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Basic data
| Standard ID | GB/T 13465.11-2025 (GB/T13465.11-2025) |
| Description (Translated English) | Test method of impermeable graphite materials - Part 11: Penetration coefficient |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | G94 |
| Classification of International Standard | 71.120 |
| Word Count Estimation | 10,114 |
| Date of Issue | 2025-08-29 |
| Date of Implementation | 2026-03-01 |
| Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
GB/T 13465.11-2025: Test method of impermeable graphite materials - Part 11: Penetration coefficient
---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/GBT13465.11-2025
ICS 71.120
CCSG94
National Standard of the People's Republic of China
Test methods for impermeable graphite materials
Part 11.Permeability coefficient
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
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.
This document is Part 11 of GB/T 13465.GB/T 13465 has been published in the following parts.
--- GB/T 13465.1 Test methods for impermeable graphite materials - Part 1.General;
--- GB/T 13465.2 Test methods for impermeable graphite materials - Part 2.Flexural strength;
--- GB/T 13465.3 Test methods for impermeable graphite materials - Part 3.Compressive strength;
--- GB/T 13465.4 Test methods for impermeable graphite materials - Part 4.Impact strength;
--- GB/T 13465.5 Test method for shrinkage of impermeable graphite phenolic adhesive;
--- GB/T 13465.6 Impermeable graphite tube hydraulic burst test method;
--- GB/T 13465.7 Test method for weight gain and pore filling rate of impermeable graphite;
--- GB/T 13465.8 Test method for bond shear strength of impermeable graphite adhesive;
--- GB/T 13465.9 Test method for tensile strength of impermeable graphite adhesive bonds;
--- GB/T 13465.10 Test methods for impermeable graphite materials - Part 10.Tensile strength;
--- GB/T 13465.11 Test methods for impermeable graphite materials - Part 11.Permeability coefficient;
--- GB/T 13465.12 Test methods for impermeable graphite materials - Part 12.Thermal conductivity.
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 the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment (SAC/TC162).
This document was drafted by. Nantong Shanjian Anticorrosion Technology Co., Ltd., Nantong Jingtong Graphite Equipment Co., Ltd., Jiangsu Special Equipment Safety
Supervision and Inspection Institute, Hangzhou Special Equipment Inspection Science Institute (Hangzhou Special Equipment Emergency Response Center), Nantong Planet Graphite Co., Ltd.
Co., Ltd., Nantong Sansheng Graphite Equipment Technology Co., Ltd., Ningbo Special Equipment Inspection and Research Institute, Guizhou Special Equipment Inspection and Research Institute
Institute of Testing and Measurement, Nantong Institute of Technology, Zhejiang Huarong Technology Co., Ltd., Shanghai Renpeng Industrial Co., Ltd., Pingdingshan Xinruida Graphite Manufacturing Co., Ltd.
Co., Ltd., Tianhua Chemical Machinery and Automation Research and Design Institute Co., Ltd.
The main drafters of this document are. Yao Songnian, Chen Hanming, Du Qing, Gu Jianping, Zhang Yi, Cai Yuanhang, Mo Weixian, Li Junning, Wen Fucong, Wang Xiaoliang,
Zhao Guihua, Zhou Zhiqiang, Wang Xihua, Zhao Dongdong, Yu Peng, Qiu Xiaofeng, Tian Feng, Qian Shengjie, Wang Lei, Yin Jing, Xiao Lijuan, He Zhengwen, and Sang Linchun.
introduction
GB/T 13465 "Test methods for impermeable graphite materials" aims to accurately measure the mechanical properties, permeability and
Transmission performance and thermal conductivity, it is planned to consist of 12 parts.
--- Part 1.General. The purpose is to provide the basic requirements and principles for the performance testing of impermeable graphite materials.
--- Part 2.Flexural Strength. The purpose is to provide a scientific, accurate and reliable test method for the flexural strength of impermeable graphite materials.
--- Part 3.Compressive Strength. The purpose is to provide a scientific, accurate and reliable test method for the compressive strength of impermeable graphite materials.
--- Part 4.Impact strength. The purpose is to provide a scientific, accurate and reliable test method for the impact strength of impermeable graphite materials.
--- Part 5.Phenolic adhesive shrinkage. The purpose is to provide scientific, accurate and reliable impermeable graphite phenolic adhesive shrinkage
Rate testing method.
--- Part 6.Graphite tube hydraulic bursting. The purpose is to provide a scientific, accurate and reliable test method for the hydraulic bursting performance of impermeable graphite tubes.
Test method.
--- Part 7.Weight gain and pore filling rate. The purpose is to provide scientific, accurate and reliable measurement of weight gain and pore filling rate of impermeable graphite.
Try method.
--- Part 8.Adhesive bond shear strength. The purpose is to provide scientific, accurate and reliable impermeable graphite adhesive bond shear strength.
Shear strength test method.
--- Part 9.Adhesive bond tensile strength. The purpose is to provide scientific, accurate and reliable impermeable graphite adhesive bond tensile strength.
Tensile strength test method.
--- Part 10.Tensile strength. The purpose is to provide a scientific, accurate and reliable test method for the tensile strength of impermeable graphite materials.
--- Part 11.Permeability coefficient. The purpose is to provide a scientific, accurate and reliable test method for the permeability coefficient of impermeable graphite materials.
--- Part 12.Thermal conductivity. The purpose is to provide a scientific, accurate and reliable test method for the thermal conductivity of impermeable graphite materials.
Permeability coefficient is one of the most important performance parameters of impermeable graphite materials. It is the key to the selection of impermeable graphite equipment materials and to ensure the safety of equipment.
A very important parameter for full operation, especially for impermeable graphite equipment that contains high-pressure and extremely hazardous media, the permeability coefficient is the most important
One of the most important safety evaluation indicators, accurate testing of the permeability coefficient of impermeable graphite materials is crucial to ensuring the pressure-bearing safety and reliability of impermeable graphite equipment.
It is of great significance to improve product quality.
Test methods for impermeable graphite materials
Part 11.Permeability coefficient
1 Scope
This document describes a test method for measuring the permeability of impermeable graphite materials by the vacuum decay method.
This document is applicable to the testing of non-contact materials with air as the test gas and a permeability coefficient of 1×10-6mm2/s~1mm2/s under natural environmental conditions.
Test of permeability coefficient of permeable graphite material.
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 to
This document.
GB/T 13465.1 Test methods for impermeable graphite materials Part 1.General
HG/T 2059 Technical Specifications for Impermeable Graphite Tubes
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
The amount of gas permeation per unit time and per unit area of an impermeable graphite tubular sample of a certain volume and length.
3.2
Vacuum decay method
The sealed container is vacuumed to a certain pressure value, and then placed in a natural environment for a set time. The sealed container is tested before and after standing.
The method for calculating the gas permeability coefficient of tubular specimens is based on the difference in pressure values inside the device.
4 Test Principle
The measurement is carried out using the vacuum decay method, that is, an impermeable graphite tubular sample is installed on the test device to form a closed container, and then the vacuum is
Empty the container to a certain pressure value, and then let it stand in a natural environment for a set time. The pressure difference between the closed container before and after standing is measured.
Calculate the permeability coefficient of impermeable graphite tubular specimen.
5.Test equipment and instruments
5.1 Test apparatus
5.1.1 Test device structure
The structure and components of the test device are shown in Figure 1.
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