GB/T 17794-2021 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 17794-2021 | English | 230 |
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Preformed flexible elastomeric foam thermal insulation
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| GB/T 17794-2008 | English | 105 |
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Preformed flexible elastomeric cellular thermal insulation
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| GB/T 17794-1999 | English | 519 |
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Preformed flexible elastomeric cellular thermal insulation
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GB/T 17794-2021: Preformed flexible elastomeric foam thermal insulation---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT17794-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.10
CCS Q 25
Replace GB/T 17794-2008
Preformed flexible elastomeric foam thermal insulation
Issued on. AUGUST 20, 2021
Implemented on. MARCH 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and Definitions... 6
4 Classification and marking... 6
5 Requirements... 7
6 Test methods... 9
7 Inspection rules... 13
8 Logos, labels, and operating instructions... 14
9 Packaging, transportation, and storage... 15
Appendix A (Normative) Measuring methods for the dimensions and volumes of pipes
... 16
Appendix B (Normative) Determination method for vacuum volume water absorption
... 18
Foreword
This standard is drafted in accordance with the provisions of GB/T 1.1-2020 “Directives
for standardization - Part 1.Rules for the structure and drafting of standardizing
documents”.
This standard replaces GB/T 17794-2008 “Preformed flexible elastomeric cellular
thermal insulation”. Compared with GB/T 17794-2008, except for structural adjustment
and editorial changes, the main changes are as follows.
a) The service temperature range is modified (see Chapter 1; see Chapter 1 of the
2008 edition);
b) The definition of “preformed flexible elastomeric foam thermal insulation” is
modified (see 3.1; see 3.1 of the 2008 edition);
c) The classification according to the service temperature is added (see 4.1.1);
d) The classification by combustion performance is deleted (see 4.1.1 of the 2008
edition);
e) The appearance quality requirements are modified (see 5.1; see 5.2 of the 2008
edition);
f) The specification and dimensional deviation requirements are modified (see 5.2;
see 5.1 of the 2008 edition);
g) The physical performance requirements are modified (see Table 3; see Table 3 of
the 2008 edition);
h) The requirements for combustion performance are modified (see 5.4; see Table 3
of the 2008 edition);
i) Special requirements are added (see 5.5);
j) The test method is modified (see Chapter 6; see Chapter 6 of the 2008 edition);
k) Appendix B is modified (see Appendix B; see Appendix C of the 2008 edition);
l) Appendix B and Appendix D of the 2008 edition are deleted.
Please note that some of the contents of this document may involve patents. The issuing
agency of this document is not responsible for identifying patents.
This document is proposed by China Building Materials Federation.
This document shall be under the jurisdiction of the Technical Committee on Thermal
Insulation Materials of Standardization Administration of China (SAC/TC191).
Drafting organizations of this document. Technical Supervision and Research Center of
the Building Materials Industry, Huamei Energy-saving Technology Group Co., Ltd.,
Armacell (Guangzhou) Limited, China Building Material Test and Certification Group
Co., Ltd., Shanghai Jianke Technical Assessment of Construction Co., Ltd., Wincell
Insulation Group, Shenzhou Energy Saving Technology Group Co., Ltd., Hebei Jinwei
New Building Materials Co., Ltd., Huanengzhongtian Energy Efflciency Technology
Group Co., Ltd., Owens Corning (China) Investment Co., Ltd., L’isolante K-Flex
(Suzhou) Co., Ltd., Durkee (Wuhan) Thermal Insulation Material Co., Ltd., Aeroflex
Polymer Technologies (Shanghai) Co., Ltd., Hebei OMEFLEX Thermal Insulation
Material Co.,Ltd., Hubei Hengxiang Technology Co., Ltd., Tianchang Jinfulaisi
Thermal Insulation Materials Co., Ltd., Cangzhou Huayang Refractory and Heat
Preservation Materials Co., Ltd., Langfang Qiyuan Thermal Insulation Materials Co.,
Ltd., Guangdong Yulong High-tech Materials Co., Ltd., Blessed Thermal Insulation
Industrial Cluster Co., Ltd., Hebei Gome New Type Building Material Co., Ltd.,
Zhejiang Jiaolian Radiation Materials Co., Ltd., Hubei Xiangyuan New Material
Technology Co., Ltd.
The main drafters of this document. Jin Fujin, Liu Yingzhuo, Sui Chengxin, Hao Yunan,
Yang Weibo, Xu Ying, Su Jun, Gao Hechang, Song Lingzhen, Gao Hongquan, Ma
Xuran, Zhang Jianqiang, Fang Yidong, Zhang Jun, Xie Cunjian, Gao Tieyan, Gao
Weimin, Gao Yongtao, Gao Zhengwei, Zhu Fusen, Zhang Zhi, Wei Guanghong, Jin
Haifeng, Li Mei, Chen Ming, Li Chao, Kang Ming, He Pengchong, Hu Gangquan, Li
Yue, Xing Jiangtao, Liu Jianghong, Gao Shiyi, Li Xinfeng, Wei Qiong, Gao Yangyang.
The previous versions of this document and its replaced documents are as follows.
--- This document was first published in 1999 and revised for the first time in 2008;
this is the second revision.
Preformed flexible elastomeric foam thermal insulation
1 Scope
This document specifies the classification and marking, requirements, test methods,
inspection rules, logos, labels, operating instructions, packaging, transportation, and
storage of flexible elastomeric foam thermal insulation products.
This document is applicable to flexible elastomeric foam products for thermal
insulation with a service temperature of -196 ℃~175 ℃. This document is also
applicable to flexible elastomeric foam products with veneer.
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB/T 2406.2 Plastics - Determination of burning behaviour by oxygen index - Part
2.Ambient-temperature test
GB/T 2918 Plastics - Standard atmospheres for conditioning and testing
GB/T 4132 Definitions of terms relating to thermal insulating materials
GB/T 6342 Cellular plastics and rubbers - Determination of linear dimensions
GB/T 6343 Cellular plastics and rubbers - Determination of apparent density
GB/T 6669-2008 Flexible cellular polymeric materials - Determination of
compression set
GB 8624 Classification for burning behavior of building materials and products
GB/T 8627 Test method for density of smoke from the burning or decomposition of
building materials
GB/T 8811 Test method for dimensional stability of rigid cellular plastics
3 Terms and Definitions
The terms and definitions defined in GB/T 4132 and the following terms and definitions
apply to this document.
3.1 preformed flexible elastomeric foam thermal insulation; FEF
A flexible thermal insulation product with a closed-cell structure, which is based on
natural or synthetic rubber and contains other polymers or chemicals, and is modified
by organic or inorganic additives and processed by mixing, extrusion, foaming, cooling
and shaping.
4 Classification and marking
4.1 Classification
4.1.1 According to the service temperature range of products, they are divided into.
4.1.2 According to the shapes of products, they are divided into boards (represented by
B) and pipes (represented by G).
4.2 Marking of products
The order of marking is as follows. product name, type, shape, width (inner diameter)
× thickness (wall thickness) × length, veneer material, and this document number.
5 Requirements
5.1 Appearance quality
Except for the section cut by the factory machinery, the surface shall have natural skin.
The surface of the product shall be flat, allowing fine and uniform folds, but there shall
be no obvious defects such as blisters, cracks, and damage that affect the use.
5.2 Dimensions and allowable deviations
5.4 Combustion performance
5.4.1 The oxygen index of CY-type products shall not be less than 32%, the oxygen
index of DW-type and GW-type products shall not be less than 30%; the smoke density
grade shall not be greater than 75.
5.5 Special requirements
5.5.1 Release of TVOC
When used indoors and there are environmental requirements, it shall not be greater
than 0.50 mg/(m2 • h).
5.5.2 Anti-aging properties
When the products are used outdoors, the anti-aging performance test shall be carried
out, and the test time shall be negotiated by both parties. After the test, the surface of
the sample shall be free of cracks, pinholes, and obvious deformation, but slight
wrinkling is allowed.
6 Test methods
6.1 Conditioning
The test environment and the conditioning of the specimen shall be in accordance with
the provisions of GB/T 2918.The temperature shall be (23±2) °C, the relative humidity
shall be (50±10) %, and the time of conditioning shall be not less than 24 h.
6.2 Specimen preparation
Specimens shall be prepared in as-supplied state. When a product is not suitable for the
test or preparation of a specimen due to its shape, it shall be replaced by a board
produced through the same formula, the same process and at the same time, and having
the same density (the apparent density deviation shall be ±5 kg/m3).
6.5 Apparent density
The determination shall be carried out in accordance with the provisions of GB/T 6343.
The determination of the volume of the pipe shall be carried out according to the
provisions of Appendix A.
6.8 Moisture permeability coefficient and moisture resistance factor
The determination of the moisture permeability of the board shall be carried out
according to the desiccant method in GB/T 17146, and the determination and
calculation of the moisture permeability of the pipe shall be carried out according to the
provisions of GB/T 34005.
6.10 Temperature resistance
6.10.1 Dimensional change rate
6.10.1.1 Carry out the determination according to the provisions of GB/T 8811, and test
3 specimens for each sample. The length of the tubular specimen shall be (100±2) mm,
and measure the dimensions of the inner diameter and wall thickness of the product
according to Appendix A.
6.10.3 Maximum service temperature
The determination of GW-type products shall be carried out in accordance with the
provisions of GB/T 17430.The temperature of the hot plate shall be agreed upon by the
supplier and the buyer or offered by the manufacturer, but shall not be lower than 150 °C.
6.11 Combustion performance
6.12 Release of TVOC
The determination shall be carried out according to the provisions of GB/T 29899; use
a 1 m3 small release chamber; the temperature shall be (23±0.5) ℃, the relative
humidity shall be (50±3) %, the product load rate shall be 1, and the air exchange rate
shall be 1 time per hour.
6.13 Anti-aging properties
Carry out the determination according to the provisions of GB/T 16422.2.Test
conditions. The irradiance shall be 550 W/m2, and the black mark temperature shall be
(65±3) °C; in the test chamber, the temperature shall be (38±3) °C, the relative humidity
shall be (50±5) %, and no rainfall is required. Specimen dimensions. the board product
shall be (150±2) mm × (75±1) mm × the original thickness, and the tubular product
shall be length (100±2) mm × the original inner diameter × the original wall thickness.
7 Inspection rules
7.1 Factory inspection and type inspection
7.1.1 Factory inspection
The inspection items of the factory inspection include the dimensions and allowable
deviations, appearance quality, apparent density, vacuum volume water absorption, and
compression rebound rate.
7.2 Batching and sampling
7.2.1 Batching
Group the products with the same raw material formula, the same production process,
the same variety, and of stable and continuous production together into an inspection
batch.
7.2.2 Sampling
7.2.2.1 Secondary sampling is adopted for the inspection of the appearance and
dimensions, and the sampling plan is shown in Table 4, in which the batch size and the
number of samples refer to the number of pieces of boards or pipes. The samples shall
be randomly selected from the inspection batch, and the samples shall be able to
represent the average quality of the batch.
7.3 Judgment rules
7.3.1 All properties shall be regarded as independent and judged by the rounded values
of the determination results.
7.3.2 Judgment of appearance and dimensions shall be in accordance with the
provisions of Table 4.
8 Logos, labels, and operating instructions
The following contents shall be indicated on the packaging boxes, labels, and in the
Number of defects of thickness (wall thickness) and inner diameterBatch size Other defects
9 Packaging, transportation, and storage
Products shall be stacked according to categories and specifications to avoid pressure,
and the warehouse shall be kept dry and ventilated. Products shall be packed in plastic
bags or cartons. During transportation and storage, keep them away from heat sources,
and avoid sunlight, rain, long-term pressure, and other mechanical damage.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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