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Thermal-insulating materials - Determination of long-term water absorption by diffusion
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Basic data
| Standard ID | GB/T 44440-2024 (GB/T44440-2024) |
| Description (Translated English) | Thermal-insulating materials - Determination of long-term water absorption by diffusion |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G31 |
| Classification of International Standard | 83.100 |
| Word Count Estimation | 12,156 |
| Date of Issue | 2024-08-23 |
| Date of Implementation | 2024-08-23 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44440-2024: Thermal-insulating materials - Determination of long-term water absorption by diffusion
---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.
Thermal-insulating materials - Determination of long-term water absorption by diffusion
Determination of long-term water absorption rate of thermal insulation materials by diffusion method
Thermal-insulating materials-Determination of long-term
water absorption by diffusion
(ISO 20393.2007, IDT)
ICS 83.100
CCS G31
National Standard of the People's Republic of China
Released on 2024-08-23
2025-03-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface ... Ⅲ
1 Scope ... 1
2 Normative references ... 1
3 Terms and Definitions ... 1
4 Principle ... 1
5 Instruments and Materials ... 1
6 Samples ... 2
6.1 Dimensions ... 2
6.2 Number of samples ... 2
6.3 Sample preparation ... 2
6.4 State Adjustment ... 2
7 Test steps ... 3
8 Results ... 3
9 Precision ... 3
10 Test Report ... 3
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is equivalent to ISO 20393.2007 "Determination of long-term water absorption of thermal insulation materials by diffusion method".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by China Light Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products (SAC/TC 48).
This document was drafted by. Beijing Technology and Business University, Jiangsu Jianghua Polyurethane Product Quality Inspection Co., Ltd., Jiangsu Chemical Research Institute Co., Ltd.
Company, Jiangsu Lvyuan New Materials Co., Ltd., Jiangsu Zhongsheng Pipeline Engineering Technology Co., Ltd., Light Industry Plastic Processing Application Research Institute, Jiangsu
Shengtai Energy Saving Technology Co., Ltd., Nantong Mishuifang Sleep Industry Technology Co., Ltd., Hebei Junye Technology Co., Ltd., Gansu Zhongqingqing
Industrial Product Quality Inspection and Testing Co., Ltd. and Beijing Huancheng Technology Co., Ltd.
The main drafters of this document are. Wang Lei, Luo Chen, Wu Hao, Bai Yu, Zhang Ruyi, Ni Xinxing, Cui Aihua, Zhang Wanwei, Shen Chuanxi,
Yang Bingfeng, Yu Yanzang, Lian Qin, Song Junlong.
Determination of long-term water absorption rate of thermal insulation materials by diffusion method
1 Scope
This document specifies the equipment and method for determining the long-term water absorption of thermal insulation materials by the diffusion method.
The water absorption capacity of materials. These materials not only withstand close to 100% relative humidity on both sides for a long time during use, but also have
Water vapour pressure gradients, such as on pitched roofs or unprotected floor insulation.
This document applies to some insulation materials, but not all types of insulation materials. Product standards for insulation materials should usually state
This document may apply to specific products.
NOTE. For floor insulation, lower temperatures may be used instead of the 50°C test temperature currently specified in this document when more data become available.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies.
in this document.
ISO 472 Plastics-Vocabulary
Note. GB/T 2035-2008 Plastics terms and definitions (ISO 472.1999, IDT)
ISO 1923 Cellular plastics and rubbers - Determination of linear dimensions
linear dimensions
Note. GB/T 6342-1996 Determination of linear dimensions of cellular plastics and rubber (ISO 1923.1981)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 apply.
4 Principle
The diffusion method for determining long-term water absorption is to subject the sample to a specific water vapor pressure difference and temperature gradient between its upper and lower surfaces over a period of 28 days.
The degree is then determined by measuring the mass increase of the sample.
5.Instruments and Materials
5.1 Balance. precision 0.1 g.
5.2 Corrosion-resistant container. with a frame capable of supporting the specimen.
5.3 Heating device. Equipped with a thermostat that can control the water temperature at (50±1)℃.
5.4 Cooling plate. The outside must be insulated and operate at a working temperature of (1±0.5)℃.
5.5 Tap water. temperature maintained at (50±1)℃.
5.6 Test apparatus. The basic principle of the test apparatus is shown in Figure 1.
...
