m2 · s · Pa)] FIG. Note. The results of the water vapor transmission rate is measured by the thickness of the sample under specific. 3.3 Water vapor transmission rate of the countdown. 3.4 The water vapor permeability and thickness of the product. GB/T 21332-2008/ISO 1663.1999 ......

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